Geomorphology
sayyad asghari; Elnaz Piroozi
Abstract
The danger of earthquakes causes irreparable damage to societies. Therefore, it is effective to prepare to deal with it by identifying vulnerable points. Ardabil City is not exempt from this rule due to the existence of many faults, seismic points, and non-compliance with standards. Based on this, the ...
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The danger of earthquakes causes irreparable damage to societies. Therefore, it is effective to prepare to deal with it by identifying vulnerable points. Ardabil City is not exempt from this rule due to the existence of many faults, seismic points, and non-compliance with standards. Based on this, the current research seeks to measure and evaluate the vulnerability of Ardabil City against the risk of earthquakes. For this purpose, first by examining research sources related to the subject, some of the most important factors affecting the occurrence of this phenomenon were prepared as independent variables. Valuation and standardization of the layers were done by using the fuzzy membership function and weighting of the criteria, using the CRITIC method. Finally, modeling was done using the MARCOS multi-criteria decision-making method. The results of the study showed, respectively; The factors of distance from the fault, land use, and distance from the earthquake center have the greatest influence on the occurrence of earthquakes in the region with the weight coefficient of 0.110, 0.104, and 0.102. In addition, according to the results of the research, 16.67% of the entire city of Ardabil has a high vulnerability potential and 30.27% has a relatively high vulnerability probability. Also, based on the results of the research, Ardabil city is at an average level in terms of the level of vulnerability to earthquake risk, the cities of Hir and Arallo are in the high vulnerability category and Somarin city is in the relatively high vulnerability zone. In addition, according to the findings of the research, 22.86 and 30.86 percent of the settlements and villages of Ardabil, respectively; In the area with high and relatively high vulnerability, 13.14% in the area with moderate vulnerability, and respectively; 22.28 and 10.86% are located in the area with relatively low and low earthquake vulnerability.
Urban Planning
shahrivar rostaei; Firouz Jafari; Rogayeh Aliyoun
Abstract
Population growth and urbanization have reduced the per capita access to many social and economic facilities and its consequences have been manifested in a decrease in the quality of life in various urban areas.Tabriz metropolis, like most major cities in the country, is the bedrock of spatial inefficiency ...
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Population growth and urbanization have reduced the per capita access to many social and economic facilities and its consequences have been manifested in a decrease in the quality of life in various urban areas.Tabriz metropolis, like most major cities in the country, is the bedrock of spatial inefficiency in the regions to benefit from public urban services, especially educational services. The need to pay attention to educational use as the most basic urban public services is very important due to the youth of our country. This research has analyzed the distribution of educational centers in Tabriz, especially girls' schools in the first and second secondary school, from the point of view of spatial justice. The research method is descriptive-analytical. In order to achieve the research objectives, GIS software has been used to determine the operating radius of these units and the per capita of these units has been calculated and compared with the standard per capita and the amount of shortage or surplus of these services has been determined. In order to rank these schools, indicators have been determined and these indicators have been weighed using the Topsis technique. Finally, the schools have been ranked from excellent to very poor in terms of the desired indicators and have shown their distribution in the city of Tabriz Has been. The result is that the largest number of schools are ranked as poor schools and only 7 schools are excellent according to the desired indicators, which are located in areas 1 and 3.The urban management of Tabriz metropolis needs to pay attention to areas deprived of the educational services index.
GIS&RS
maryam Ebrahimian najafabadi; Alireza Ildoromi; samar mortazavi; Ebrahim Mohammadi Manesh
Abstract
Today, one of the most important environmental problems around the world, especially in aquatic ecosystems, is heavy metals pollution. since sediments are the main source of heavy metals, in this study, Gamasiab River sediments were evaluated for heavy metal contamination of chromium, copper, nickel, ...
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Today, one of the most important environmental problems around the world, especially in aquatic ecosystems, is heavy metals pollution. since sediments are the main source of heavy metals, in this study, Gamasiab River sediments were evaluated for heavy metal contamination of chromium, copper, nickel, zinc, iron and manganese. After layering, the results were interpolated by two methods of kriging and Inverse Distance. Moller Index, Ecological risk Index and numerical parameters were used to assess the range of sediment pollution. Results of Moller index in spring showed no pollution. Also, in summer it represented no pollution for all metals except Ni. Results of RI categorized level of Heavy metal concentration in low contamination. Using RI plans, zoning plans and Hot Spot analysis indicated that the concentration of heavy metals in the east of Gamasiab river in spring is higher than summer and it is shown that spots with high concentration in summer are located in the west of Gamasiab river.
GIS&RS
Akbar Asghari Zamani; Khalil Valizadeh Kamran; Robab Rahmani
Abstract
IntroductionVarious physical, semantic and functional factors in the role of the city as a bed to meet the needs and a container for the activities and behaviors of residents are effective, among which the structure and visual values of the environment play an important role in improving the quality ...
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IntroductionVarious physical, semantic and functional factors in the role of the city as a bed to meet the needs and a container for the activities and behaviors of residents are effective, among which the structure and visual values of the environment play an important role in improving the quality of urban space (Hosseini and Et al., 1390: 84). Among these, one of the urban elements that can play an important role in promoting the quality and visual values of the environment and the appearance of the city is the sky line. The skyline is one of the most influential factors in arranging urban spaces and planning appropriate urban environments, etc. A factor that is rarely seen in metropolitan areas today. It seems that in order to have a diverse and at the same time harmonious urban skyline, in the first place, it is necessary to reconnect the fields of philosophy, art and daily life, which are free from the abstract and abstract view of experts. The development of interdisciplinary professions such as GIS, architecture and urban design is one of the measures in this direction that can have a different and more accurate view of the urban skyline. Therefore, the need for advanced geographical models for spatial three-dimensionalization and decision-making and forecasting goals in urban planning and design, especially in the case of vertical evaluation and development, is very clear and necessary. The advantages of using three-dimensional GIS models can be high potential in urban evaluation and analysis in various dimensions of urban aesthetics and high technology in the field of spatial analysis, the ability to test urban proposals and the power of semantic and topological storage. Mentioned above. Therefore, the use of these softwares to analyze urban issues is very important and increases the accuracy of urban planners and managers. For this purpose, the present study seeks to investigate the status of the urban skyline in the study areas and based on this, the importance of the perceptual and managerial dimension of the issue is analyzed using new methods and techniques.Data and Method The analytical approach of the research is physical and the method used in this research is three-dimensional vision analysis. Also, Arc GIS software has been used for easy preparation of the environment in 3D to perform the required analyzes. The data set used includes: digital model data of elevation, surface and floor layers of urban blocks.Results and Discussion In the present study, the concept of skyline was analyzed using three-dimensional GIS analysis in areas of urban areas 1 and 5 located in the east and northeast of Tabriz. Areas of interest include Valiasr town and Rushdieh town. So far, many different methods have been proposed to display and analyze the skyline. Some of these methods were reviewed in the research background and their strengths and weaknesses were identified. But the purpose of this article was to investigate the capabilities of 3D analysis and modeling through the development of 3D GIS in skyline display and analysis. Evaluating the results obtained in this research and comparing it with the results of studies in this field shows that three-dimensional analysis of GIS and 3D GIS development in comparison with other methods, provided there is accurate and comprehensive information, has high efficiency and capability. The research hypothesis is confirmed.ConclusionThe skyline is important both in terms of urban architecture and in terms of urban planners and designers; Although these specialties are different in terms of information extraction methods, methods and analytical contexts, but they are quite similar in terms of results. In general, it can be said that the skyline is one of the analyzes that are analyzed and evaluated in different software environments such as Arc GIS and in different fields.But the results of this study proved in another way that the three-dimensional GIS environment provides an opportunity to easily view and analyze the level of impact, effectiveness, volume, dimensions and angles of the skyline; This software also has high analytical power. While the analysis of the sky line in a two-dimensional environment gives a graphical and dimensionless result, percentage and frequency. But the most important difference and the ability to use 3D GIS analysis is that it provides a platform where even people with little knowledge of urban views can easily see the results and make decisions based on it. Also, the capabilities and capabilities of GIS in the field of various valuations and combined analyzes of vector and raster functions, as well as the presentation of three-dimensional analysis, have led its applications to urban design.
