Abstract
The Latian Dam is one of the important drinking water resources of Tehran, and it also has a role in preventing the flood. It is very important to keep the quality of water and preventing the dam from filling. Considering the special aspects of RUSLE model, it was used for estimating the amount of erosion in the watershed of dam including the sub-basins: Jajrood River, Kond River and Afjeh River, and then compared with the actual values ​​measured. The results of modeling show that the degree of erosion is high because of steep slopes, lack of plant coverage. The results of modeling the amount of erosion in The Jajrood basin have been estimated about 1,524 ton/year, in Kond basin about 228.5 ton/ year, and in the Afjeh basin about 103.1 ton/year. By using the results of the water samples analyses, the amount of phosphorus entering the reservoir by the rivers were calculated. This research shows that, by using the proper coverage in the basin, the amount of sediment and phosphorus entering the reservoir, decreases considerably. Key words: Latian Dam, phosphorus, reservoir.
Highlights
Soil erosion can cause ecological changes in the region.With regard to the role of planning and study of human and natural changes in erosion, assessment and adaptation model applied to each region, it is important.Latian Dam watershed is one of the areas where soil erosion is serious; the study of soil erosion in the area, as one of the water sources of Tehran is very important, particular area, population expansion, land use changed faces (Water and Energy Center of Sharif University, 2003a)
Including research done in this area; Quantitative modeling of soil erosion using AHP (Analytic hierarchy process) in the watershed Latian (Maleki et al, 2011), evaluate the accuracy and efficiency of computer models II SEDIMOT in estimating runoff and sediment (Sadeghi, 1994), and the application and model evaluation
The result shows due to high slope and low vegetation in most areas, soil erosion is high
Summary
Soil erosion can cause ecological changes in the region.With regard to the role of planning and study of human and natural changes in erosion, assessment and adaptation model applied to each region, it is important.Latian Dam watershed is one of the areas where soil erosion is serious; the study of soil erosion in the area, as one of the water sources of Tehran is very important, particular area, population expansion, land use changed faces (Water and Energy Center of Sharif University, 2003a). Soil erosion can cause ecological changes in the region. With regard to the role of planning and study of human and natural changes in erosion, assessment and adaptation model applied to each region, it is important. Latian Dam watershed is one of the areas where soil erosion is serious; the study of soil erosion in the area, as one of the water sources of Tehran is very important, particular area, population expansion, land use changed faces (Water and Energy Center of Sharif University, 2003a). Human sewage entering the river increased risk of erosion and sedimentation, pollution and nutrients in the reservoir. Including research done in this area; Quantitative modeling of soil erosion using AHP (Analytic hierarchy process) in the watershed Latian (Maleki et al., 2011), evaluate the accuracy and efficiency of computer models II SEDIMOT in estimating runoff and sediment (Sadeghi, 1994), and the application and model evaluation. Geographic information systems (GIS) in the sub-basin Lavarak (Tahmasebipoor, 1995) and comparison of models
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