Climatology
Jaber Soltani; masoud ahmadi nik; Ahmad Ahmadinik
Volume 23, Issue 69 , December 2019, , Pages 127-147
Abstract
Reference evapotranspiration is one of the necessary parameters to determine crop water requirements and irrigation planning. Having accurate estimates of this parameter is essential for planning and managing of water resources. Several experimental models have been proposed to estimate evapotranspiration. ...
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Reference evapotranspiration is one of the necessary parameters to determine crop water requirements and irrigation planning. Having accurate estimates of this parameter is essential for planning and managing of water resources. Several experimental models have been proposed to estimate evapotranspiration. According to the spatial variability of climatic parameters, using remote sensing method that considers these changes is very favorable. Among the most widely used models that accurately estimate evapotranspiration using remote sensing, can be mentioned wavelet model. In this regard, the purpose of present study is to evaluate the accuracy of wavelet models to estimate the reference evapotranspiration using parameters derived from satellite images contains the Earth's surface temperature and amount of water vapor in the atmosphere. In this study, used atmospheric and satellite images data of four station contains Anar, Kerman, Rafsanjan and Shahrebabak to develop and evaluate wavelet models. In the first scenario, temperature, in the second scenario, atmosphere water vapor parameter and in third scenario, both parameters simultaneously was used as the model input. Results of this study showed that despite the high accuracy of models in different scenarios, the wavelet model use two-parameters, temperature and steam simultaneously (third scenario), with a coefficient of 90% compared to other models had the more accurate.
Gholamali Mozaffari
Volume 16, Issue 39 , May 2012, , Pages 129-150
Abstract
Abstract
The global warming process during the last century not only has affected meteorological elements, but it also affected onset and end of meteorological elements. For studying probability changes in time series of onset and end date of rainfall thresholds 0.1 and 0.5 mm and more in the country ...
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Abstract
The global warming process during the last century not only has affected meteorological elements, but it also affected onset and end of meteorological elements. For studying probability changes in time series of onset and end date of rainfall thresholds 0.1 and 0.5 mm and more in the country level and deciding on the kind and its direction, daily rainfall data during past 45 years (1962-2006) of 29 synoptic meteorology stations has been used. First, onset and end date of rainfall in Julius code has been implied. The homogeneity of time series was tested by run-test missing value and was constructed by auto-correlation. For distinguishing random data and trend, Mann-Kendal method was used. The type and commencement time trend was calculated and the changes were also calculated on daily basis with Mann-Kendal graphical test and moving average of 5 years. The findings of this research show that there are trends at onset and end date of rainfall in some stations. On the other hand, in some meteorological stations, onset date of rainfall shifted forward and end date of rainfall shifted backward and the rainfall period length in some stations has been decreased.
Climatology
Mohamad Saligeh; mohammadhosain naserzadeh; ali ghaffari
Volume 22, Issue 64 , September 2018, , Pages 129-147
Abstract
The mechanisms of climbing rainfall in different areas follow different patterns. Identification of those patterns can increase the environmental planning .The stability indicators which are known as instability indicators are relations through which we can study the amount of instability ...
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The mechanisms of climbing rainfall in different areas follow different patterns. Identification of those patterns can increase the environmental planning .The stability indicators which are known as instability indicators are relations through which we can study the amount of instability of convection of the atmosphere in any area for studying and predicting falls. These indicators are used for convection activities and basically are studied by thermodynamics diagrams and Radio sounds data. The main aim of this paper is studying the chronological features of precipitations over 5 mm .and determining convection precipitation parts of Tabriz spring station based on higher layers of atmosphere . the Tabriz station precipitation data were received from the weather organization cartulary regarding the 35 – year statistic periods and precipitation data for over 5 mm .were chosen while the time frequency was studied . After choosing the samples, the skew – T diagrams of precipitation days inadittion to the instability indicators such as (LI -TT – SI – KI – PW - CAPE)were analyzed . The processing of these data in seasonal scale indicate a frequent happening of those instabilities. The maximum occur once of the precipitations for the April with 131 frequency cases and minimum of this precipitator is in June with 35 cases were observed .The results of drawing skew – t diagrams and measuring the instability indicators show that the role of convection factor is important in spring precipitations because the convection factor is only the main factor not only the amount of convection is critical but also the needed instability for rain is provided. In general, after studying 263 rain samples in spring , it turned out that the convection factor has the most important role in rain occurrence in May and June and the hazards of flood threaten the area .