Land use Planning
Rahimeh Rostami; Ali Mohammadkhorshidduost
Abstract
Introduction One of the physical factors in the development of Maragheh is the change of utilities and their conversion into residential use, which in turn have a direct impact on the process of physical development. The city of Maragheh is one of the most important cities in East Azerbaijan province, ...
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Introduction One of the physical factors in the development of Maragheh is the change of utilities and their conversion into residential use, which in turn have a direct impact on the process of physical development. The city of Maragheh is one of the most important cities in East Azerbaijan province, which has no exception to the rule of physical development. In this research, the characteristics of the city development process are examined physically. Statistics show the growing population in the city of Maragheh during the years 1966 to 2011. Understanding the factors affecting the physical expansion and development of cities helps understand urban growth and development trends. The study clarifies the factors that cause horizontal and physical growth of cities and, conversely, the repulsive factor of other parts of the city that are left behind by physical growth for any reason, and this explains the need for this research. The causes of urban growth are exactly the same as the origins of urban sprawl. In many cases, no distinction can be made between urban growth and urban sprawl however, it is important to have a clear understanding of the difference between urban sprawl and urban growth. The most imperative problems that have arisen from the uncontrolled growth of city due to physical development are the excessive use of land, the lack of sufficient urban facilities and equipment, the disconnection of the suburbs and thus adding to the urban problems. The purpose of this study is to study environmental and physical factors and their impact on the physical growth and development of Maragheh city and provide the best place for future development of the city. Data and Method In the present study, the criteria and sub-criteria and the relationships between them were first defined by the ANP method using Super Design software, and after obtaining the weight for each criterion and sub-criterion, the sub-criteria were first fuzzy and according to the weight of each of them the main criterion was obtained from the sum of these sub-criteria. Finally, the three main criteria of human, environmental and topographic parameters, considering their weight, have provided the main layer of the possibility of physical development of the city. Choosing a suitable method and approach for modeling a system depends entirely on the complexity of that system and complexity is inversely related to the amount of knowledge and understanding of our system. Fuzzy systems can be well used to model two main types of uncertainty in the phenomena. The first type is uncertainty due to the lack of knowledge and human tools in recognizing the complexities of a phenomenon. Results and Discussion Using the three main layers obtained for topographic, environmental and human criteria and according to the weight of each, the final location map of physical development of Maragheh city was obtained. The development map of Maragheh shows that the south-eastern parts are very unsuitable for physical development, while the north-eastern, north-western and south-western parts are suitable for development in terms of three environmental, human and topographic features. Environmental factors seem to have the greatest impact on the development and expansion of cities. According to our findings, and depicting the map of the city development over different years, the final map was obtained for the development of this city which is almost in line with the expansion of the city during the years 1996 to 2006 and 1976 to 1986. Conclusion With the arrival of the third wave of industrialization in Third World countries since the beginning of the twentieth century, production and income in cities, followed by increased demand for urban services and consequently urbanization has expanded. One of the effects of physical growth is related to the expansion of the outskirts of cities beyond the administrative boundaries of any city. Such urban development goes to areas outside the administrative boundaries and changes in land uses. The city of Maragheh has many limitations in terms of physical expansion due to the gardens around the city. In order to prevent the destruction of gardens and agricultural lands as well as physical expansion in line with natural and human criteria, extensive studies should be conducted. Information and data were applied in this study for the analysis of these parameters.The city of Maragheh needs to expand physically following the increase in population naturally and its increasing expansion goes on due to uncontrolled urban migration. In the present study, three main criteria of human, environmental and topography have been used. From the topographic criteria, the south-western parts are the most suitable places and the north-eastern parts of the city are the most unsuitable parts. In terms of environmental criteria, the western and south-western parts and to some extent parts of the north are suitable for development. Due to being a garden city, it is limited to gardens from the surroundings, which makes it difficult to expand from a human and environmental standards point of view. By combining three layers of environment, human and topography, the best place for the development of this city according to the final map was prepared for the optimal location of the future development the city based on ANP Fuzzy method by which it is more suitable in the west and north-west than in the south and south-west.Paying attention to horizontal expansion preserves the traditional texture of the city and single-storey buildings and prevents its vertical expansion. Although vertical expansion has advantages over horizontal spreading out, the current conditions of Maragheh city and its size, as well as its traditional texture and culture, make the need for horizontal expansion more tangible than vertical expansion.By using the right development model, both the traditional construction of the city can be preserved and the problems caused by sporadic development can be reduced, provided that the horizontal development goes in the direction that environmental and human conditions demand.
Rural Planning
Zahra Arabi; Rezvan Ghorbani salkhord; yosef darvishi
Abstract
IntroductionDrought is one of the environmental disasters that are very common in arid and semi-arid country regions. Rainfall defects have different effects on groundwater, soil moisture, and river flow. Meteorological drought indices are calculated directly from meteorological data such as rainfall ...
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IntroductionDrought is one of the environmental disasters that are very common in arid and semi-arid country regions. Rainfall defects have different effects on groundwater, soil moisture, and river flow. Meteorological drought indices are calculated directly from meteorological data such as rainfall and will not be useful in monitoring drought in the absence of data. Therefore, remote sensing techniques can be a useful tool in measuring drought. Drought is a known environmental disaster and has social, economic, and environmental impacts. Lack of rainfall in an area for long periods is known as drought. Drought and rainfall affect the water and agricultural resources of each region. Materials & MethodsDue to the nature of the problem and the subject under study, the present study is descriptive-analytical with emphasis on quantitative methods. In this study, satellite images of Tera Sensor Modis in 2000 and 2017 were used to verify the existence of wet and drought phenomena. In the next step, by examining the rain gauge and synoptic data of the existing stations and using the standardized precipitation index model of three months (May, June, and April), the sample was selected. Next, we compared temperature status indices (TCI) and vegetation health indices (VHI) in these three months to determine the difference between these indices over the three months. Modira Terra satellite was used to study the vegetation status in the study area. Subsequently, vegetation-free areas were isolated from vegetation areas using the conditions set for the NDVI layer, the experimental method was used to determine the threshold value of this index. For this purpose, different thresholds were tested, with the optimum value of 1 being positive. NDVI is less than 1 free of positive plants and more than free of vegetation. MODIS spectral sensor images for surface temperature variables with a spatial resolution of 1 km, including 31 bands (1080/1180 bandwidth, central bandwidth / 11.017 spatial resolution of 1000 m) and 32 bands - 770/11Central Wavelength Band 032/12 Spatial Resolution Power (1000 m) Selected for months that are almost cloudless. All images are downloaded from the SearchEarthData site and edited. Total rainfall in June, April, and May for 20 years has been provided by the Meteorological Organization of Iran. ARC GIS software and geostatistical methods were used to process Excel data. Pearson correlation coefficient was also used to estimate the correlation between the data. Results & DiscussionA standard precipitation index is a powerful tool in analyzing rainfall data. This study aimed to compare the relationship between remote sensing indices and meteorological drought indices and to determine the effectiveness of remote sensing indices in drought monitoring. The correlation between the variables with the SPI index was evaluated and calculated. The results of the indicators are different, so a criterion should be used to evaluate the performance of these indicators. SPI index on a quarterly time scale (correlation with vegetation) was selected as the preferred criterion. According to the results of correlations, the TCI index with the SPI index had a strong correlation with other indices. In the short run, this index has the highest correlation with thermal indices at the level of 1%. The correlation between meteorological drought index and plant water content and thermal indices increases with increasing time intervals. The positive correlation between vegetation indices and plant water content with meteorological drought indices shows that the trend of changes is in line. Therefore, the TCI index makes the drought more accurate and is a better method to estimate drought.ConclusionThe results showed that among the surveyed fish, the most drought trend was observed in the eastern provinces and covers more than 50% of the region. The trend of changes in this slope was statistically significant. According to the results of correlations, the TCI index had a strong correlation with the SPI index with other indices. It can also be concluded that Modis images and processed indices along with climatic indices have the potential to monitor drought. The use of maps derived from drought indices can help improve drought management programs and play a significant role in reducing the effects of drought.
