عنوان مقاله [English]
According to intensifying soil erosion on the Balekhli river Watershed sediments transport to the Yamchi dam are increasing. This reduces the volume of the reservoir on one hand. In order to soil erosion risk zonation, drainage density, the highest daily of precipitation, soil, land use, geology, slope, elevation, profile curvature and plan curvature and fuzzy model. The results showed that about 42.16 percent of the study area was located in high and extreme high zones of soil erosion risk. These zones are located in plain, foothills, relatively high mountains, high mountains and very high mountains. 26.93 percent of the study area was located in average zone of soil erosion risk, and about 30.88 percent was located in relatively low and very low zones of soil erosion risk too. high and extreme high soil erodibility are due to drainage density, feebleness of some geological units in terms of erosion, the highest daily of precipitation more than 47 mm, landuse changing and topographic factors. Moreover, soil erosion morphology zones are followed by the morphology of drainage density. This indicating Balekhli River's role in eroding soil. It is necessary to do some Watershed management practices and soil conservation by the engineers of natural resources. The maps can be used by engineers Natural Resources and Watershed Management.