Geomorphology
mohammad mahdi hosein zadeh; somaiyeh khaleghi; milad rostami
Volume 23, Issue 67 , April 2019, , Pages 129-149
Abstract
River channel change, bank erosion and bank sedimentation are natural process of alluvial rivers that cause destruction of agricultural lands and destroyed of structures around the river bank. The aim of this research is estimation of bank retrogression rate and bank erosion in Galali river (the reach ...
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River channel change, bank erosion and bank sedimentation are natural process of alluvial rivers that cause destruction of agricultural lands and destroyed of structures around the river bank. The aim of this research is estimation of bank retrogression rate and bank erosion in Galali river (the reach between Galali and Shirvaneh village) due to assessment of changes and estimation of potential changes in frequency of bank failures (Safety Factor) and sediment load from the river bank in two different scenario and 12 hours and three reaches by BSTEM model. The big floods can be caused bank erosion in this river and this issue is so important because there are some dams have been constructed in downstream of this river so estimation of erosion and sediment load is very important. Results show that total eroded areas in first scenario are 0.244, 0.372 and 0.054 m2 in reaches 1, 2 and 3 and the total eroded areas in second scenario are 0.272, 0.1 and 0.054 in reaches 1, 2 and 3 respectively. According to bank stability and safety factor, all of three cross-sections are unstable in first scenario and safety factor is less that 1 but safety factor increase in second scenario so that safety factor is around 1 in reaches 1 and 2 and in reach 3 is more than 1. Therefore, by protection works on the erodible banks can be reduced the total volume of the sediment load from eroded bank.
Geotourism
kiuomars khodapanah
Abstract
IntroductionNowadays, the tourism industry is one of the most significant and diverse industries in the world that was developed rapidly and provided considerable income resources for many governments. Nowadays, the sustainability paradigm emerges as a significant and essential issue and has attracted ...
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IntroductionNowadays, the tourism industry is one of the most significant and diverse industries in the world that was developed rapidly and provided considerable income resources for many governments. Nowadays, the sustainability paradigm emerges as a significant and essential issue and has attracted the attention of the global communities in recent two decades. One of the components considered for reaching a sustainable development is resilience, and nowadays, the experience of the occurred crises and their resulted imposed damages makes the human being realize the need for resilience and making resilient settlement areas. Therefore, the prevailing perspective has changed from mere reducing vulnerability to increasing resilience when facing disasters. On the other hand, the touristic villages are prone to the damages resulting from these developments besides having potential factors in line with the tourism and development due to having tourism potential, and in some cases, due to the low resilience and being tourist-friendly besides the risks caused by the lack of the resilience have affected the villagers’ lives. Thus, due to tourism development, resilience must be considered in tourism villages to reduce the risks caused by the occurrence of the possible damages. Therefore, investigating the resilience of these villages can play a significant role in the development of sustainable tourism in them. Tourism villages of the Ardebil area are one of the tourism villages of the province and have the capability for sustainable tourism development. Thus, investigating the resilience of these villages can play an essential role in the sustainable tourism development within them. According to the abovementioned and the effects of the tourism development on the resilience of the rural regions, the current study was conducted to evaluate and assess the resilience of the target villages for tourism in the Ardebil area and sought to answer the following question: what is the level of the resilience of the target villages for tourism in Ardebil area?Data and Method The current research was descriptive-analytical in terms of the nature of the research problem and subject. The statistical population of the current study included 11 target villages for tourism in the Ardebil area with a population of 4278. The data collection method to answer the research questions was the library study and the questionnaire. Four aspects, 10 indicators, and 33 items were used to assess resilience. Multivariate regression analysis was used to analyze the distributed questionnaires, and the one-sample t-test was used to study the effect of the independent variable on the dependent variable and villagers’ opinions on the indicators of resilience. MAIRCA decision-making technique was used to rank the villages. Results and Discussion The one-sample t-test was used to study the resilience status of the target villages four tourism in four aspects. The overall results of the one-sample t-test indicated an average of 2.13 for the resilience status of the villages under study. Given that the observed average of the resilience of the villages was less than 3, which is the medium level of the Likert scale, it can be said that the overall status of the resilience in the villages under study was