All other Geographic fields of studies , Interdisciplinary
Seyyed Hadi Tabibnia; Faeze Ebrahimipour; Farokhlagha Bahadori
Abstract
Introduction
Today, the issue of development is a concern of many countries. And many local authorities around the world have already begun long-term development for the community and have perfected international best practices for comprehensive development planning and analysis. The central district ...
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Introduction
Today, the issue of development is a concern of many countries. And many local authorities around the world have already begun long-term development for the community and have perfected international best practices for comprehensive development planning and analysis. The central district of Jiroft township has been selected as the scope of the present study; Which in various fields affecting development, has a considerable distance from national and international standards; In terms of development indicators, it is one of the deprived areas of Iran and in this regard, it is a considerable distance from international standards. Different areas affecting poverty, lack of educational facilities, lack of infrastructure and infrastructure are some of the factors that have made it inevitable to address the issue of development in this region. Distribution of selected indicators in the sustainable development of rural areas in the central district of Jiroft.
Data and Method
In line with the purpose and the question; The nature of this research is descriptive-analytical and applied in terms of purpose and based on library studies. The statistical population of this research is the five rural districts of the central district of Jiroft township and the sample size has been omitted. Selected indicators have been collected through the statistical yearbook of the Statistics Center of Iran in 2016. It should be noted that in the first stage, about 80 indicators were selected and in the final selection process, considering the discussion of access to statistical and spatial data, the number of indicators was classified and adjusted to seven general indicators. After extracting the indicators, the weight of the indicators was obtained using the TOPSIS model. At this stage, the rank of rural areas in the central district of Jiroft township was obtained with emphasis on selected indicators; Then, for spatial analysis of the weights obtained from the Shannon entropy stage of the TOPSIS model, and in the next stage, spatial maps were drawn using cluster and non-cluster analysis.
Results and Discussion
Accordingly, the present study has extracted and studied seven development indicators according to the selected sub-indicators to measure the development of rural areas in the central district of Jiroft township. According to the distribution of the mentioned indicators; It can be concluded that the scope of research is very different from the standards of development and the indicators of development are not normal and balanced. On the other hand, measuring the development indicators of the research area shows; That the study area is not of equal value. The analysis of the findings shows that Halil village is developing in terms of sustainable development indicators. Esfahan, Islamabad, are in a semi-privileged state and Dolatabad and Khatunabad are in a deprived situation; This indicates an unfavorable situation and far from the desired standards of development at the global and national levels in the study area.
The results of this study on the level of development with the results of United Nations research (1991); Andriant (2001); Ghanbari et al. (2010); Aliaei and Azizi (1397); Mohammad Manan and Reisi (2015), which were mentioned in the background section of the research, are consistent. Accordingly, all of the above research confirms the lack of equitable distribution of services and facilities, as well as the lack of careful planning for regional development, regional inequality, and the lack of integrated development.
Conclusion
The analysis shows that Halil County is developing in terms of sustainable development indicators. Esfaandaghe, Islamabad, are in a semi-privileged state and Dolatabad and Khatunabad are in a deprived situation; This indicates an unfavourable situation and far from the desired standards of development at the global and national levels in the study area.
Also, in order to find regional inequalities and eliminate these inequalities, it is necessary to level the regions and regions in terms of development. By recognizing regional inequalities and ranking them at the district and regional level, better management of regions can be done and according to strategies such as creating planning areas at the provincial, city and district levels, implementing policies. And bottom-up programs Given that most decisions are made in Kerman province in Kerman city, such centralist policies should be reduced and special attention should be paid to the opportunities and limitations of each townships. These are some of the things that can help reduce inequality in the area under study.
Geomorphology
Mousa Abedini; biuk fathalizadeh; Masomeh Rajabi
Abstract
Introduction
When a natural process threatens human life or property, it is called natural hazard. Disasters’ statistics have shown that their effects are, considerably, increasing all over the world. Most of such disasters originate from geomorphological events. In fact, natural disasters have ...
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Introduction
When a natural process threatens human life or property, it is called natural hazard. Disasters’ statistics have shown that their effects are, considerably, increasing all over the world. Most of such disasters originate from geomorphological events. In fact, natural disasters have been a global concern and most of them have mainly been geomorphological. Hence, developing countries, in particular, are deeply influenced by such disasters. One way of decreasing damages caused by natural disasters is identification of disaster-prone areas and prevention of their development in such areas relying on land use planning. In this research, geomorphological hazards of flood, landslide and neotectonics were investigated in Zonouzchay catchment. The catchment in an area of 323 square km has been located in political-administrative zone of Marand county.
Methodology
The aim of the present study is to evaluate geomorphological hazards in Zonouzchay catchment through preparing zoning maps of flood, landslide and neotectonics hazards. Digital evaluation model images of height (DEM), geological maps and sentinel satellite images are the most important data used in the present study. For preparation of flood and landslide hazards’ map in Zonouzchay catchment, ten variables and effective parameters on flooding and flood spreading were combined in GIS environment. These variables are considered for zoning flooding hazard factors such as height, slope, convexity of the land surface, valley depth, lithological units, drainage density, distance from the main streams, height of the runoff, use and vegetation. For zoning landslide occurrence risk, the above mentioned variables (except for stream height, drainage density and valley depth) were used along with the three variables of distance from fault, slope direction and rainfall. ANP model in GIS was used in order to combine effective variables on flooding risk and landslide in Zonouzchay catchment. Moreover, zoning relative neotecnic activities for the underlying area was conducted by using relative tectonic activity index (Al Hamdouni, et al, 2008). Relative tectonics activity index (Iat) is developed by combination of other indexes. The index classifies the perspectives in four classes of relative tectonic activities:
Class 1: too high tectonic activities with values 1 < S/n < 1.5
Class 2: high tectonic activities with values 1.5 < S/n < 2
Class 3: medium tectonic activities with values 2 < S/n < 2
Class 4: low tectonic activities with values S/n < 2.5
Results and Discussion
Zoning Relative Tectonic Activity
Results of Iat index-basedzoning indicate that neotectonic activities in Zonouzchay catchment are, generally, medium to relatively weak. Field observations also indicate that erosive processes (in spite of resistant formations) are predominate in the study area. Lack or rare dispersion of neotectonic landforms, retreat and destruction of mountain fronts and widening of the valleys are among the reasons, which show relative weakness of the active tectonic in Zonouzchay catchment. The main part of the morpho-tectonic landforms of the catchment is in line with Zonouz-Harzand fault. For most of the sub-catchments Iat values are in classes 3,4, which shows average to weak status of the relative active tectonic in the catchment.
