Spatial diversion and coordination of flood water for an urban flood control project in Suzhou, China  

作　　者：Yu Xu You-peng Xu Qiang Wang Yue-feng Wang Chao Gao 

机构地区：[1]Department of Geography and Spatial Information Techniques,Ningbo University,Ningbo 315211,China [2]State Key Laboratoryof Hydology Water Resources and Hydraulic Enginering,Nanjing Hydraulic Research Institue,Nanjing 210029,China [3]Laboratory of Sustainable Urban Drainage,Ningbo University,Ningbo 31521l,China [4]Schol of Gegraphical and Oceanographic Sciences,Nanjing UniversiyNanjing 210023,China [5]School of Geography and Tourism,Chongqing Normal University,Chongqing 401331,China

出　　处：《Water Science and Engineering》2024年第2期108-117,共10页水科学与水工程（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grants No.42001025 and 42001014);the Belt and Road Special Foundation of the State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering(Grant No.2021491211);the Natural Science Foundation of Ningbo Municipality(Grant No.2023J133).

摘　　要：Suzhou City,located in the Yangtze River Delta in China,is prone to flooding due to a complex combination of natural factors,including its monsoon climate,low elevation,and tidally influenced position,as well as intensive human activities.The Large Encirclement Flood Control Project(LEFCP)was launched to cope with serious floods in the urban area.This project changed the spatiotemporal pattern of flood processes and caused spatial diversion of floods from the urban area to the outskirts of the city.Therefore,this study developed a distributed flood simulation model in order to understand this transition of flood processes.The results revealed that the LEFCP effectively protected the urban areas from floods,but the present scheduling schemes resulted in the spatial diversion of floods to the outskirts of the city.With rainstorm frequencies of 10.0%to 0.5%,the water level differences between two representative water level stations(Miduqiao(MDQ)and Fengqiao(FQ))located inside and outside the LEFCP area,ranged from 0.75 m to 0.24 m and from 1.80 m to 1.58 m,respectively.In addition,the flood safety margin at MDQ and the duration with the water level exceeding the warning water level at FQ ranged from 0.95 m to 0.43 m and from 4 h to 22 h,respectively.Rational scheduling schemes for the hydraulic facilities of the LEFCP in extreme precipitation cases were developed ac-cording to food simulations under seven scheduling scenarios.This helps to regulate the spatial flood diversion caused by the LEFCP during extreme precipitation.

关 键 词：Urban flooding Urban flood control project Rainstorm fregue ncy Flood simulation model Suzhou City 

分 类 号：TU992[建筑科学—市政工程]