Real-time Prediction of Urban Inundation based on SWMM 1D-1D Model

Abstract

The concept of a Major/Minor system was applied to use urban flood prediction techniques, based on rainfall forecasts and real-time simulations, to reduce flood damage, by notifying a possible flood risk in advance. The SWMM one dimensional (1D)-two dimensional (2D) model has become the standard approach used in urban flood modeling, as it can realistically express the interaction between drainage networks and road surfaces. However, it is limited to the flood analysis of small areas due to its two-dimensional model characteristics, such as its long simulation time. Therefore, the SWMM 1D-1D model, which is fast enough to be applied to real-time simulations, is applied to real-time flood forecasting. To improve the accuracy of the model, SWMM 1D-1D model was calibrated using the SWMM 1D-2D model simulation results, and the SWMM 1D-1D model simulation results were extracted using the SWMM5 DLL and EXCEL VBA to analyze the flood situation. Finally, the applicability of the SWMM 1D-1D model was reviewed based on a rainfall event that occurred on 25 August 2014, assuming an hour of predicted rainfall. Key words : SWMM5 DLL, 1D-1D Model, 1D-2D Model, Flood Prediction 요 지 침수 위험성을 사전에 알림으로써 피해를 저감할 수 있는 침수예측기법 중 예측 강우 및 실시간 모의 기반의 침수예측기법을 활용하기 위해 Major/Minor 시스템 개념을 적용하였다. 도시침수 모델링의 표준사례가 된 SWMM 1D-2D모형은 배수관망과 도로 표면의 상호작용을 더 현실적으로 표현할 수 있지만 긴 모의시간 등 2차원 모형 특성 상 소규모 지역의 원인분석에