evaluated as the low level of resilience. According to the obtained results from the one-sample t-test presented in Table 3, the following average values were obtained: 3.42 for the social aspect, 2.31 for the institutional aspect, 22.27 for the physical aspect, and 1.85 for the economic aspect. The significance level of all indicators was lower than the error level of 0.5. However, the t-value was lower than the critical value of 1.96 in the institutional aspect, and the upper limit and lower limit were negative. Furthermore, the average of the social aspect was more than 3, the desirable limit. Therefore, it can be said that the social aspect was at a more desirable status according to the villagers’ opinions. Nevertheless, other aspects are not at a desirable level, which is effective in reducing the resilience of the villages under study according to villagers’ opinions.ConclusionIn general, the findings of this research by investigating the resilience status of the target villages for tourism in the Ardebil area, according to the results of the one-sample t-test, indicate that the overall status of the resilience was not desirable. They also indicate the poor resilience and low tolerance of the tourism villages in dealing with the issues caused by the major presence of the tourists at peak conditions of traveling. The overall results of the one-sample t-test indicated an average of 2.13 for the resilience status of the villages under study. Ranking 11 villages under study based on MAIRDA decision-making technique shows that Alvaresi Village and Aladizgeh Village ranked first and second, respectively, based on the score (Q) and are considered total resilient than other villages of the region and have more resilience against the increase in the needs of the village due to the entrance of the tourists. Atashgah, Golestan, Villa Darreh, Ilanjough, Kalkhvoran-e Viyand, Ghareshiran, and Sardabeh villages have relatively low resilience. Kanzag and Kur Abbaslu villages ranked the last in the rural resilience based on the set of the indicators understudy in the current research and are considered in the class of “lack of resilience”.
Urban Planning
SHahrivar Rostaei; Sonya Karami
Abstract
Housing is greatest asset of family, especially in third world countries. Since each economic source brings power of social and political, possess of housing and housing ownership brings also the many benefits. This benefits when becomes notable that granted to a group of people who were deprived of ...
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Housing is greatest asset of family, especially in third world countries. Since each economic source brings power of social and political, possess of housing and housing ownership brings also the many benefits. This benefits when becomes notable that granted to a group of people who were deprived of this benefits and this group is same women who percent of housing ownership for their show very low rate than men. Because of the importance of this issue for women, in this study we examine the impact of housing ownership on the participation of urban women. This study in terms of nature is Descriptive-Analytical and in terms of target is an applied research. Research method is gauging and 300 persons have been selected by simple random sampling. The statistical method used is including Kendall correlation and path analysis. The results show that impact of housing ownership on the participation is more of its impact on their decision independence, also housing ownership has indirectly affects on women participation.
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.
Rural Planning
ahmad roumiani; Tahere saddlebag; Soroush Sanaei Moghaddam
Volume 23, Issue 68 , September 2019, , Pages 135-156
Abstract
Public places in villages are belonging to all the people and they are built to provide needs of having relationship among people. That’s why nowadays these kinds of places must have a great role in planning of rural areas and by that they would be able to improve the level of happiness and wealth ...
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Public places in villages are belonging to all the people and they are built to provide needs of having relationship among people. That’s why nowadays these kinds of places must have a great role in planning of rural areas and by that they would be able to improve the level of happiness and wealth among people in all economic, social, cultural and environmental aspects. Therefore, the main abject of this project would be analyzing the needs of the people from this kind of public places in the study area. Research method is of descriptive-analysis based on field research and observations and it’s a functional project. Statistic community is habitants of Dehdasht gharbi of kohkilouye province which includes over 1460 households in the region. Among these 1460 families we chose randomly 226 samples using Cochran formula with 0.06 percent risk of error. For analyzing data, we have used freedman and correlation tests. The results of the freedman showed that indicators; comfort, pleasure and conservation have allocated themselves the most part of the periodization with amounts of 7.26, 4.90 and 3.78 respectively. On the other hand, results of the multiple regression tests showed that most of the correlation is between environmental skeletal and social vitality with amount of 0.372 and 0.275 respectively and these indicators have had great influence on other indicators as well.
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.
