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The Investigation of the Sediment Yield Potential Using Hydro-Physical Method in the Drainage Basins (Case Study in Kardeh Drainage Basin-Iran)

3 Abstract: A set of factors have role in creating erosion phenomenon by interactions in each drainage basin that one or more factor (s) may affect on its increasing or its control according to the specific conditions. The purpose of this research is to assess the sediment yield potential and sediment yield percentage by using the hydro-physical model as well as to supply the sediment yield map of the drainage basin. Kardeh drainage basin is located in the north east of Iran in the Khorasan Razavi Province. To meet these purposes, first the basin studied was divided into seven hydrological sub-basins, then the different hydro-physical factors affect on basin (area, slope, vegetation, geology and hydrology) were evaluated using hydro-physical model. Thus potential coefficient and sediment yield percent of the sub-basin were estimated and compared with the sediment content calculated in the hydrometric stations. Results show that sediment yield estimated by hydro-physical model is close to the sediment yield calculated in the hydrometric stations. The calculation and estimation of the sediment yield in each sub-basin by this model it was recognized that sub-basin K (Sijoal) 2 has the highest sediment yield (164891.29 ton/year) and sub-basins K and K (Mareshk and Firouz Abad) have 57 the lowest sediment yield (43381.75 ton/year and 24628.17 ton/year, respectively). Thus, the sub-basin K is 2 more sensitive to the erosion and must be preferred in the management programs of drainage basin.