关键词: 溃坝； 洪水演进； 数值模拟； 溃坝模型, 白格堰塞湖

Abstract: In order to efficiently and accurately calculate the dam-break flood propagation process of barrier lakes, a two-dimensional hydrodynamic model based on GPU acceleration technology was used to simulate the dam-break flood propagation process of Baige barrier lake in Jinsha River formed on 10/10/2018 and 11/03/2018. The simulated results were compared with the measured hydrographs at gauge stations of Yebatan and Suwalong. The simulation results showed that for mountainous areas without high-accuracy topographic data, the two-dimensional hydrodynamic model can reliably simulate the process of dam-break flood propagation process. In terms of computation efficiency, when simulating the 40-hour flood routing process with the topographic data of 4.62 million grids, the two simulations take 61 minutes and 74 minutes, respectively. The model is very efficient in simulating flood propagation, and it can provide good data support for decision-makers in flood emergency rescue events.

Key words: Baige barrier lake, dam break, flood propagation, numerical simulation, dam break model