基于二维数值模拟的河道洪水影响研究

Research on Impact of River Flood based on Two-dimensional Numerical Simulation

为揭示大凌河河道洪水受河滩湿地的影响作用,基于率定的一维模型构造平面二维数学模型,定量模拟河道水位、流场形态受有无过水涵洞和有无湿地工况的影响。研究表明:湿地具有明显的消峰缓流、防洪泄洪功能,涵洞降低流速差、水位差及减少环流作用显著。研究成果可为流域防洪规划和洪水治理提供决策依据。

In order to reveal the roles of the Daling river flood affected by the flood wetland,a planar two-dimensional mathematical model is constructed based on a one-dimensional model with rate-setting,and the shape of water level flow field is influenced by the conditions of whether there are overwater culverts and whether there are wetlands.The study shows that:the wetland has obvious function of peak elimination and slow flow flood control and discharge,and culverts have obvious effect of reducing velocity difference,water level difference and circulation,and the research results can provide decision basis for flood control planning and flood control in river basin.