Zoning Flood Event Risk
ANP model-based results indicate that from among the employed variables, slope, distance from river and land surface convexity are, relatively, the most important variables with coefficients 0.23, 0.19 and 0.16. Findings of the study indicate that about 4% of Zonouzchay catchment area is in too high risk class, 7.4% in high risk class, 8.3% in medium risk, 21.7% in too low risk class and 58.6% is in too low risk class. Almost all upstream parts of the study catchment are in low risk to high risk classes. In the middle parts of the study catchment, flood zones are mostly bounded to two main valleys of the catchment. Width of the valleys has increased in different periods and, consequently, flood plains have been formed in the basin of such valleys. Some parts of Miyab and New Harzand villages have been located in this geomorphologic position. In the downstream parts of the catchment, width of Zonouzchay has increased considerably and also the two main streams of the study catchment join each other in this part. Presence of low slope lands, low relative height, adjacency to the main rivers, lower values of convexity index, higher density of drainage and the valley depth are considered as the most important effective factors of this part of the catchment in terms of flood event.
Landslide Risk Zoning
According to the results of ANP model, the three variables of slope with coefficient of 0.24, lithology with coefficient of 0.22 and rainfall with coefficient of 0.16 have the key influence on landslide occurrence in the study area. Hence, about 16.6 % of the catchment area is in too low risk class, about 38.1% is in low risk class, about 23% is in medium risk class, 15.8% is in high risk class and finally 6.5% is in too high risk class. Spatial distribution of the risk classes indicates concentration of high risk and too high risk classes in the middle arts of the study catchment. This can be related to various factors. Maybe, the most important reason is related to presence of geological formations prone to landslide and appropriate slopes for occurrence of such geomorphological process. In fact, in the middle parts of the study area dominance of slope 10%-40% , presence of high alluvial terraces , also occurrence of Marens , conglomerate formulations with Maren interlayers and dispersion of Flysch type have provided appropriate conditions for landslide.
Conclusion
Results of geomorphological indexes indicate that considerable part of anomalies of this index are originated from lithological differences of the area. Moreover, active tectonic zoning of the area shows relative weakness of neotectonic processes and movement of the area’s faults along with dominance of erosive processes. Regarding flood occurrence risk, results of ANP model indicated that the variables of slope, distance from river and convexity of the land surface have higher importance in flooding. From flooding occurrence perspective, about 4% of Zonouzchay catchment is in too high risk class and 7.4% is in high risk class. The dangerous zones are accordant to valleys’ bed of the two main streams of the catchment and hence, some parts of the residents in these valleys are exposed to destructive floods. Finally, based on results of ANP model results, three variables of slope, lithology and rainfall have higher importance in probability of landslide occurrence in the study area. About 16% of Zonouzchay catchment is in high risk class, and 7% of it is in too high risk class of landslide. Landslide occurrence in the middle parts of the catchment is highly expected due to a set of conditions such as vulnerable slope and geological formations.
Urban Planning
ali akbar taghipour; Hossien Rostami
Abstract
Introduction Security has always been one of the most important issues facing human beings. Throughout history, man has sought to have security through various defending instruments. This defense has two types including military and civil defense called respectively, active defense and passive defense. ...
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Introduction Security has always been one of the most important issues facing human beings. Throughout history, man has sought to have security through various defending instruments. This defense has two types including military and civil defense called respectively, active defense and passive defense. Passive defense is a strategic plan requiring direct management and planning of expert human forces including instruments, enginery, organization, training, and management of forces (Taghvayi and Jozi Khamselouyi, 2012:17). Considering the high volume of capitalization and establishment of many installations as well as economic tools and most importantly, high population residences, cities have significant financial and bodily vulnerabilities in case of the outbreak of war. Due to its strategic status, Tabriz city, as a metropolitan in the northwest part of Iran, faces various human threats. This city is one of the five regions of Iran facing ethnic regionalism (Mohammadi et al., 2008:60). According to the geographical, geopolitical, political, and economic conditions of Tabriz, it has been sometimes recognized as the economic center of Iran, and sometimes at least in the north-west region of the country (currently), it has been identified as the first pole of industry, trading, and commerce (GHorbani, 2003:123). The existence of important economic, military and political centers has made the discussion of the passive defense subject of this city an important issue. Data and Method The purposeful article was developmental-applied in terms of policy-making, and it was analytical-descriptive in terms of the design of the study. To collect the literature of the subject and theories of the study, library and documentary method was utilized. Moreover, Arc Gis, version 10, software was used to analyze the data and provide the required maps, which had an important role in the advancement of the study after collecting various layers since they showed different terms. Among the most important utilized criteria and indexes for the analysis, urban electrical substation privacies, urban gas pressure reduction substation privacies (Siami et al., 2013:31), gas and petrol station privacies (Valipour et al., 2014:174), military center privacies, distance from hospitals, distance from main streets (Pour Mohammadi et al., 2010:111), water sources privacies (Ministry of energy, 2014:161), distance from firefighting centers (Azizim Bornafar, 2012:132) and distance from open and green spaces (Razavian, 2002:142) could be highlighted. Results and Discussion Having accomplished the standardization of layers, their integration was the second part of the research. To this end, and for determining their importance and the weight of each layer, a hierarchal analysis method was utilized for such samples whose criteria number was high. The target Expert Choice hierarchal analysis model was determined in specific software and the final weight of each layer was calculated. As the weight of each layer was obtained, they were integrated using GIS, thus the final map of vulnerability status was shown. The results of zoning indicated that some parts of Tabriz city, especially regions from the center of the city to the eastern parts and northern parts, were the most suburbanite fabrics of the city and had higher densities; moreover, some of the newer fabrics in the western parts of the city had higher vulnerabilities. Besides, moderate and high vulnerabilities could be observed around the main streets of the city and highroads due to the importance of these infrastructures and the establishment of other related infrastructures related to transportation services. Conclusion The results of this study were somehow in line with the studies conducted by Siami et al., (2013) since both of the studies showed that regions having high population densities that needed various infrastructures had high vulnerabilities. Moreover, the hierarchal analysis method indicated that the vulnerability of infrastructures in Tabriz included respectively, military centers, electronic, telecommunication, streets, gas, and hospital infrastructures. Besides, having a view on the population and building density map and their adjustment with the vulnerability of infrastructures, it could be stated that most of the areas having high vulnerability were located in these overgrown regions, thus, the populated regions would have more vulnerability in crisis time; this fact makes the subject of crisis management and serving an important issue. In central parts of the city, the vulnerability was low due to the lack of vital installations (lack of empty lands), however, the vulnerability of infrastructures was high in suburbanite regions.
