Keivan Khorrami; Ghorban Vahab Zadeh; Karim Soleimani; Reza Talaei
Abstract
The use of groundwater is one of the ways to overcome the seasonal shortages of water.Underground dam that can be noted as one of the techniques to help the improvement of water resources management and increase the efficiency of these resources, is one of the water storage practices to use the groundwater. ...
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The use of groundwater is one of the ways to overcome the seasonal shortages of water.Underground dam that can be noted as one of the techniques to help the improvement of water resources management and increase the efficiency of these resources, is one of the water storage practices to use the groundwater. . It is a simple method for the collection and storage of water in arid and semi-arid areas. In this study, selection of suitable areas of underground dam in Gharasou watershed is investigated. Many factors are influenced in determining the suitable areas of underground dam. In this research, physiography, geology, hydrology, hydrogeology and land use of the watershed were investigated and analyzed with the use of information, maps, reports, required data and geographic information system. Then, derived maps from different stages were combined and finally suitable areas and streams for construction of underground dam were mapped. Results showed that about 30 percent of Gharasou watershed is suitable for construction of underground dam.
Payam Ebrahimi; Karim Soleymani; Kaka shahedi
Abstract
Neka watershed is associated with a large number of floods from the past, and had irrecoverable damages. Land use and its changes is one of the most important factors in country planning and policy making. In this research, land use map of year 2000 was prepared for Neka watershed by ETM+ images of 2000 ...
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Neka watershed is associated with a large number of floods from the past, and had irrecoverable damages. Land use and its changes is one of the most important factors in country planning and policy making. In this research, land use map of year 2000 was prepared for Neka watershed by ETM+ images of 2000 and IRS 1D images of 2011 based on digital processing of maximum probability in ENVI environment. Then, 2 km path upstream to Neka city was entered to GIS environment by 1:1000 scale plane maps and creating regional TIN and HEC-geo-RAS attachment. Finally, all data were imported to HEC-RAS software and flooding zonation was determined based on determination of roughness coefficient for two, three, five, 10, 20, 50, 100 and 200 return periods with Cown method. Results demonstrated that agricultural lands, Useless lands and municipal lands have been increased by 2.27, 7.31 and 1.91 percent, and forest and rangelands have been decreased by 10.22 and 1.27 percent respectively. These changes caused an increase of 13.14 percent of flooding zone in year 2011 compared to year 2000.
