Abstract
In order to study the influence of the navigation improvement project in the Qingyi River, on flood control of the complex river network, the water level variation of the key control stations in Shuiyang, Qingyi and Zhanghe river basins, flood diversion variation of middle reach of Shuiyang stem and flow pattern in the flow field before and after construction of the project using Mike11 model, under the conditions of designed flood and excessive standard flood. The results show that after construction of the project,the water levels at the control stations are decreasing or constant and the flood diversion of middle reach of Shuiyang stem decreases. So the project is beneficial to the flood control of the basins.
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