Abstract

Engineering and water resource management responses to hydrological variability depend on daily, monthly and yearly timeframes. Annual runoff volume and flows are significant for long-term decisions on planning water resources and regulatory programs. The objective of this study was to evaluate the average annual discharge and runoff volume derived from different time steps run by SWAT (Soil and Water Assessment Tool) as hydrologic simulator in order to explore the impact of different time step run simulations on yearly runoff yield. Three scenarios has been performed namely Annual (D), Annual (M) and Annual (Y). Annual (D) and Annual (M) are related with derived average annual flow from daily and monthly run simulations by SWAT. Annual (Y) is yearly simulation run via SWAT. The Nash-Sutcliffe (NS) coefficient, Mean Square Error (MSE) and ratio of the Root-MSE (RSR) on standard deviation of measured data during validation period were 0.73, 6.3 and 0.5 for Annual (D), 0.82, 4 and 0.38 for Annual (M) and 0.81, 4 and 0.38 for Annual (Y), respectively. Also, relative error (%) for validation period obtained 0.97, 0.35 and 0.33 for Annual (D), Annual (M) and Annual (Y) scenarios, respectively. The study concludes that Annual M and Annual Y scenarios obtained closer results in validation period. In regard to relative error for average runoff volume in each year over modeling period, Annual (D) scenario obtained highest contribution with shortest relative errors in comparison with the two other scenarios.

Keywords:

Annual flow , hydrology, water resources , water yield,

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