Document Type : Research Paper
Authors
1 MSc Student, Sciences and researches Unit, Islamic Azad University, Iran,
2 Assistant Professor, Sciences and researches Unit, Islamic Azad University, Iran
Abstract
The purpose of this study is to test the efficiency of the Soil and Water Assessment Test (SWAT) and its applicability as a flow simulator, and using SWAT-Cup software and the SUFI2 algorithm as a means to calibrate and validate Tehran’s Latyan Dam upstream area. In order to test the efficiency of this model in simulating output discharge, by comparing Roodak hydrometric station simulation values situated at the exit of the area during an 11-year period (1997-2007), it was specified that the model did not perform well in simulating Bik discharges. Further on, at first, 21 effective flow parameters were entered into the SWAT-Cup software, which after analyzing sensitivity, 14 parameters were used for calibration and validation. Calibration was carried out for years 1997 to 2003, and validation was conducted for years 2007 to 2007. Different assessment indexes were employed to measure performance of the model in SWAT-Cup software and the SUFI2 algorithm, which indexes R2, NS, P-Factor, and R-Factor for the calibration period were 0.91, 0.88, 0.96, 1.79, and values for the validation period 0.92, 0.92, 0.9, and 1.54, respectively. Moreover, the Alpha coefficient for underground water, surface water delay coefficient, and soil outward density were recognized as the most sensitive parameters in output discharge.
Keywords
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