Daryosh Rahimi; Seayed Hojat Mosavy
Volume 17, Issue 44 , September 2013, , Pages 139-159
Abstract
In recent decades, growing trend of Shahroud city has implied the strategy of groundwater resources management in the region more than before. One of the strategies of water resources management is the identification of zones with various potential and utilization from them with attention to their capacity. ...
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In recent decades, growing trend of Shahroud city has implied the strategy of groundwater resources management in the region more than before. One of the strategies of water resources management is the identification of zones with various potential and utilization from them with attention to their capacity. The aim of this study is the zoning of Shahroud-Bastam basin using effective factors in nutrition of groundwater through AHP model and GIS technique. To achieve the goals, we used geology, climatology, geomorphology and hydrology criteria. We recognized five potential areas such as high, good, moderate, low and no potential regions. Finally, to ensure final results, potential layer of study area was prepared by three ways of raster calculator, weighed overlay and weighted sum. The results show that among five defined zones, area maximum and minimum of high potential zones have been given in the first and second methods, respectively. But the third method is between previous methods, and its results have the higher reliability. The zones with high potential are coincident on coarse alluvial deposits of Quaternary era and alluvial fans. The zones with no potential are coincident with the maximum elevation areas having clay and marl depositions. The results of this research can be fruitful in plans of environment management of groundwater resources and preventing from -overexploitation of their power.
Javad Khoshhal; Abbasali Vali; Moahsen Pourkhosravani
Volume 16, Issue 42 , March 2013, , Pages 139-153
Abstract
Attention to agricultural production capabilities in every region is related to climatic characteristics, so study on the climatic parameters is very important. This study evaluates for assessment the effect of wind on crop conditions and optimizes the amount of crop conditions by wind break on wheat ...
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Attention to agricultural production capabilities in every region is related to climatic characteristics, so study on the climatic parameters is very important. This study evaluates for assessment the effect of wind on crop conditions and optimizes the amount of crop conditions by wind break on wheat in Mohammad Abad in Esfahan. For assessment of changes that are resulting from carminative agronomic Traits of Wheat include: grain weight, number of grains per spike, spikes per square meter, grain yield, biological yield and percentage resting form a complete random design treatments. Distance carminative height was evaluated. Analysis of variance showed significant difference in the level of 1 percent for grain weight, yield and resting percent and 5 percent levels for biological yield and grain number per spike showed. Test to compare mean grain weight, number of grains per spike, spike in m², grain yield, biological yield and percentage resting treatments at different levels indicated significant differences in the averages of each trait in each treatment. Test results compare mean grain weight, number of grains per spike and grain yield indicate a trend similar to the distance from carminative are interactively with increasing distance from the windbreak to 5 times the height of all traits increase. So that significant differences between their control and this is evident from the values of these traits point to reach their maximum and then with increasing amounts of their distance decreases and amounts to 15 times the height of the traits seen carminative without significant difference. For the adjective percentage resting contrast crop plant performance has done so, these traits also influenced by distance are carminative. But the spike in m² and biological function are not affected of distance from the windbreak
Mosa Abedini; Hasan Setayeshi Nesaz
Volume 18, Issue 49 , November 2014, , Pages 139-165
Abstract
Zoning of Landslide hazards is one of the ways that used to determine critical areas. Landslide zoning maps can also be utilized in environmental planning to reduce damage. In the present article, the AHP has been applied to the Gollojeh basin located in Zanjan province. The most important factors in ...
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Zoning of Landslide hazards is one of the ways that used to determine critical areas. Landslide zoning maps can also be utilized in environmental planning to reduce damage. In the present article, the AHP has been applied to the Gollojeh basin located in Zanjan province. The most important factors in landslide occurrence in this study basin were identified as: geology formation, slope%, land use, height and distance from river, slope aspect, rainfall and faults. After layering and assigning weights to them the final map was produced in Arc GIS .The final results from this study show that the weight of the nine criteria respectively: are 0.4092, 0.2485, 0.1439, 0.0786, 0.0479, 0.0309, 0.023, 0.0181 with geology and faults having the greatest and last weights. Finally the landslide map denoting in four domains at very high risk, high risk, medium risk and low risk was prepaerd.
