摘要
Abstract
To cope with the severe flood challenges caused by extreme meteorological events in the western part of Shanghai,an effective water level control strategy was proposed.The Qingsong region of Shanghai during the"Fire-works"typhoon was selected as the research object.The actual rainfall and working condition data were comprehen-sively analyzed,including rainfall,water level of the river outside the polder,water level of the secondary polder,and water level process of the river outside the polder.Two strategies were proposed,namely,over-storage of rivers and lakes in the secondary polder area and controlling of drainage after the rain peak in the polder area.The effec-tiveness of alleviating the high water level was evaluated by using digital topographic analysis and numerical simula-tion of flood control.It is found that the implementation of the above strategies can greatly enhance the storage ca-pacity,and the theoretical estimate is to increase the capacity by about 11.7 million m3 and 2.46 million m3,re-spectively,which can reduce the water level of the river channel in the area by about 30 cm,and effectively allevi-ate the high water level.This study not only verifies the effectiveness of the strategy,but also adds new controlling methods to the existing flood control and drainage system,which provides a scientific basis for the city's scheduling decision-making when facing major water challenges,and has important practical value and theoretical contribution to building a more resilient water management system and ensuring the safe operation of the city.关键词
洪涝灾害/台风/高水位成因/上海西部Key words
flood disaster/typhoon/causes of high water/western Shanghai分类
建筑与水利
