基于一二维耦合技术的溃坝洪水模拟研究

Research on Dam-break Flood Risk Analysis Based on 1-D and 2-D Hydraulic Coupling Calculation Model

以印度尼西亚巴丹托鲁水电站溃坝洪水模拟为例,对于地形条件复杂的河流,利用MIKE软件基于一二维耦合技术构建溃坝洪水计算模型,对拟定的溃坝工况进行数值模拟。建立的溃坝洪水一二维耦合模型适用于不规则计算域和地形,通过引入了新的动态耦合技术,避免了采用单一模型时遇到的计算效率、网格精度和准确性方面的问题。通过数值模拟得到了溃口流量过程和下游海滩地区洪水演进过程,并对下游敏感区域进行淹没影响分析。模拟成果为水电站工程设计、溃坝洪水风险分析和灾害损失评估提供了技术支撑。

Taking the dam-break flood simulation of Batantoru Hydropower Station in Indonesia as an example,the dam-break flood calculation model is constructed by using MIKE software based on one-dimensional and two-dimensional coupling technology for the dam project in the river with complex terrain conditions,and then the dam-break floods under different proposed dam-break conditions are numerically simulated.The constructed coupling model is suitable for irregular computing domains and terrain,and by introducing new dynamic coupling technology,it can avoid the problems of single model in term of computation efficiency,grid precision and accuracy.The flow process of breach and the flood evolution process of downstream beach area are obtained through numerical simulation,and the inundation impact on downstream sensitive area is also analyzed.The simulation results provide technical supports for engineering design,dam-break flood risk analysis and disaster loss assessment of hydropower station.