Climatology
Kamran Zeinalzadeh; Neda Khanmohammadi
Abstract
Reference evapotranspiration (ET0) is one of the important factors to determine crop water requirement. Accurate estimation of reference evapotranspiration (ET0) value has a very important role in water resources management and optimizing agricultural water consumption. In other words, calculating the ...
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Reference evapotranspiration (ET0) is one of the important factors to determine crop water requirement. Accurate estimation of reference evapotranspiration (ET0) value has a very important role in water resources management and optimizing agricultural water consumption. In other words, calculating the accurate values of this parameter plays an important role in irrigation planning and consequently existent water resources management.
Asghar Zarrabi; Raheleh Saniei
Volume 16, Issue 40 , September 2012, , Pages 141-159
Abstract
Vulnerability of cities for earthquakes argue is a topic that is urban planning experts.
This subject has variety of aspects such as stability and by instability of structural material. It's relation with humanities indexes is studied as urban planning hidden sector and the planning ignoring it will ...
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Vulnerability of cities for earthquakes argue is a topic that is urban planning experts.
This subject has variety of aspects such as stability and by instability of structural material. It's relation with humanities indexes is studied as urban planning hidden sector and the planning ignoring it will fail. Purpose of this research, is the determination of humanities indexes which affect on urban area stability and instability of structural material in Iran states.
Therefore, this research has used analytic and quantitative methods. At first, stability and instability of structural Material were calculated by SDI method. In this method Iran states were divided in to four parts including Mazandran, Ilam, Esfehan, Gilan, Markazy, Kohkilooye and Boyer Ahmad and Tehran as developing states. In the second step, by using factor analysis 90 factors are reduced to 11 effective factors. Regression model detected that first, fourth; seventh and ninth factors have the highest effects in developing material.
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.
Climatology
faride habibi; Mahboobe Firoozabadi; fatemeh zarei
Volume 22, Issue 66 , January 2019, , Pages 141-162
Abstract
This research is investigated the precipitation system which created the significant rainfall and flooding in the southern and southwestern of Iran on the 14 and 15th March 2014, with using Metar and Synop reports from the synoptic stations of southern provinces; and weather patterns such as: mean see ...
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This research is investigated the precipitation system which created the significant rainfall and flooding in the southern and southwestern of Iran on the 14 and 15th March 2014, with using Metar and Synop reports from the synoptic stations of southern provinces; and weather patterns such as: mean see level pressure - advections of humid, temperature at 1000, 850 and 500 hpa - the pressure tendency over 24 hours at 500 hpa; wind field at 1000 and 200 hpa - and jet stream at 200 hpa. This rainy system was compared with the system of March 1996, which it had the second largest maximum rainfall in this region during the past 58 years. The weather patterns of March 2014 are quite different from patterns of March 1996. The first case has been created by potential instability due to the dynamic low pressure, but the latter has been formed by the combination of Mediterranean low pressure and Sudanese low. Of course, the gradual meridianization of the strong sub-tropical jet stream in the northwestern part of Africa, and penetration of its branch over the Persian Gulf have helped to intensify the instability of these areas on the mentioned days.The Maximum 24-hour rainfall has been reported from Bandarabbas, Rudan and Kahnuj stations that their amount was respectively 110, 78.5 and 69 mm. Three stations located in the easterly flank of precipitation system where there was the abundant moisture nutrition from the Strait of Hormuz. The left exit region of sub-tropical jet stream was situated over the hormozgan province and caused the lifting air flow in the region. The sum of these factors have caused the maximum rainfall occurs in this province
Manochehr Farajzadeh; Saeed Rajaee Najafabadi
Volume 17, Issue 45 , November 2013, , Pages 142-162
Abstract
In this paper we study the heavy precipitation and probability of occurring flood as a result of it for Koohrang station. The synoptic and discharge maps were chosen and drawn in purpose of showing the discharge peak for 29 February by175 mm rainfall. In this day a low pressure center was located in ...
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In this paper we study the heavy precipitation and probability of occurring flood as a result of it for Koohrang station. The synoptic and discharge maps were chosen and drawn in purpose of showing the discharge peak for 29 February by175 mm rainfall. In this day a low pressure center was located in Greek. As this center expanded to the north, the thermal low pressure above the Sudan and Saudi Arabia became dynamic and stretched toward the west of Iran. According to the sea surface, 500 mb and moisture flow, this heavy rainfall was the result of the instability from surface to 500 geopotential levels and generated 5.7 m2/s discharges in the regain.
