SWAT 모형을 이용한 제주도 하천의 유출량 모의

Abstract

The outflow within the basin was calculated as appling SWAT model of Semi-distributed rainfall-runoff model firstly at Jeju Island to the important rivers(Chenmi river, Oaedo river, Ongpo river and Yeonoae river). The data of watergate ? weather and GIS input data (DEM, Landuse map, Soiltype map) were constructed as the input data to be applied to the basins to be studied and the parameters related to the runoff among the hydrological parameters of model were selected to analyze the sensitiveness. The basin of Chunmi river of the eastern region of Jeju Island, as the result of correcting as utilizing direct runoff data of 2 surveys , appeared the similar value to the existing basin average runoff rate as 22% of average direct runoff rate for the applied period. The basin of Oaedo river of the northern region showed R2 of 0.93, RMSE of 14.92 and ME of 0.70 as the result of correcting as utilizing runoff data in the occurrence of 7 rainfalls. The basin of Ongpo river of the western region showed R2 of 0.86, RMSE of 0.62 and ME of 0.56 as the result of correcting as utilizing runoff data except for the period of flood in 2002?`2003. Yeonoae river of the southern region showed R2 of 0.85, RMSE of 0.99 and ME of 0.83 as the result of correcting as utilizing runoff data of 2003. As the result of calculating runoff for the long term about 4 basins of Jeju Island(Chunmi river, Oaedo river, Ongpo river and Yeonoae river) from the above results, SWAT model wholly appears the excellent results about the long-term daily runoff simulation. If SWAT model is constructed as ensuring further more runoff data and analyzing?verifying with the result of this study, it is judged to have very excellent utilization at the aspect of the long-term daily runoff simulation of Jeju Island and the integrating management of whole basins.