Benefit evaluation of emergency dispatching for over-standard flood in Taihu Lake Basin
There are many water conservancy projects in Taihu Lake Basin and these projects' operation is complex.It is of great significance to study how to scientifically evaluate the benefits of flood control and disaster mitigation of water conservancy projects and to formulate engineering plans for river basins.In this study,we integrated a flood inundation simulation model and a flood loss assessment model of Taihu Lake Basin,which can simulate the water level,water quantity,and flood inundation of the river network in the basin under different scenarios.The models can also be used to evaluate the flood loss after the dispatch of different water projects according to the distribution of flood inundation characteristics.Based on the over-standard flood in Taihu Lake Basin in 2020,we simulated the flood disaster situation under the two scenarios of conventional dispatch plan and emergency dispatch plan,and evaluated the disaster mitigation benefits of using the over-standard flood emergency dispatch scheme in flood defense in 2020.The results showed that the use of the over-standard flood emergency dispatch scheme played an important role in defending Taihu Lake over-standard flood in 2020.In particular,increasing the drainage capacity of the two main flood dis-charge channels of Taipu River and Wangyu River can reduce the water level of Taihu Lake by 0.31 m,shorten the duration of high water level in Taihu Lake and adjacent area by1～22 days,reduce the inundation area by180.1 km2,and reduce the direct economic loss of the basin by about 1.62 billion Yuan.The research results can provide a reference for the formulation of flood dispatch schemes and plans in Taihu Lake Basin.
over-standard floodflood control dispatchdisaster mitigation benefithydrological and hydrodynamics modelTaihu Lake Basin
国家科技期刊平台
NSTL
万方数据
维普