Afsaneh Abbassi; Hoshang Ghaemi
Volume 17, Issue 43 , October 2013, , Pages 145-168
Abstract
In this research five synoptic stations are selected including Mehrabad, Karaj, Gazvin, Ramsar and Noshahr. After analysis and processing of the parameters such as wind speed, dew point, pressure and storm coefficient data, PMP in continuation of 24 and 48 hours for related basin was estimated, in order ...
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In this research five synoptic stations are selected including Mehrabad, Karaj, Gazvin, Ramsar and Noshahr. After analysis and processing of the parameters such as wind speed, dew point, pressure and storm coefficient data, PMP in continuation of 24 and 48 hours for related basin was estimated, in order of 140/56 , 254/ 58mm. Considering resulted number and obtained flow in 1374/68 and 40% ronoff average daily flow we estimated 550 , which in comparison with the maximum daily flow in Siera (dam entrance) station with 20 years statistical period which is 154/54 for being acceptable. According to synoptic charts, three rainfall systems caused 24 hours Maximum precipitation turn in 48 hours.
Climatology
Nafiseh Rahimi; Saeed jahanbakhsh; Brooman Salahei
Volume 23, Issue 70 , March 2020, , Pages 145-167
Abstract
Strong winds are one of natural disasters that sometimes cause enormous Financial and physical damages. Since northwest of Iran and specially Ardabil Province is one of windy regions, this study tried to identify synoptic patterns which bring strong winds. Through considering equal and threshold wind ...
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Strong winds are one of natural disasters that sometimes cause enormous Financial and physical damages. Since northwest of Iran and specially Ardabil Province is one of windy regions, this study tried to identify synoptic patterns which bring strong winds. Through considering equal and threshold wind speeding over 28 knots per second, 783 days identified as wind crashing days in Ardabil province. Then by data component- based analysis of 500hPa geo-potential height of the 783-days detected seven components which explain 92% of variance. Finally by clustering seven components identified ten patterns as synoptic patterns that are responsible for Strong wind of Ardabil province. The survey of topographic arrangement of these patterns indicates the rise of trough and ridge levels to these patterns. This means that the patterns consists of, mainly, trough, ridge, or combination of both and aren’t observed other systems such as cut off, block systems, etc. Although mentioned systems may be observe in individual patterns of each of the 783 days, but the systems aren’t responsible for the dominance and influence. The temporal distribution patterns show that two patterns, 6 and 7which occurs in the summer, has a similar system at 1000 hPa level when it compares with other models which occur in winter, spring, fall. What's notable, reversal of location position of pressure systems, 1000 hPa, in two patterns of summer, so that a low pressure instead of high pressure is over the Zagros and a high pressure instead of low pressure is over the Caspian Sea.
Asghar Zarabi; Azam Safarabadi
Volume 17, Issue 46 , February 2014, , Pages 147-170
Abstract
Ecotourism or nature tourism is one of the branches of tourism that is based on natural attractions. Ecotourism industry includes strategies to identify areas of prone nature and the planning for these areas to attract ecotourists and create the infrastructure facilities for them. City of Kermanshah ...
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Ecotourism or nature tourism is one of the branches of tourism that is based on natural attractions. Ecotourism industry includes strategies to identify areas of prone nature and the planning for these areas to attract ecotourists and create the infrastructure facilities for them. City of Kermanshah is among regions with interesting scenery which enjoys rich cultural and historical attractions in the field of tourism. This study tries to evaluate the challenges and opportunities of nature tourism of this city using SWOT strategic model and to present appropriate strategies to achieve sustainable ecotourism for the region. It is a descriptive-analytical study and data collection is done using library, survey and documentary methods. The results of this study indicate that pristine nature and high ecotourism capabilities with a score of 0.45 and varied climate with a score of 0.32 are among the most important strengths. Lack of proper introduction of the region attractions with a score of 0.32 is the most important weakness. Job creation with score of 0.36 and visits management with a score of 0.28 are the most important opportunities and Lack of organized and studied programs with a score of 0.40 are the most important threats to the sustainable development in ecotourism of the area.
