Geomorphology
mojgan entezari; shokoh Esteki; Hamide Gholamhaydari
Abstract
A major cause of landslide and relevant losses and fatalities is inappropriate land management, especially in mountainous areas and valleys. In this study, risk-vulnerability superimposed model was used to investigate the probability of occurrence of fatal landslides in Tarom Watershed. The risk-vulnerability ...
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A major cause of landslide and relevant losses and fatalities is inappropriate land management, especially in mountainous areas and valleys. In this study, risk-vulnerability superimposed model was used to investigate the probability of occurrence of fatal landslides in Tarom Watershed. The risk-vulnerability superimposed model has been formulated to evaluate the landslide risk and vulnerability. These factors include topography, geology, number of streams, rainfall, frequency of faults, land use, density of roads, population density, and construction density, which were considered and analyzed in the present model. According to the model output (i.e., risk-vulnerability map), it was figured out that the eastern and northeastern parts of Tarom Watershed are exposed to highest levels of risk and vulnerability. That is, occurrence of a fatal landslide with financial losses is more probable in these areas, as compared to other parts of the watershed. Results of the present research showed that 17%, 35%, 23%, 16%, and 9% of the entire watershed area were classified as being exposed to very low, low, moderate, high, and very high risk-vulnerability levels, respectively. Advantage and superiority of this model over other models and methodologies for landslide study is simultaneous consideration of landslide occurrence risk and vulnerability of the study area to the landslide, making it capable of determining the areas of higher probability of fatal landslides with financial losses.
Mohammad Hossein Ramesht; Alireza Arab Ameri
Volume 17, Issue 45 , November 2013, , Pages 69-96
Abstract
Iran has a dry land with very small amount of precipitation so that its average rainfall is less than one third of average rainfall in the world. Nowadays, with increase in population demand for food increased. Therefore, utilization of water resources extended much more than the past. This amount of ...
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Iran has a dry land with very small amount of precipitation so that its average rainfall is less than one third of average rainfall in the world. Nowadays, with increase in population demand for food increased. Therefore, utilization of water resources extended much more than the past. This amount of consumption was more than the amount of ground water resources. In other words, input source become less than output. Therefore shortage of ground water resources should be compensated through artificial recharge of ground water resources.
The purpose of this study is zoning watershed for artificial recharge ground water. The analytic hierarchy process (AHP) is one of the most efficient techniques designed to multiple criteria decision making. This technique allows formulation of complex issues as hierarchy and also provides the possibility to consider various quantitative and qualitative criteria in question. To ensure the final results, potential layer of study area was provided in raster calculator, weighed overlay and weighted sum methods. The results show that among the three methods mentioned above raster calculator method allocated the maximum of area to high potential against weighed overlay that allocated the minimum area. But the weighted sum method is between the two methods and results of its confidence is higher. Among these, zones with highest potential are based on more coarse alluvial sediments and most areas with the highest density and zones with lowest potential both coincide with highest altitutes with the lowest penetration and steep slope and the low areas with high density of gypsum deposits and high rate of evaporation and temperature. The results of this study can be used in environmental management of groundwater resources and also the fruitful exploitation of optimal design of water resources and prevention of over exploitation of which can be productive.
Mostafa Golchin; Masood Jalali
Volume 17, Issue 45 , November 2013, , Pages 183-202
Abstract
Iran has a dry land with very small amount of precipitation so that its average rainfall is less than one third of average rainfall in the world. Nowadays, with increase in population demand for food increased. Therefore, utilization of water resources extended much more than the past. This amount of ...
Read More
Iran has a dry land with very small amount of precipitation so that its average rainfall is less than one third of average rainfall in the world. Nowadays, with increase in population demand for food increased. Therefore, utilization of water resources extended much more than the past. This amount of consumption was more than the amount of ground water resources. In other words, input source become less than output. Therefore shortage of ground water resources should be compensated through artificial recharge of ground water resources.
The purpose of this study is zoning watershed for artificial recharge ground water. The analytic hierarchy process (AHP) is one of the most efficient techniques designed to multiple criteria decision making. This technique allows formulation of complex issues as hierarchy and also provides the possibility to consider various quantitative and qualitative criteria in question. To ensure the final results, potential layer of study area was provided in raster calculator, weighed overlay and weighted sum methods. The results show that among the three methods mentioned above raster calculator method allocated the maximum of area to high potential against weighed overlay that allocated the minimum area. But the weighted sum method is between the two methods and results of its confidence are higher. Among these, zones with highest potential are based on more coarse alluvial sediments and most areas with the highest density and zones with lowest potential both coincide with highest altitutes with the lowest penetration and steep slope and the low areas with high density of gypsum deposits and high rate of evaporation and temperature. The results of this study can be used in environmental management of groundwater resources and also the fruitful exploitation of optimal design of water resources and prevention of over exploitation of which can be productive.
