Hydrogeomorphology
Mohammad Mehdi Hosseinzadeh; Ali Reza Salehi Milani; Fateme Rezaian Zarandini
Abstract
Floods, as natural and unexpected events, have occurred frequently in recent decades. To reduce the damages caused by floods and flood management, it is mandatory to assess the possibility of danger and prepare maps of possible danger zones. In recent decades, many destructive floods have occurred in ...
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Floods, as natural and unexpected events, have occurred frequently in recent decades. To reduce the damages caused by floods and flood management, it is mandatory to assess the possibility of danger and prepare maps of possible danger zones. In recent decades, many destructive floods have occurred in the Nakarod catchment. Because of this, to manage floods, reduce damages, and properly use water resources, the flood potential of the sub-basins of the Nakarod catchment has been studied. Neka River is 176 km long, and it is one of the important rivers of Mazandaran province and one of the catchments of the Caspian Sea. In this research, to prepare a map of the sensitivity of the sub-basins to the flood risk of the basin, 11 influencing parameters have been used, which includes elevation, slope, distance from drainage network, drainage density, flow accumulation, rainfall, land-use, geology, stream power index, topographic wetness index and curvature of the topography. The layers were weighted using the Analytical Hierarchy Process (AHP); and eventually, by using the weighted linear combination method in ArcGIS software, the standardized layers were multiplied by the corresponding weight, and then the results of all the variables were added and accumulated together, and the final sensitivity map was divided into five classes. The results of the research indicate that flood sensitivity is different in the sub-basins of the Neka RiverAmong the effective environmental factors in flooding, the elevation and stream density were the most influential factors in the flood risk of the Neka catchment.
Mohammad Saeidi; Mehdi Komasi; Shahab Hasanpor
Abstract
Over the past few decades, as a result, population growth, industrialization, urbanization, etc., demand for water has increased, most of these requirements have provided by exploiting groundwater resources. Therefore, the uncertainty in the demand and supply of water should be minimized by proper groundwater ...
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Over the past few decades, as a result, population growth, industrialization, urbanization, etc., demand for water has increased, most of these requirements have provided by exploiting groundwater resources. Therefore, the uncertainty in the demand and supply of water should be minimized by proper groundwater management, by identifying areas with groundwater potential. In this study, it has been attempted to find the potential groundwater resources in Silakhor plain using combined Analytical Hierarchy Process (AHP) and fuzzy TOPSIS method in GIS environment. In this regard, eleven thematic layers including layers of lithology, rainfall, vegetation cover, lineament density and distance, elevation, slope, land surface temperature, land use and drainage density and distance were prepared based on satellite image processing and statistical data, used to create a groundwater resource potential mapping. Groundwater resource potential map was classified into five categories including high, good, medium, low and very low potential. Accordingly, the high to moderate potential sites are located more in the center and southwest of the plain and correspond to quaternary alluvial and carbonate hard rocks zones. Validation was done by the number of wells in the area and the results indicate that the use of an integrated approach AHP and Fuzzy TOPSIS methods in groundwater potential mapping with the location of the wells is in good agreement, about 87% of the wells are located in areas with moderate to high groundwater potential.
