GIS 기반 SWAT 모델을 이용한 동향,천천유역의 부유사량 분석 = The Analysis of Suspended Sediment Load of Donghyang and Cheoncheon Basin using GIS-based SWAT Model

다국어 초록 (Multilingual Abstract)

This study applied SWAT model to analyze suspended sediment load that is influence on the high density turbid water in Donghyang and Cheoncheon basin, which are located in the upstream of Yongdam Dam. GIS data such as DEM, land cover map and soil map, and meteorological data were used as the input data of SWAT model. And the rating curve equation and Q-SS equation of Donghyang and Cheoncheon gauge station were applied as the measured values of them. As the result of flowout, the coefficient of determination (R2) and the Nash-Sutcliffe coefficient of efficiency (EI) of model calibration showed high as 0.87 and 0.87 at Donghyang gauge station, and the R2 and EI of model validation were high as 0.95 at Cheoncheon gauge station. Also, as the result of suspended sediment load, the R2 and EI of model calibration were high as 0.77 and 0.76 at Donghyang gauge station, and the R2 and EI of model validation marked high as 0.867 and 0.80 at Cheoncheon gauge station. It is considered that the suspended sediment load of 2003 showed the highest due to rainfall amounts and rainfall intensity in using SWAT model. The results of suspended sediment modeled in this study can be applied to the decision-making support data for the evaluation of soil erosion possibility and turbid water potential in the management of reservoir.

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