Geomorphology
sayyad asghari; delnya palizban; Hadi Emami; ehsan ghaleh
Abstract
Introduction Landslide is a term that encompasses a variety of amplitude motions and causes the movement of a mass of material in the slopes. And creep is classified. Natural slope instability is one of the geomorphological and geological phenomena that plays an effective role in deforming the ...
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Introduction Landslide is a term that encompasses a variety of amplitude motions and causes the movement of a mass of material in the slopes. And creep is classified. Natural slope instability is one of the geomorphological and geological phenomena that plays an effective role in deforming the earth's surface. Identifying areas with potential for landslides and their zoning is one of the key steps in managing environmental hazards and reducing the damage caused by this phenomenon, because this phenomenon causes financial and human costs, soil and land degradation and increased sediment production at the basin outlet. It becomes. Iran with its predominantly mountainous topography, high tectonic activity and seismicity, diverse geological and climatic conditions, has the most natural conditions to create a wide range of landslides. The purpose of this study is to zoning the risk of landslides on the Sarab-Nir road. In this research, two models of network analysis and fuzzy logic are examined and evaluated. It is hoped that eventually, by preparing a landslide risk zoning map, it will be of great help to planners and managers in order to reduce potential damages and find safer locations for development, construction and road construction. Methodology Sarab-Nir road is located between East Azarbaijan province and Ardabil province and is a communication route between these two provinces, whose geographical coordinates are 37 degrees and 94 minutes to 38 degrees and 03 minutes north latitude and 47 degrees and 53 minutes to 48 degrees and 01 minutes. It is east longitude. In this study, network analysis model was used to determine areas prone to fall and zoning. In order to better understand the causes of landslides and also to organize the research in the field, the study area was visited and 15 geographical points from different areas of the study area were recorded. The geographical location of the points prone to fall was also recorded with GPS. Then, according to the network analysis model, information layers were prepared in ArcGIS software. The information layers for landslide risk zoning are: fault, slope, slope direction, distance from road, and distance from waterway, land use, geology (lithology), precipitation, altitude and vegetation. The elevation file or digital model of the elevation of the area was prepared with an accuracy of 30 meters from the USGS site and the desired DEM is a digital file obtained from the ASTER sensor and according to this DEM, the information layer such as streams, slope and direction The slope was obtained. Results and Discussion Four maps have been developed to investigate landslide hazards, which are rainfall, slope, elevation and land use layers. After creating information layers in order to prepare the final landslide hazard map, fuzzy information layer maps were created. In this study, in order to determine the effect of different classes of criteria on landslide sensitivity zoning, the layers are based on the type of performance of each in the landslide event using fuzzy membership functions in the range of zero to 1 fuzzy. Were made. The results obtained from the information layers and finally the landslide hazard map show that altitudes of more than 2000 meters have the highest share of landslides, and altitudes of 1400 meters have been significant landslides due to the instability of the slopes against Climatic and environmental factors. Also, most of the landslides occurred at a distance of 3 to 6 km from the faults, which shows the importance of faults against landslides. About 40% of landslides occur in very high-risk classes. This indicates that the model has a high capability in predicting landslides. It is necessary to explain that most of the landslides occur in the area of Saein pass, which have very favourable conditions for the occurrence of range movements that start from 25 km of mirage and continue for a distance of 15 km of Nir. Conclusion Factors such as slope, precipitation and geology play a more important role in landslides than other factors. Slopes of 60 to 80% have the greatest impact on landslides, which are more pronounced at altitudes above 2000 meters. Therefore, altitudes above 2000 meters have the most landslides. Also, due to the direct relationship between altitude and climatic fluctuations in these altitudes, the amount of precipitation is higher and, of course, has a great impact on the occurrence of landslides. In these areas, vegetation is at a minimum and due to the cold region, the vegetation in these areas is very small, which prepares the conditions for landslides and due to the presence of sedimentary formations such as sandstone, Siltstone mudstone with tuff interbreeds in the area, the conditions for landslides have become more prone and because these formations lose their stability sooner and are strongly influenced by physicochemical factors, they are more prone to landslides than other formations. To be. According to the results, the low risk floor with the highest value, 405.44 square kilometers, occupies approximately 30.87 percent of the area, but the very high risk floor with 288.2 square kilometers and the high risk class with 23.23 square kilometers. , Occupy a total of 37.25% of the area of risk classes.
Geomorphology
Shahram Roustaie; Davod Mokhtari; Zahar Ashrafi Fini
Abstract
Introduction Landslide is one of the most important and disastrous natural hazards which can bring many financial losses and heavy casualties worldwide every year. Entropy means a quantity of disorder between causes, results or decisions taken in different situations, it can be highly effective particularly ...
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Introduction Landslide is one of the most important and disastrous natural hazards which can bring many financial losses and heavy casualties worldwide every year. Entropy means a quantity of disorder between causes, results or decisions taken in different situations, it can be highly effective particularly in geomorphological studies such as landslide, where existing data are confused with uncertainties. Material and Methods Topographic maps 1: 25000 scaled, geological map of Makran and Marzanabad scale map 1: 100000 and ASAR images from ENVISAT since 2003 till 2009 in the region were used as the main data in this model. Active landslide also detected in the basin. Then, 17 zones were selected via field visiting and Google earth software images. Also location of landslides recorded using GPS. Analyzing the data and providing the required maps were done using Arc Gis10 and SAGA. A total number of 13 effective parameters were selected based on condition of studied areas for next step. Then slide layer, slide direction, elevation, geology, land use, distance to fault, distance from the river and distance from the road obtained by Arc Gis10 analysis, vegetation layer (NDVI) measured by ENVI4.2 software and the layers of surface area ratio (ASR), topography index (TPI), Topographic Wetness Index (TWI) and slide length index (SLS ) were analyzed by SAGA software. After providing the information layers and importing the landslide locations, the properties of each slip extracted due to the mentioned layers and scoring was regarding to the role of each factor in the occurrence of slide. And the primary matrix was formed according to the entropy method. The decision matrix contains information which can be evaluated by entropy as a criterion. Then by calculating the entropy matrix and weight of 13 factors (WJ), the (HI) index will be obtained as landslide risk hazard Results and discussions At first due to the characteristics of the occurred landslide, each class was scored from the information layers which were obtained by examining the region after two field visits, study of aerial photographs and satellite imagery and identification of the affecting factors and their roles to create slip. Then the information layers used in the research were categorized and scored as a raster data and utilized as the main data in the formation of an entropy matrix for further analysis. To convert qualitative values into quantitative a bipolar scale is used. The bipolar interval scale is a general method for ranking quantitative and qualitative indexes. Measurement in this technique is based on a 10-point scale so that zero specifies the lowest possible value which is practically comprehensible and ten represents the maximum possible value of the intended index. The middle point is also the point of dividing the scale into favorable and unfavorable data. Conclusion Prioritizing the effective factors using the Shannon entropy index indicates that data layers such as slides direction, land use, elevation, slope, normalized vegetation index and the distance from the river had the greatest effect on the landslide occurrence in the area. And the topography, moisture index, geology, distance from fault and road, and the rest of the information layers had the least effect. Based on landslide hazard map of Taleghan watershed, very low to low risks regions are some areas in the northeast, central and southwest regions, while most of the studied areas have a moderate to very high risks. In general, site locations which could be at risk in the event of a landslide are limited to residential areas, roads, rivers, lakes and power lines. There are various land use in the region and Residential and demographic areas are at the top of the priority list. One the other hand there is Taleghan dam which can create a much greater potential risk if landslide happens at its location.
