Soil is an integral part of the environment. It is essential for the production of food and other crops, for maintaining biodiversity, for the landscape and sustainable development. Lack of necessary data relating to erosion, sediment and unavailability of Sediment Delivery Ratio (SDR) for almost all of the watershed basins of Iran is considered as one of the main problems that cause to improper watershed management planning in the country. Due to the availability of sediment data or simplicity of sediment measurement in watersheds, while measurement of erosion is more difficult than sediment, having or knowing the amount of SDR can be a usable tool for estimation of erosion rate in any watershed. Therefore, for choosing the most suitable SDR estimation model, seven of common models were selected based on the results of their usage in the world and in some watersheds of Iran and applied in Ilam dam basin. Results of the study indicated that Williams Berndt [28] is the most suitable model for estimation of SDR in Ilam dam basin with the least absolute and Standard Errors as well as the least Coefficient of Variation (C.V) equal to 0.05, 5.7% and 6.6% respectively.
کلید واژگان :Erosion, sediment, SDR, Williams - Berndt model, Ilam dam basin
ارزش ریالی : 600000 ریال
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