Shahrivar Roostayee; Akbar Asgari Zamani; Ali Zolfi
Volume 18, Issue 47 , April 2014, , Pages 149-169
Abstract
In this paper the importance and necessity of knowing the characteristics of the natural environment to identify suitable locations for buildings and municipal buildings from poor areas, zoning lands to the central part of Aras Free Zone, was acting for urban development. Six indicators (distance from ...
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In this paper the importance and necessity of knowing the characteristics of the natural environment to identify suitable locations for buildings and municipal buildings from poor areas, zoning lands to the central part of Aras Free Zone, was acting for urban development. Six indicators (distance from the fault, the Aras river privacy, water studied privacy, land formation, land erosion and slope) were considered and produced. After defining the parameters, according to the research using AHP, by weighting each indicator in ArcGIS software capabilities in order to combine the indicators. The zoning map for urban development was obtained and evaluated. The results indicate that the most desirable locations for urban development based on the distance from natural hazards zones are in the South, South west and West regions where 4762 ha of area were allocated. Meanwhile in 2300 ha of land area, land for urban development was not desirable.
Davood Mokhtari
Volume 16, Issue 37 , November 2011, , Pages 151-172
Abstract
Geo-hiking tourism, which combines sport activities and appreciation of geological-geomorphological aspects of nature, is today one of the main recreational and economic activities among the markets which will experience a great increase in the near future. This paper presenting Payam Pass in northwest ...
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Geo-hiking tourism, which combines sport activities and appreciation of geological-geomorphological aspects of nature, is today one of the main recreational and economic activities among the markets which will experience a great increase in the near future. This paper presenting Payam Pass in northwest of Iran (38°17′05″-38°55′52″N and 45°46′13″-45°59′12″E) as a geomorphosite, illustrates a methodology to develop a thematic map, namely, the “geo-hiking map”. These maps emphasize the landscape elements that the tourist can recognize and observe, as well as the possible hazards. PayamPass has a strong geo-hiking-tourism vacation merit (its spectacular high-mountain landscape, dense network of hiking tracks, springs, winter sports possibilities, country climate). Thus, the study area shows geomorphological hazard levels of mass wasting, snow and rock avalanches, and aggradational and deggradational activities of rivers. The results emphasize and propose for the people in charge and planners to provide the geo-hiking maps for all gomorphosites of Iran. This study could represent an important instrument for a responsible and safe utilities of high-mountain tourist areas.
Geotourism
farnoush khorasani zadeh; hamid saberi; mehdi momeni; mienajaf mousavi
Abstract
Intoduction Vitality is the desire of citizens to be active and dynamic in urban environments, which makes urban spaces more prosperous and crowded and increases the presence of citizens in public spaces. So far, little attention has been paid to the vitality of urban environments in studies, research ...
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Intoduction Vitality is the desire of citizens to be active and dynamic in urban environments, which makes urban spaces more prosperous and crowded and increases the presence of citizens in public spaces. So far, little attention has been paid to the vitality of urban environments in studies, research and design projects of new cities in Iran. Cities are considered to be the most important political, technological, artistic, cultural and social fruits of human beings, and urban spaces of cities are the most important parts that shape the city. In the meantime, it is important to pay attention to the psychological and physical well-being of human beings. The development of today's cities has generally sacrificed this point for its physical growth and development. Today, one of the most important concerns in designing public spaces in the city is the vibrancy of these places, which continues the presence of citizens. Variety of uses can be mentioned as one of the most important factors in attracting people to this place, but at the same time, this factor alone cannot cause vitality and dynamism of the space. Other factors influencing the vitality of an urban space include cultural, social, and environmental factors. Methology The present research is descriptive in terms of practical purpose and analytical in terms of nature and descriptive method. Analysis has been used using descriptive statistics and inferential tests (T-test and analysis of variance) and differences and correlations between indicators using structural equation model.The statistical population of this study includes all citizens living in 4 regions of Isfahan, which according to the 2016 census, was 452453 people. The Cochran's formula was estimated to be 95% reliable with a sample size of 584 people. The statistical sample of the study is half of the residents and half of the tourists in the period of January 1996 to June 1997 present in the public spaces of 4 areas of the 15 districts located in the central part of the city and most tourists use these places as territory. Results and discussion Given that with improved security, and physical identity and attractiveness, vitality also improves. To measure the difference between the two