Urban Planning
Ebrahim Asghari-Kaljahi; Ghodrat Barzegari; Robab Azarmi; Azadeh Shahbazi
Volume 22, Issue 66 , January 2019, , Pages 23-44
Abstract
Site selection for landfill is an important issue for planning and management of solid waste materials on the metropolitan cities. In order to prevention of environmental, ecological and economical impacts of waste material, investigations for selection of suitable site should be done in a scientific ...
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Site selection for landfill is an important issue for planning and management of solid waste materials on the metropolitan cities. In order to prevention of environmental, ecological and economical impacts of waste material, investigations for selection of suitable site should be done in a scientific trend. Nowadays multi-criteria decision analysis methods and GIS systems are widely using for environmental planning.Shahindezh city with 35 tones daily waste material production is facing with environmental, social and healthy problems. In this research, in roder to selection of suitable site for landfill of Shahindezh city, some important criteria including hydrogeology, hydrogeology, litology, land use, vegetables developing, soil condition, topography, transmission lines, distance from city and main roads and faults are considered. After making pair-wise comparison matrix for the criteria, the weight of information layers determined by using of Expert Choice11 software in the GIS media based on Analytic Hierarchy Process (AHP). Therefore the appropriate zones for landfill of Shahindezh city are divided into four categories according to the location potential from completely suitable to completely unsuitable. As a result 6 areas are selected and subjected to visiting and filed investigations. In term of site visit, three areas are determined as proper locations. The selected areas are compared to each other based on similarity to the ideal choice by using TOPSIS method. Finally area no. 2 located in the west of Shahindezh (in the north of the upper Sarojeh village) was introduced as the best area for landfill site of this city.
Geomorphology
Mohammad Hossein Rezaei Mogaddam; Mohammadreza Nikjoo; Davod Mokhtari; Ahmad Fakeri Far; Kazem Koshdel
Volume 22, Issue 64 , September 2018, , Pages 81-101
Abstract
The streams of rivers are extremely complex in nature. Rivers are beneficial for natural vegetation, animals, living organisms and human communities. The river provides the possibility of drinking water and irrigation of agricultural fields. Rivers are considered as active land cultivators with erosion ...
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The streams of rivers are extremely complex in nature. Rivers are beneficial for natural vegetation, animals, living organisms and human communities. The river provides the possibility of drinking water and irrigation of agricultural fields. Rivers are considered as active land cultivators with erosion and sedimentation. Some of the negative effects of rivers such as floods are considered as a natural disaster. Such natural disasters have been shown when the river by anthropogenic activities by changing the shape of the river and arched their plans change. Meandering parts of the rivers are vulnerable to floods. Therefore, river studies are very important in terms of hydraulic characteristics, sediment, width to depth ratio, morphology and arched plan. Kaleibar Chai basin has located on the North West of the country. This research pays attention to the arcuate plan of Kaleibar River from the city of Kaleibar to Jananloo village (one of the branches of Aras River). The study region is part of Kaleibar Chai River with 72 km of length. The channel consists of right, waving, meandering, and braided patterns. The study of horizontal plan of the river in relation to different active processes shows the mutual relationship between hydrological parameters and the materials in the river. The continual changes in sinuosity index in the channel are indicators of variations in the river behavior. For doing this research we used Google Earth and DEM 10m images. The river was divided into 4 openings in which topographic conditions were considered. The river sinuosity index was calculated for all 4 openings in GIS software under the formula: TSI= . In this equation TCI is topographic sinuosity index, CL is the length of the river channel, Al is the aerial length of the beginning and ending part of the channel. The maximum sinuosity index for different lengths of the Kaleibar Chai River was estimated at 1.05 to 1.83. The heterogeneity of bed materials causes erosion and deposition on the river bed of Kaleibar Chai. Erosion and depositional processes occur in the area during the spring and fall floods. The variety of materials and their sizes cause erosion and the collapse of the brinks and the loop in sinuosity index, which finally lead to channel changes. The study of sinuosity index and the identification of rivers patterns help ease the planning procedure
Urban Planning
Mohammad Hosein Yazdani; Ebrahim Firoozei Majande
Abstract
Uneven and unequal distribution of public land has been one of the consequences of libertine urban growth in the recent decades that has led to an unbalance in the distribution of urban public lands. This has had enormous implications, one of them being the lack of equal access to municipal services ...
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Uneven and unequal distribution of public land has been one of the consequences of libertine urban growth in the recent decades that has led to an unbalance in the distribution of urban public lands. This has had enormous implications, one of them being the lack of equal access to municipal services for citizens. Due to political and political developments in Ardabil during the recent decades this city achieved a massive physical growth so that this libertine physical growth has led to an unbalanced distribution of public land and caused forming a bipolar wealthy and deprived city. Accordingly this study aims at investigating and analyzing the public land distribution manner to evaluate the distribution of public utility and to grade and determine wealthy and deprived urban regions. This study employs descriptive-analytical method and essentially could have applied nature. To collect data the library method was used. To achieve study objectives two hypotheses were designed, in order to test the first one spatial autocorrelation analysis tools and the nearest neighbor index and to test the second one Kernel density function were used.
Urban Planning
Kiumars Habibi; Mohammad Ezzati; Kamal Torabi; Bakhtiar Ezzat Panah
Abstract
Considering high construction and population density, unstable structures, narrow streets, and high rate of inclusion in cities, it is necessary to plan and carry out researches to minimize vulnerabilities caused by natural events. To accomplish this, one of the important efforts can be identifying effective ...
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Considering high construction and population density, unstable structures, narrow streets, and high rate of inclusion in cities, it is necessary to plan and carry out researches to minimize vulnerabilities caused by natural events. To accomplish this, one of the important efforts can be identifying effective factors in reducing vulnerabilities of cities against earthquake. Recognizing and investigating the vulnerability of urban areas, particularly within the context of the old fabrics and informal settlements, is of great importance. By specifying vulnerable areas against earthquakes, with an awareness of the damage they may suffer, cities can be planned and designed in a way that the least damage during an earthquake is received. In this paper, by picking several indicators such as land use, street width, number of floors, rate of inclusion, population density, fabric segmentation, occupied space, floor-area ratio of buildings, built quality, structure type, building age, access to open spaces and distance to the main seismic belt and by employing the MIHWP model along with the capabilities of the Arc GIS software and by multiplying and overlaying the data layers of indexed indicators, the seismic vulnerability of the region 10 of Tabriz has been represented. The results conclude that the buildings with low width streets, high number of floors and high value of enclosure, less lot areas, high occupied space and building and population density, low built quality, unstable structures, old buildings, more distance to open space and proximity to major seismic belts, have been rated as high vulnerable areas. Within the region, moving from the North West to the center and North East, vulnerability considerably increases
Climatology
Behrouz Sobhani; Mohammad Framarzi
Volume 20, Issue 56 , August 2016, , Pages 171-191
Abstract
Crop production ability and its potential are significantly up to climate, topography and land use which are the most important environmental factors. In this study, using climatic data such as temperature, precipitation, number of frost days, sunny hours and relative humidity related to phonology steps ...
