实时动态耦合模型及其在洪水风险图中的应用

将水力学的一维模型和二维模型实时动态耦合,可以解决溃堤、漫堤等洪水演进问题. 但传统的一维和 二维洪水演进模型通常是独立的模块,且模拟计算所花时间较长,结果也不够准确. 把独立的一维和二维模型 通过时间同步和空间耦合节点的对应关系,建立了一、二维实时动态耦合模型. 利用干水深和湿水深理论,改进 了传统的洪水演进模型. 采用该模型模拟了谷堆圩蓄滞洪区的溃堤洪水演进情况,通过历史洪水对模型进行了 验证,基于模拟结果绘制了规范的洪水风险图. 结果表明:一、二维水动力实时动态耦合模型在模拟溃堤洪水 时,模拟计算结果较传统的方法更为合理,且花费时间更少.

A real-time dynamic coupling model for flood routing and its application to flood risk charting

Floods caused by dike break and overtop can be simulated with a dynamically coupling model of 1D and 2D hydraulic model. Generally, the traditional 1D and 2D flood routing models are operated separately. Moreover, the traditional model would take a great amount of time to simulate, and the given results are not accurate. In this paper, a 1D-2D dynamic coupling model for the flood routing is developed through time synchronization and corresponding of space nodes. According to dry depth and wet depth theory, the traditional flood routing model is optimized, which saves much time for simulation. An example of Guduiwei flood detention basin is shown for rerifying the 1D-2D dynamic coupling model. Historical floods are simulated with the 1D-2D dynamic coupling model, which has verified the correctness of the model. Based on the results, a flood risk chart is established with standards. The results show that the 1D-2D dynamic coupling model is reasonable in simulating dike break-induced floods with much time saved.