| 摘要: |
| 大坝安全不仅影响工程效益，还影响人民的生命和财产安全，溃坝洪水模拟可以对水库大坝的失事影响做出评估，对制定应急预案和防洪减灾具有重要意义。以深圳市龙华新区民治水库及下游片区为研究对象，基于MIKE FLOOD将MIKE11模型和MIKE21模型进行动态耦合，对溃坝洪水在下游的演进过程进行仿真模拟。模型采用瞬间溃（瞬间部分溃和瞬间全溃）以及逐渐溃两种溃决方式，分别模拟4种工况下的溃口流量过程线以及下游洪水演进过程。结果表明：瞬间溃的洪峰流量较大，出现在溃坝开始时刻，而逐渐溃的洪峰流量相对较小，出现在渗透破坏变形发展至上部坝体坍塌时刻，之后均随库区水位逐渐降低，下泄流量变小，直至库区水体排空。溃坝洪水对上游地区横岭村附近破坏较大，淹没水深较深。民治河中游段居民和商业区附近洪水流速接近5 m/s，对建筑物有一定破坏力，左侧向南村地势较低，淹没情况最为严重，并且在洪水消退后仍有3 m左右积水。民治河下游地区在洪水消退后也有少量积水。 |
| 关键词: 溃坝洪水 MIKE FLOOD 数值模拟 淹没水深 淹没范围 |
| DOI： |
| 分类号:TV122+.4 |
| 基金项目:广东省科技计划项目（2016A020223003）； 广东省水利科技创新项目（2016-32） |
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| Simulation research of urban dam break flood based on MIKE FLOOD model |
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WANG Xin1, WANG Weiqi1, HUANG Guoru2,3
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1.School of Civil Engineering and Transportation, South China University of Technology， Guangzhou;2.School of Civil Engineering and Transportation, South China University of Technology，Guangzhou;3.State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou
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| Abstract: |
| The safety of dam not only affects the benefit of the project, but also relates closely to the safety of people’s life and property. Dam-break flood simulation can evaluate the impacts of dam-break, and it is of great significance to the making of emergency plans so as to control flood and reduce disasters. Researches are carried out on the dam-break flood developing process in the downstream of the Minzhi reservoir based on the MIKE FLOOD model, which couples MIKE 11 and MIKE 21. By adopting two methods, a sudden dam-break method (for sudden partial dam-break as well as sudden full dam-break) and a gradual dam-break method, simulations of the flow graphs at the breach dam under four operating situations and the flood developing process in the downstream are respectively made in this study. The research results show that the peak flow of the sudden dam-break is larger at the beginning of the dam break, and the gradual dam-break peak flow is relatively small when the deformation of seepage failure develops to the upper part of the dam. And then, as the water level in the reservoir falls gradually, the flow discharge becomes smaller, until the reservoir is emptied. The dam-break flood has a greater destructive power against the upstream area of the Hengling village, where the submerged depth is larger. The flood velocity is up to 5 m/s in the residential and commercial areas of the middle reach of the Minzhi River. The flood has a certain damage to the buildings. The left side of the Xiangnan village is low-lying, the flooding is the most serious, and it still has a waterlogging depth of 3 m after the flood subsidence. |
| Key words: dam-break flood MIKE FLOOD numerical simulation inundated depth inundated area |
