二维产汇流及溃坝淹没分析模型在堰塞湖的应用研究

Application of Two-dimensional Runoff Generation and Concentration Model and Dam-break Inundation Analysis Model in Barrier Lake

为准确计算堰塞湖溃坝的洪水演进过程,本研究构建了一个包含上游库区二维产汇流过程和下游淹没区二维洪水演进的高性能全过程耦合模型,并以四川省雷波县马湖水库为算例,对其百年一遇降雨过程及溃坝过程进行了动态模拟。结果表明,降雨至洪水汇集过程时间较短,汇水断面最大流量达到14000 m^(3)/s,易造成突发性山洪;突溃情景下,溃坝洪水在20 min内淹没坝后下游的黄琅镇区域,淹没水深达到10 m。本研究开发的二维产汇流及溃坝淹没模型在模拟洪水演进过程中准确高效,可实现洪水应急抢险事件的快速预测。

In order to efficiently and accurately calculate the dam break flood routing process of the dammed lake,a high-performance full process coupling model including the two-dimensional runoff generation and concentration process of the upstream reservoir area and the two-dimensional flood routing of the downstream inundated area was constructed.Taking Mahu Reservoir in Leibo County,Sichuan Province as an example,the 100 a rainfall process and dam break process were dynamically simulated.The simulation results show that the time from rainfall to flood convergence is short,and the maximum flow of catchment section reaches 14000 m^(3)/s.It is easy to cause sudden mountain torrents;In case of sudden break,the dam break flood will inundate the Huanglang Town area downstream of the reservoir dam within 20 minutes,and the inundation depth will reach more than 10 m.It can be seen that the two-dimensional runoff generation and concentration and dam break inundation analysis model is very efficient in simulating flood evolution,which can quickly predict flood emergency rescue events and provide powerful data support for decision makers.