Assessment the potential of sediment and runoff production using rainfall simulator and hydrological models in the Kouzeh Topraghi watershed of Ardabil

Esmali Ouri, Abazar Assessment the potential of sediment and runoff production using rainfall simulator and hydrological models in the Kouzeh Topraghi watershed of Ardabil. University of Mohaghegh Ardabili.

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Abstract

Abstract: Watersheds are a range area with different conditions that simulation and assessment runoff and sediment yield of this region is very important for management and protect resources. The Kouzeh Topraghi watershed with 766 km2 area is located in south and upstream of Gareh Sou basin in Ardabil province. In this research for studying and assessment runoff and sediment yield of watersheds were used of modeling and rainfall simulator methods. Between the hydrological models, regarding to performance of SWAT model and WMS models, these models were used for simulation hydrological processes in region. Also for precise assessment was used of rainfall simulator, in field studies, on 58 hydrological response units (HRUs). The results of the models for simulation runoff and sediment were assessment by the statistical coefficients R2, NSE, and RMSE. In SWAT model for simulation runoff in calibration and validation periods these coefficients obtained 0.8-0.74, 0.71-0.69, and 0.32-0.33, and for sediment simulation obtained 0.75-0.66, 0.72-0.64, and 35.27-26.39, respectively. Also these coefficients were applied for assessment WMS model performance. For simulation runoff in calibration and validation periods these coefficients obtained 0.71-0.69, 0.68-0.67, and 0.75-2.07, respectively. Analyzing the results of field studies via rainfall simulator showed that Loamy soil, located in eight HRU has high effect on sediment yield in the region. Maximum amount of sediment from surface of these units is 6 ton/s. Comparing the results of studied methods showed that SWAT model has better performance for simulation runoff than WMS model and rainfall simulator. Also, values of simulated sediment using of this model are less than calculated sediments via rainfall simulator and are close to observational values.

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