independent groups of citizens and tourists on the average of a (quantitative) livability variable, the T test was used with independent samples. The results showed that the statistical value of t to compare the rate of vitality in public spaces in central Isfahan from the citizens' point of view. Tourists are equal to -0.630, and the probability of their significant study is 0.0529, which is higher than 0.05, so with 0.95 confidence, zero statistical assumption that the rate of vitality in public spaces is equal. Central Isfahan is approved from the point of view of citizens and tourists. As a result, the average livelihood is the same for citizens and tourists. Conclusion Vitality is the tendency of citizens to be active and dynamic in urban environments, which makes urban spaces more prosperous and crowded and increases the presence of citizens in public spaces. Vitality is one of the most important constructive qualities of urban spaces to improve the quality of urban spaces and create space.The descriptive and inferential results of the research have been analyzed using SPSS and AMOS software and the results of the hypothesis test showed that based on the results of the structural equation model, the effect of security on vitality is 0.221 and this coefficient has a significant effect . (Coefficient t is greater than 1.96) so the first hypothesis is confirmed. This means that with improved security, vitality also improves. The effect of identity on vitality is 0.854, and this coefficient has a significant effect (coefficient t more than 1.96), so the second hypothesis is confirmed. This means that with the improvement of identity, vitality also improves. The effect of physical attractiveness on vitality is 0.170 and this coefficient has a significant effect (coefficient t is more than 1.96) so the third hypothesis is confirmed. This means that as physical attractiveness improves, so does vitality. The level of vitality in public spaces in the central areas of Isfahan is confirmed from the point of view of citizens and tourists. As a result, the average livelihood is the same for citizens and tourists.
Yaghoob Zanganeh; Yaser Shamsolahzadeh
Volume 16, Issue 41 , November 2012, , Pages 153-168
Abstract
During the few recent decades one of important subjects that connected studies of tourism and has been in the center of researcher’s attention, and an image of tourist from a tourism destination. Most results of these researches indicated that mental image of tourists from a destination influences ...
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During the few recent decades one of important subjects that connected studies of tourism and has been in the center of researcher’s attention, and an image of tourist from a tourism destination. Most results of these researches indicated that mental image of tourists from a destination influences decision making to travel, their behavior during trip and intended renewed trips to that destination. Despite importance of this concept in development of tourism industry, with the exception of a few cases (e.g, in the case of foreign tourists), destination image subject has not been explored in Iran. The main purpose of this research is the examination and analysis of image of interior tourists before and after travel to Tabriz. Methodology of this research is surveying. Required information was gathered using questionnaires and then analyzed with statistical methods by SPSS software. The findings of this study show that travel to Tabriz city has had positive effect on tourist’s image from this city. There has been also positive correlation between tourists image after travel to Tabriz and their tendency to renewed travel to this city. The important point relative to sources is that tourists obtain information of travel by traditional methods (through friends and family members) before traveling to this city.
Swywd Hossein Mirmousavi; Mina Mirain
Volume 16, Issue 38 , February 2012, , Pages 153-178
Abstract
Ggiven that assessment data often point to be made, are necessary to generalize to the entire region, Interpolation operation have been done on areas of precipitation. In this study using Kriging and inverse weight method, interpolation of rainfall in KermanProvince has been attempted. For this purpose, ...
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Ggiven that assessment data often point to be made, are necessary to generalize to the entire region, Interpolation operation have been done on areas of precipitation. In this study using Kriging and inverse weight method, interpolation of rainfall in KermanProvince has been attempted. For this purpose, the monthly rainfall statistics for 9 synoptic stations in Kerman province and 11 synoptic stations neighboring provinces have been used.
The results of this study indicate that Kriging method with lower error levels is more appropriate for the interpolation of rainfall in this region. Models based on fitted Semivariogram models, Spherical, linear and exponential models provide better facilities for the preparation of a precipitation isomap. Between models in the spherical model for the months January to June and also in December, the exponential model for the month of July and the exponential model for the months August to November show the most appropriate change model views that are detected. Based on maps prepared for different months, while the highest rainfall occurred in winter time change the amount of the highest range 42-13 mm in the season. Spatial gradients of changes in precipitation decrease trend are from south to north. Other seasons in the low average range of precipitation changes also showed no significant fluctuations.
