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.