将澧南垸分洪闸流量过程作为边界条件,运用矩形结构化网格剖分计算域,利用MIKE21水动力学模块对其分洪洪水演进过程进行了数值模拟。通过选取的特征线及特征点,定量分析了澧南垸分洪洪水特征。模拟水位与实际水位的拟合结果基本吻合,表明MIKE21水动力学模型能较好地模拟澧南垸的分洪过程。 Taking the flow process of flood diversion floodgate in the South Lake as the boundary condition, the rectangular structured grid was used to divide the computational domain. The MIKE21 hydrodynamic module was used to simulate the flood diversion flood process. By selecting the characteristic lines and characteristic points, the characteristics of flood diversion flood in Taonan are quantitatively analyzed. The fitting results of simulated water level and actual water level basically coincide, indicating that the MIKE21 hydrodynamic model can better simulate the flood diversion process in the southern embankment.