淮河中游董峰湖行洪区运用效果分析

以淮河中游董峰湖行洪区为例，采用水动力数学模型，通过对2003年型洪水的演算，根据水动力特性和蓄行洪功能的转变，将行洪区从开启到关闭的运用全过程划分为5个典型阶段，详细分析了各阶段行洪区内水动力特性和洪水传播规律，分析了行洪区运用前后上下游河段洪峰水位和流量过程的变化。研究结果表明：在行洪区运用的初始阶段，行洪区蓄洪功能强，削峰作用明显，能有效降低上下游洪峰水位；而进入行洪阶段后，行洪区主要起辅助河道行洪作用，只对上游洪峰水位有明显影响。

Effect analysis of Dongfeng lake flood zone application in the middle reach of Huaihe river

Taking Dongfeng lake as an example, the application process of the flood zone during the flood period in 2003 was calculated by using hydrodynamic numerical model. In this study, the application process of the flood zone was divided into five stages in detail according to the hydrodynamic characteristics and functions. Meanwhile, the hydrodynamic characteristics, the flood propagation law of the flood zone ,and the different effects on flood water level and discharge of up and down streams have been studied. According to the results, the flood water level of up and down streams can be reduced effectively at the beginning. And then, the flood zone can only make influence on the flood water level of upstream after the flood get through the flood zone.