| Title |
Accuracy Improvement of Urban Runoff Model Linked with Optimal Simulation |
| Authors |
하창용(Ha, Chang-Young) ; 김병현(Kim, Byunghyun) ; 손아롱(Son, Ah-Long) ; 한건연(Han, Kun-Yeun) |
| DOI |
https://doi.org/10.12652/Ksce.2018.38.2.0215 |
| Keywords |
도시유출;민감도 분석;매개변수 최적화 Urban runoff;SWMM;PEST;Sensitivity analysis;Parameter optimization |
| Abstract |
The purpose of this study is to improve the accuracy of the urban runoff and drainage network analysis by using the observed water level in the drainage network. To do this, sensitivity analysis for major parameters of SWMM (Storm Water Management Model) was performed and parameters were calibrated. The sensitivity of the parameters was the order of the roughness of the conduit, the roughness of the impervious area, the width of the watershed, and the roughness of the pervious area. Six types of scenarios were set up according to the number and types of parameter considering four parameters with high sensitivity. These scenarios were applied to the Seocho-3/4/5, Yeoksam, and Nonhyun drainage basins, where the serious flood damage occurred due to the heavy rain on 21 July, 2013. Parameter optimization analysis based on PEST (Parameter ESTimation) model for each scenario was performed by comparing observed water level in the conduits. By analyzing the accuracy of each scenario, more improved simulation results could be obtained, that is, the maximum RMSE (Root Mean Square Error) could be reduced by 2.41cm and the maximum peak error by 13.7%. The results of this study will be helpful to analyze volume of the manhole surcharge and forecast the inundation area more accurately. |