基于洪水演进数值模拟的溃坝危害性快速评估

Rapid Evaluation of Dam-break Hazard Based on Numerical Simulation of Flood-routing

采用部分溃坝模型与堰流相交算法计算溃坝最大流量,并基于四次抛物线概化方法得到溃坝洪水的流量过程线;利用洪峰展平法将洪水波概化为三角形,对洪水演进过程进行模拟,分析溃口宽度和溃口形态对洪水演进过程的影响;研究考虑不同溃坝条件下对溃坝洪水的到时、最大流量、水深和洪水历时等洪水演进的主要参数的快速估算方法,以实现对地震可能引发不同溃坝事件危害性的快速评估。

Maximum discharge of dam-break is calculated by algorithm of dam-break model intersected with weir flow.Discharge hydrograph of dam-break flood is got based on four parabola generalizations.The flood wave is generalized as a triangle with flood peak flattening method to simulate flood-routing process and analyze effects of dam breach width and form on the process.A rapid estimation method is studied for significant flood-routing indexes as arriving time,maximum discharge,depth,duration,etc of flood under the condition of different dam-break situations to realize rapid evaluation on hazards of different earthquake induced dam-breaks.