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.
Tooraj Asadi; Seyed Saber Shahooei; Mohammad Asadi; Amir Mansour Shahsavar
Abstract
Due to the importance of water erosion in reducing soil fertility many studies have been done on the quantity of this destructive phenomenon. Tamura and Rogowosky found a meaningful relation between water erosion and Cs-137 loss in soil matrix. This report was the first of application of Cs-137 method ...
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Due to the importance of water erosion in reducing soil fertility many studies have been done on the quantity of this destructive phenomenon. Tamura and Rogowosky found a meaningful relation between water erosion and Cs-137 loss in soil matrix. This report was the first of application of Cs-137 method to estimate soil erosion since 1974. From 1974, the method has changed gradually and now is used in many studies. In this study,aerial photographs with scale of 1:20000 and topographic maps with scale of 1:50000 were used. 12 transects on the hilly lands (compound and uniform slopes) and 3 transects on the piedmont plain were studied. Surface samples were collected from different slope situations. The situations were collected from different slope situations.The situations were summits, shoulders, back slopes, foot slopes and toe slopes; gamma spectrometer was used to determine the Cs-137 of the samples. Soil erosion and sediment were calculated by Cochanouski (1993) Equation. Results showed that in summit, shoulder and back slope of the compound slopes, erosion is 68.42, 45.46 and51.16 Ton/ha/yr respectively. On the same situations of uniform slopes 79.6, 65.3 and 84.23 ton /ha/yr of soil losses were expected. In non-erosional situations (toe slopes), soil loss has been deposited. In foot slopes, i.e. dynamic sites, sedimentation process is more dominant than destructive ones. The correlation between USLE and Cs-137 models were statistically signification with % 95 probability.