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Crop production ability and its potential are significantly up to climate, topography and land use which are the most important environmental factors. In this study, using climatic data such as temperature, precipitation, number of frost days, sunny hours and relative humidity related to phonology steps of saffron growing, Also ground resource data such as topography, land use layers which are prepared by Landsat 8 satellite imagery dated 14/5/2013. Evaluating each of these parameters have been taken in relation to the climate and ecology needs of saffron. Information layers of them were prepared by adjusting data to the surface, and processing them by GIS technology. Multi-criteria decision analysis methods (MCDM), based on vikor were used in order to prioritize and evaluate information layers and their weights in connection with each other. Then layers were weighted based on the criteria and subject model also these layers were overlapped and analyzed in GIS environment. Consequentially, the final layer of land suitability was prepared for saffron cultivation. In this study, 10.23, 45.25 and 45.52 percent of the total area are good, average and weak suitability lands respectively. According to this research, vikor method can have an acceptable function over selecting the fitness values for each class.
Shahrivar Rustaee; Mohsen Ahadnejad; Akbar Asgharizamani; Alireza Zangane; Shahram Saeedi
Volume 19, Issue 53 , September 2015, , Pages 137-166
Abstract
Abstract Informal Settlements, resulting from swift urbanization in the contemporary world and the socioeconomic inequalities across regions, have made cities-especially metropolises like Kermanshah, Iran- face a great deal of problems. Therefore, the present study aimed to evaluate the informal settlements ...
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Abstract Informal Settlements, resulting from swift urbanization in the contemporary world and the socioeconomic inequalities across regions, have made cities-especially metropolises like Kermanshah, Iran- face a great deal of problems. Therefore, the present study aimed to evaluate the informal settlements of Dolat Abad and Shater Abad in Kermanshah. To this end, an analytic-quantitative method with an applied approach was used, and the statistical population of the research consisted of Dolat Abad and Shater Abad settlements, based in western and eastern Kermanshah, respectively. So, the information on the statistical blocks in 2006 and 30 indexes, changed into three combined factors, were analyzed by factor analysis, Arc/GIS and Arc/View Software. As for Dolat Abad settlement, the results showed that 20 blocks (11.1% of the population) had appropriate states in terms of poverty, and 31 (17.2%), 57 (31.7%), 50 (27.8%) and 16 blocks (8.9%) held relatively appropriate, average, relatively inappropriate and inappropriate states in terms of poverty, respectively. Furthermore, the results of evaluation of poverty in Shater Abad settlement demonstrated that 12 blocks (4.5% of the population) had inappropriate states in terms of poverty, and 74 (28%), 92 (34.8%), 60 (22.7%) and 13 blocks (4.9%) held relatively inappropriate, average, relatively appropriate and appropriate states in terms of poverty, respectively. In addition, the results of the present study suggested that the residential blocks based in Kermanshah were sites for manifestation of social, economic, cultural and structural distinctions. These settlements symbolize poverty and go through a different process in terms of dynamics, and more to the point, the existence of inequality across the urban areas of Kermanshah has led to spatial, social and economic segregation. Not to mention, the results of the present work were dependent on the applied indexes, which may be affected through applying other ones.
Climatology
ali Mohammad Khorshiddoust; Behrooz Sobhani; Kamel Azarm; Jamal Amini
Volume 19, Issue 52 , June 2015, , Pages 141-161
Abstract
Canola is the world third leading oil seed after soybean and oil palm by producing 15 percent of the global plant oil. Climate, topography and lands capability are the most important environmental factors on which the crop production capability in a region depends. Therefore by evaluating these factors ...
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Canola is the world third leading oil seed after soybean and oil palm by producing 15 percent of the global plant oil. Climate, topography and lands capability are the most important environmental factors on which the crop production capability in a region depends. Therefore by evaluating these factors one can identify suitable lands for canola cultivation. In the present study, the climatological data such as temperature, precipitation, growth degree day, relative humidity, freezing days, and sunshine hours were collected from the West Azerbaijan province synoptic and rain gauge stations (since their installation untill 1388) which were associated with the phenologic stages of canola growth. In addition to the climatological data, earth resources like topographic layers, lands capability, soil depth and land-use were analyzed focusing on the climatological and ecological requirements of canola. After generalizing the data and processing by using ArcGIS, their corresponding information layers were derived. In order to prioritize and assess the criteria and information layers in relation to each other, the multi criteria decision method was employed based on analytical hierarchy process. Then, combination and spatial analysis of the information layers using TOPSIS model and GIS capabilities were done and the final capability ecological evaluation layer for canola cultivation was produced. Based on the obtained results, the province lands were divided into four categories of highly suitable (%18.6), suitable (%34.4), moderate (%32.1) and weak (%14.7) lands on the basis of the environmental and climatologocal potentials for canola cultivation.
Urban Planning
Fatemeh Gessami; Elham Yousefi; Esmail Salehi; Mohsen Kafi
Volume 19, Issue 52 , June 2015, , Pages 257-276
Abstract
Urban population growth causes serious consequences for the environment. Here is where creating macro green space as the most important balancing factor becomes a necessity. Therefore, an undeniable need in urbanization and future development of urban space is identifying the site of green space and ...
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Urban population growth causes serious consequences for the environment. Here is where creating macro green space as the most important balancing factor becomes a necessity. Therefore, an undeniable need in urbanization and future development of urban space is identifying the site of green space and urban parks. Land suitability analysis is a process identifying an appropriate site in a certain area for certain land use. In the present research, land suitability analysis is used to examine the suitability of regional parks in Jiroft City. Hence, first the current situation of urban green space is examined on the basis of spatial of factors (slope, distance from water source) and situational factors (distance from historical buildings, distance from river, distance from downtown, price) and then regional park of suitability is analyzed by using GIS. Suitable green spaces are presented and finally sites for constructing new green spaces are identified. The results of this research showed that the regional parks of Jiroft City are situated in appropriate site and the allocated lands for constructing new regional parks need revision
Seyedasadollah Hejazi
Volume 19, Issue 51 , April 2015, , Pages 127-143
Abstract
Increment of soil carbon is an appropriate method for reducing atmosphere dioxide carbon density resulted from foresting in the unutilized and destroyed lands and its optimal management due to increase of concern about universal heating and changing of climate. According to universal heating and ...
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Increment of soil carbon is an appropriate method for reducing atmosphere dioxide carbon density resulted from foresting in the unutilized and destroyed lands and its optimal management due to increase of concern about universal heating and changing of climate. According to universal heating and expansion of urban industries issue in the air pollution; capacity of Tabriz Province lands in establishing of parks has been investigated by employing AHP. The data were collected by available basic maps and spot 2005 satellite images and also field studies. The zone digits of maps were converted to criterion maps (slope, direction, height, land usage, geology, soil, city, communication network, village and rivers) by using spatial information techniques and they were valuated for paired comparison. The value of each scale was considered according to capacity of each unit. The paired comparison of the spatial information techniques criteriawas conducted by using Marionian attached program in GIS and the studied criterion weight were calculated. Then the final map in raster format was extracted by using each weight and was categorized in five classes range from very weak to very good and the best location was extracted with an area about four percent of the whole Province
Mohammadreza Pourmohammadi; Mohammadreza Karami
Volume 18, Issue 50 , February 2015, , Pages 55-88
Abstract
Evaluation of the vulnerability is one of the most important challenges facing metropolises in Iran. Sensitivity of the issue is duplicated when the city is not only timeworn and includes squatter areas, but also is exposed to natural disasters such as earthquake and flood. Zoning the risk of earthquake ...
