Study of changes in water resource components and sediment rates of Atrak Watershed before and after the Shirin dareh dam Building Using SWAT, calibration and model uncertainty

Subject Areas : WATER RESOURCES

mahboobeh  Hajibigloo ¹ (دانشگاه گرگان)

Received: 2018-04-14 Accepted : 2021-06-06 Published : 2021-05-22

Keywords: Calibration, Sediment, algorithm sufi2, Analysis of uncertainty,

Abstract :

Calibration and analysis of model uncertainty were performed using SUFI-2 program. P-factor, R-factor, br2 and r2 indices were used to evaluate the ability of SWAT model to simulate runoff and sediment before Shirin Dareh dam construction and after Shirin Dareh dam construction. The aim of this study is to evaluate the efficiency of SWAT model in estimating average daily flow and sediment concentration and calibration and validation of this model in Atrak watershed located in North Khorasan Razavi province. The results showed that the monthly runoff before shirindare dam building coefficients in calibration P-factor, R-factor, br2 and r2 at the outlet to the 0.73, 1.15, 0.53 and 0.56 and in validation stage 0.77, 1.3, 0.48 and 0.58 respectively. The values for calibration of sediment concentration at the outlet, respectively, 1.58, 2.15, 0.98 0.25, and 0.47 respectively at the stage of validation is 2.5, 0.32 and 0.57. The output produced by the model, Shirin dareh sub-basin to be known as the most erosion. The high annual sediment into the reservoir of the dam and the shelf life is reduced. The results showed that SWAT simulated runoff much better than sediment. The reasons for model poor for simulation of sediment load can be Flow Low simulation, few data, use sediment information Discontinuity can be mentioned.