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 inten...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.展开更多
After having completed river regulation work in recent years, the dike distance up the reach of Lutaizi has been extended to 1.5 2.0 km in the Huaihe river. When the middle flood happened,such as those in 1956, 1982 ...After having completed river regulation work in recent years, the dike distance up the reach of Lutaizi has been extended to 1.5 2.0 km in the Huaihe river. When the middle flood happened,such as those in 1956, 1982 and 1991, flood can pass through safely. If the flood of 1% frequency happens, the flood discharge at Lutaizi will be larger than safe flood discharge 10000 m 3/s in downstream Lutaizi. By storing flood with the Linhuaigang sluice, the discharge of Lutaizi will not be over 10000 m 3/s. Cities in downstream Lutaizi will be free from flood.展开更多
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).
文摘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.
文摘After having completed river regulation work in recent years, the dike distance up the reach of Lutaizi has been extended to 1.5 2.0 km in the Huaihe river. When the middle flood happened,such as those in 1956, 1982 and 1991, flood can pass through safely. If the flood of 1% frequency happens, the flood discharge at Lutaizi will be larger than safe flood discharge 10000 m 3/s in downstream Lutaizi. By storing flood with the Linhuaigang sluice, the discharge of Lutaizi will not be over 10000 m 3/s. Cities in downstream Lutaizi will be free from flood.