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Evaluation of the vulnerability is one of the most important challenges facing metropolises in Iran. Sensitivity of the issue is duplicated when the city is not only timeworn and includes squatter areas, but also is exposed to natural disasters such as earthquake and flood. Zoning the risk of earthquake and its modeling by advanced techniques regarding the vulnerability level of cities is inevitable. In Tabriz, diversity of urban textures, proximity to fault lines and lack of precision and revision on the subject, increases the vulnerabilit of such textures besides squatter textures. This project studies the municipal areas (1 and 5) in Tabriz city, regarding the nature of earthquake and its relation with four factors: population density, building density, quality of buildings and types of materials. Furthermore, the relation of vulnerability due to earthquake has been studied and modeled taking the advantage of the GIS robust technique with integrating Kernel Density Estimation model (KDE) and Analytical Hierarchy Possess model (AHP) in order to determine the vulnerable areas more precisely with an emphasis on residential application.
seayed asadollah Hejazi
Volume 18, Issue 50 , February 2015, , Pages 135-152
Abstract
This article aims to evaluate sensitivity of Goijabel basin lands in landsliding based on GIS and AHP. The main reason for selection of this basin for research is to observe the current landsliding in the region by the author and environmental preservation attitude of the authors. This basin is one of ...
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This article aims to evaluate sensitivity of Goijabel basin lands in landsliding based on GIS and AHP. The main reason for selection of this basin for research is to observe the current landsliding in the region by the author and environmental preservation attitude of the authors. This basin is one of the sub-basins of Aharchi in area of 7406 Hectares with geographical statues of 46,47,21/26 to 46,56,53/64 east longitude and 38,21, 42/13 to 38,27,39/04 north latitude. The criteria selected for analysis of landsliding sensitivity in the study basin involve nine parameters (slope, aspect, height, lithology, fault, road, landuse, precipitation and main water ways) extracted from basic maps, field studies and spot satellite images and their primary valuation was conducted by using GIS techniques in five layers relative to the effect of each measure on incidence of landsliding. Then pair comparison of the layers was carried out by using Mariyoni attached program (AHP extension) and final map of the land sensitivity in landsliding was extracted. The results of landsliding sensitivity analysis in Goijabel basin showed that the most effective factor in land sliding is lithology with weight of 0.3113 according to the highest weight and then the height with minimum weight of 0.0178 is the criterion with lowest effect in landsliding. Also the analysis of landsliding danger in the study basin shows that endangered lands with high sliding capability involve 1222 ha which cover %16.5 of the total regions.
Karim Hosseinzade Delir; MohammadHosein Khodabakhah Charkhaloo
Volume 18, Issue 50 , February 2015, , Pages 153-174
Abstract
Large earthquakes usually cause huge damages to human life. Street network vulnerability makes the rescue operation to encounter serious difficulties especially at the first 72 hours after the incident. Today, physical expansion and high density of great cities, due to no attention to hierarchical street ...
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Large earthquakes usually cause huge damages to human life. Street network vulnerability makes the rescue operation to encounter serious difficulties especially at the first 72 hours after the incident. Today, physical expansion and high density of great cities, due to no attention to hierarchical street network, narrow access roads, large distance from medical care centers and location at areas with high seismic risk, would lead to a perilous and unpredictable situation in case of the earthquake. Occurrence of earthquakes with large magnitude would destroy the functionality of street networks and cause large amount of casualties and major financial damages. In Tabriz city, the areas of first and fifth zones are equal to 3327 hectares. The area of first and fifth zones is over 2844 and 483 ha respectively. According to current estimates, the population of these zones is equal to over 458939 people. In this research using 12 indexes such as: land use, width of roads, height of buildings, street inclusion, population and construction density, buildings area, quality, materials and antiquity of building, access to medical centers, distance and proximity to major faults vulnerability degree of street networks in zones 1 and 5 of detailed plan of Tabriz against the earthquake is calculated through overlaying maps and data in combination with IHWP method and GIS. The article concludes that buildings alongside the streets with high population and building density, low building quality, far to rescue centers and high level of inclusion represent high rate of vulnerability, compared with other buildings. Also highways and streets with substantial width and low building and population density hold little values of vulnerability. By moving on from east to west of the zones, the vulnerability increases. This vulnerability of streets is in high level in the central zones. Therefore, the existing street networks in the center will be unable to perform their role at the case of occurrence of earthquake.
gholamreza Dinpanah
Volume 18, Issue 50 , February 2015, , Pages 175-188
Abstract
Large earthquakes usually cause huge damages to human life. Street network vulnerability makes the rescue operation to encounter serious difficulties especially at the first 72 hours after the incident. Today, physical expansion and high density of great cities, due to no attention to hierarchical street ...
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Large earthquakes usually cause huge damages to human life. Street network vulnerability makes the rescue operation to encounter serious difficulties especially at the first 72 hours after the incident. Today, physical expansion and high density of great cities, due to no attention to hierarchical street network, narrow access roads, large distance from medical care centers and location at areas with high seismic risk, would lead to a perilous and unpredictable situation in case of the earthquake. Occurrence of earthquakes with large magnitude would destroy the functionality of street networks and cause large amount of casualties and major financial damages. In Tabriz city, the areas of first and fifth zones are equal to 3327 hectares. The area of first and fifth zones is over 2844 and 483 ha respectively. According to current estimates, the population of these zones is equal to over 458939 people. In this research using 12 indexes such as: land use, width of roads, height of buildings, street inclusion, population and construction density, buildings area, quality, materials and antiquity of building, access to medical centers, distance and proximity to major faults vulnerability degree of street networks in zones 1 and 5 of detailed plan of Tabriz against the earthquake is calculated through overlaying maps and data in combination with IHWP method and GIS. The article concludes that buildings alongside the streets with high population and building density, low building quality, far to rescue centers and high level of inclusion represent high rate of vulnerability, compared with other buildings. Also highways and streets with substantial width and low building and population density hold little values of vulnerability. By moving on from east to west of the zones, the vulnerability increases. This vulnerability of streets is in high level in the central zones. Therefore, the existing street networks in the center will be unable to perform their role at the case of occurrence of earthquake.
Asghar Zarabi; Meysam Rezaei; Behnam Naderi; Behrooz Karimi
Volume 18, Issue 50 , February 2015, , Pages 207-234
Abstract
Following the emigrant increasing and city population growth in the world especially in developing countries, the land use has special importance. Because by dedicating the land to essential uses, we can assure the major purposes in urban planning like: health, beauty, welfare, etc. In this research, ...
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Following the emigrant increasing and city population growth in the world especially in developing countries, the land use has special importance. Because by dedicating the land to essential uses, we can assure the major purposes in urban planning like: health, beauty, welfare, etc. In this research, we have tried to analyze and study the land use of Kazeroon city as the view point of quality and quantity, localizing and compatibility and concord then with popular standard per capita in urban plans.
The research method in current study is descriptive-analytical. Information needed for this research was obtained through field research, library research, interviews, map 1/2000 and map 1/25000 Kazeooun city. The data analysis was done by using AHP models and index overlaps in GIS medium. The results of this study show that only four cases of these uses have per capita higher than standard level. But other uses have special shortages and among them, transportation and warehouse and green land uses have some problems from the view point of quality like: spatial distribution, desirability, compatibility etc. with, regard to per capita shortage in existing condition (1385) and also population prediction for time horizon of 1400, the essential area for each uses in existing condition and in year 1400 have been evaluated and the suitable limits to make new uses presented.
