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Open AccessArticle

Case Study of HEC-RAS 1D–2D Coupling Simulation: 2002 Baeksan Flood Event in Korea

1
Department of Agricultural and Environmental Engineering, Chungnam National University, Daejeon 34134, Korea
2
Water Resources Research Center, K-Water Convergence Institute, Daejeon 34045, Korea
*
Author to whom correspondence should be addressed.
Water 2019, 11(10), 2048; https://doi.org/10.3390/w11102048
Received: 26 July 2019 / Revised: 11 September 2019 / Accepted: 27 September 2019 / Published: 30 September 2019
Recent studies strongly suggest the possibility of more frequent extreme events as a result of the changing climate. These weather extremes, such as excessive rainfall, result in debris flow, river overflow and urban flooding, which can pose a substantial threat to the community. An effective flood model is therefore a crucial tool in flood disaster control and mitigation. A number of flood models have been established in recent years. However, the major challenge in developing effective and accurate flood models is the disadvantage of running multiple models for separate, individual conditions. Among the solutions in recent research is the development of combined 1D–2D flood modeling. Coupled 1D–2D flood modeling allows the channel flows to be represented in 1D and the overbank flow to be modeled in 2D. In order to test the efficiency of the approach, this research aims to assess the capability of the U.S. Army Corps of Engineers Hydrologic Engineering Center River Analysis System (HEC-RAS) model’s implementation of the combined 1D–2D hydraulic computation in simulating river overflow inundation. For verification, the simulation is applied to the Baeksan river levee breach event in South Korea in 2011. The simulation results show similarities of the observed data and the outputs from widely used flood models. This proves the applicability of the HEC-RAS 1D–2D coupling method as a powerful tool in simulating accurate inundations for flood events. View Full-Text
Keywords: flood modeling; 1D–2D coupling method; river overflow; HEC-RAS; extreme weather events flood modeling; 1D–2D coupling method; river overflow; HEC-RAS; extreme weather events
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MDPI and ACS Style

Lea, D.; Yeonsu, K.; Hyunuk, A. Case Study of HEC-RAS 1D–2D Coupling Simulation: 2002 Baeksan Flood Event in Korea. Water 2019, 11, 2048.

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