Research on coping with extreme rainstorm flood and enhancing flood safety resilience——taking the Taihu basin as an example
Wu Juan
Qian Aoran
Lin Hejuan
Abstract：In order to cope with the flood risk similar to the"7·20"mega-rainstorm in Zhengzhou,and to ensure the flood control safety and enhance the flood protection resilience under the conditions of extreme rainfall over the Taihu basin,the Zhengzhou's"7·20"mega-rainstorm was transposed to the Taihu basin,the coupled atmospheric-hydrological modeling system was adopted to deduce the representative station water stage response to extreme rainstorm for the backbone flood control project system(such as the Taipu River,Wangyu River,Jiangnan Canal,hydraulic engineering along the Yangtze River and the Hangzhou Bay,etc.).Three flood scheduling conditions were formulated to assess the risk of extreme rainstorm and floods for the basin,region and city.The study showed that the rainstorm center was transplanted to Wuchengxiyu sub-region,and the cumulative rainfall in three days reached to 398.0mm.Under the current scheduling,the maximum water stage of the representative station of the northern sub-region was between 0.15m to 0.88m higher than the highest water stage in the history since the record was made.Under the full drainage scheduling for the outer circle,the maximum water stage of the representative station of the northern sub-region was between 0.07m to 0.76m higher than the highest water level in the history.Under the full drainage scheduling for the outer and inner circle,the maximum water stage of the representative station of the northern sub-region was between 0.03 m to 0.28 m higher than the highest water level in the history.The flood peak water stage in Wuxida station can be reduced to 5.78 m,which was lower than current top of the embankment elevation of the Wuxi section of the Jiangnan Canal.The results can improve the emergency response capability to cope with excessive rainstorm and flood,and provide key technical support and scientific decision-making basis for strengthening the risk perception,forecasting and early warning,risk judgment,scheduling decision-making,response linkage and other key links in the flood disaster of the Taihu Lake basin.
Keywords：Taihu basinextreme rainstormflood forecastcoupled atmospheric-hydrological modeling system
Publication Date：2024-04-27
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 25-32 )