The main objective of this study is to simulate the rainfall- runoff relationship of the Ohwon basin. For the this study, we used GIS (Geographical Information System) technique and HEC-HMS. A GIS technique is capable of extracting various hydrological factors from D.E M(Digital Elevation Model). In...
The main objective of this study is to simulate the rainfall- runoff relationship of the Ohwon basin. For the this study, we used GIS (Geographical Information System) technique and HEC-HMS. A GIS technique is capable of extracting various hydrological factors from D.E M(Digital Elevation Model). In this study, watershed itself and geometric factors of watershed were extracted from D.E M by using a GIS technique. The scanned data of topographical map with scale of 1.50,000 in the Ohwon river basin was used for this study and it was converted to D.E.M data. Based on the spatial analysis using those GIS technique, It would be possible to obtain the reasonable results of watershed characteristics. The parameters of HEC-HMS such as watershed area(A), River length, and SCS Curve Number(CN) etc. were extracted by using the GIS technique in the Ohwon Basin. The results of extracted parameters, in case of basin area, were 62.25㎢ for subdivided A basin, 109.27㎢ for basin B, and 121.32㎢ for C basin And in case of the longest channel length, A basin was 15.10km, 8 basin was 20.68km, and C basin was 22.47km. And in case of the basin slope, A basin was 1.30%, B basin was 2.28%, and C basin was 2.85%, and in case of the runoff curve number(CN), A basin was 67.46, B basin was 67.38, and C basin was 59.17, and in case of the lag time, A basin was 542.19min, B basin was 527.35min, and C basin was 622.95min. The parameters extracted from each watershed were applied to the HEC-HMS, and then were optimized by the observed recorded data and rainfall data. In this study, to optimize the parameters the Nelder-Mead Method(N&M)were used. For the 1998 year storm events, the results of optimized parameters, the range of CN values was 72.24∼85,26, lag time was 320∼8.94hr, C_(p) was 0.81∼0.99, and initial base flow was 0.11∼ 2.57cms. Then, the optimized parameters and HEC-HMS were applied to the study area for the simulation of rainfall-runoff relationship. The rainfall data used in this study was that of 1997∼1999 year, The rainfall events were selected as followings: one in 1997, six in 1998 ,and four in 1999. As a result of this study, G[S technique is useful to the extraction of watershed characteristics factors and HEC-HMS is successful in the simulation of rainfall-runoff relationship. For the results of simulation of rainfall-runoff relationship, the time of peak discharge is nearly concurrence, and the difference of peak discharge is -46.47∼17.83cms.
The main objective of this study is to simulate the rainfall- runoff relationship of the Ohwon basin. For the this study, we used GIS (Geographical Information System) technique and HEC-HMS. A GIS technique is capable of extracting various hydrological factors from D.E M(Digital Elevation Model). In this study, watershed itself and geometric factors of watershed were extracted from D.E M by using a GIS technique. The scanned data of topographical map with scale of 1.50,000 in the Ohwon river basin was used for this study and it was converted to D.E.M data. Based on the spatial analysis using those GIS technique, It would be possible to obtain the reasonable results of watershed characteristics. The parameters of HEC-HMS such as watershed area(A), River length, and SCS Curve Number(CN) etc. were extracted by using the GIS technique in the Ohwon Basin. The results of extracted parameters, in case of basin area, were 62.25㎢ for subdivided A basin, 109.27㎢ for basin B, and 121.32㎢ for C basin And in case of the longest channel length, A basin was 15.10km, 8 basin was 20.68km, and C basin was 22.47km. And in case of the basin slope, A basin was 1.30%, B basin was 2.28%, and C basin was 2.85%, and in case of the runoff curve number(CN), A basin was 67.46, B basin was 67.38, and C basin was 59.17, and in case of the lag time, A basin was 542.19min, B basin was 527.35min, and C basin was 622.95min. The parameters extracted from each watershed were applied to the HEC-HMS, and then were optimized by the observed recorded data and rainfall data. In this study, to optimize the parameters the Nelder-Mead Method(N&M)were used. For the 1998 year storm events, the results of optimized parameters, the range of CN values was 72.24∼85,26, lag time was 320∼8.94hr, C_(p) was 0.81∼0.99, and initial base flow was 0.11∼ 2.57cms. Then, the optimized parameters and HEC-HMS were applied to the study area for the simulation of rainfall-runoff relationship. The rainfall data used in this study was that of 1997∼1999 year, The rainfall events were selected as followings: one in 1997, six in 1998 ,and four in 1999. As a result of this study, G[S technique is useful to the extraction of watershed characteristics factors and HEC-HMS is successful in the simulation of rainfall-runoff relationship. For the results of simulation of rainfall-runoff relationship, the time of peak discharge is nearly concurrence, and the difference of peak discharge is -46.47∼17.83cms.
주제어
#산정 유출량 지형정보자료 HEC-HMS
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