Comparative analysis and risk assessment of dam-break floods: Taking Pingshuijiang Reservoir as an example
| Autor: | Xun Jiang, Jie Meng, Bingjie Fan, Chongxu Zhao, Yanshuang Zheng, Qianlu Xiao, Chunjin Zhang, Dongfang Ma |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Hydrology Research. 54:265-275 |
| ISSN: | 2224-7955 0029-1277 |
| DOI: | 10.2166/nh.2023.129 |
| Popis: | Due to the huge potential energy associated with water storage in reservoirs, dam-break floods are often catastrophically destructive for people and structures downstream. This study aims to simulate and compare floods generated under various dam-break scenarios and their downstream impacts, taking Pingshuijiang Reservoir in southeastern China as an example. A two-dimensional hydrodynamic model is used to simulate the downstream evolution of floods under three dam-break scenarios, and the breach flood and downstream inundation process are analyzed. Gradual failure of the main dam leads to near-total inundation of the nearby town over c. 1 h, allowing time for warning and evacuation. Instantaneous failure of the main dam results in larger peak flow, greater submergence depth and faster inundation (20 min), leaving little time for warning/evacuation. Instantaneous failure of the auxiliary dam generates a much lower peak flow magnitude and, although the town is still largely submerged within 45 min, the shallow water depth and low velocity are conducive to rescue/evacuation. The results show significant variation in flood process and submergence due to dam size and failure mode that provide guidance for dam-break flood risk assessment and disaster avoidance planning. |
| Databáze: | OpenAIRE |
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