挡水建筑物对河道洪水演进和淹没的影响分析

Analysis of the influence of water-retaining buildings on river channel flood evolution and submergence

以沂河流域红水河为研究对象,基于MIKE21建立水动力模拟模型,采用糙率分区、网格加密、非结构化三角形网格剖分等技术进行优化,模拟河道洪水演进过程、淹没历时、保护区(监测点)的淹没情况等,对水工建筑物对河道上下游的洪水风险性的影响进行了分析。结果表明:河道中挡水建筑物会使其上游水位雍高,延长洪水演进过程,增大淹没历时,淹没水深增大,而对其下游洪水演进影响较小。同时,计算方法可以为工程实践中相关问题提供建设参考和判断依据。

Taking the Hongshui River in the Yihe River Basin as the research object,a hydrodynamic simulation model is established based on MIKE21,which is optimized by using roughness zoning,grid encryption,unstructured triangular meshing and other technologies to simulate the river flood evolution process,inundation duration the inundation of protected areas(monitoring points),etc.,analyzed the impact of hydraulic structures on the flood risk of the upper and lower reaches of the river.The results show that the water-blocking structure in the river channel will make the upstream water level high,prolong the flood evolution process,increase the duration of submergence,increase the depth of submerged water,and have little effect on the downstream flood evolution.At the same time,the calculation method can provide construction reference and judgment basis for related problems in engineering practice.