Study on SCS CN Estimation and Flood Flow Characteristics According to the Classification Criteria of Hydrologic Soil Groups

수문학적 토양군의 분류기준에 따른 SCS CN 및 유출변화특성에 관한 연구

  • Ahn, Seung-Seop (Department of Construction and Geoinformatics Engineering, Kyungil University) ;
  • Park, Ro-Sam (Department of Civil Engineering, Kyungil University) ;
  • Ko, Soo-Hyun (Department of Civil Engineering, Sangju National University) ;
  • Song, In-Ryeol (Graduate School, Kyungil University)
  • Published : 2006.08.01


In this study, CN value was estimated by using detailed soil map and land cover characteristic against upper basin of Kumho watermark located on the upper basin of Kumho river and the hydrologic morphological characteristic factors were extracted from the basin by using the DEM document. Also the runoff analysis was conducted by the WMS model in order to study how the assumed CN value affects the runoff characteristic. First of all, as a result of studying the soil type in this study area, mostly D type soil was Identified by the application of the 1987 classification criteria. However, by that in 1995, B type soil and C type soil were distributed more widely in that area. When CN value was classified by the 1995 classification criteria, it was estimated lower than in 1987, as a result of comparing the estimated CNs by those standars. Also it was assumed that CN value was underestimated when the plan for Geum-ho river maintenance was drawn up. As a result of the analysis of runoff characteristic, the pattern of generation of the classification criteria of soil groups appeared to be similar, but in the case of the application of the classification criteria in 1995, the peak rate of runoff was found to be smaller on the whole than in the case of the application of the classification criteria in 1987. Also when the statistical data such as the prediction errors, the mean squared errors, the coefficient of determination and other data emerging from the analysis, was looked over in total, it seemed appropriate to apply the 1995 classification criteria when hydrological soil classification group was applied. As the result of this study, however, the difference of the result of the statistical dat was somewhat small. In future study, it is necessary to follow up evidence about soil application On many more watersheds and in heavy rain.


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