Scheduling Scheme And Hydrodynamic Improvement Effect Analysis Of Miaojing River Water Diversion Project In Kunshan City

Kunshan City is located in the Taihu Lake Plain of the Yangtze River Delta.The terrain height difference in the territory is small,the rivers are rich in water resources,and the water flow area is gentle.Kunshan government vigorously promotes the development of urbanization and industrialization,and the water environment problems caused by rapid development have become increasingly serious.Some rivers have many problems such as serious deterioration of water quality,black and odorous water bodies,etc.Those problems seriously affect the sustainable development of society.In order to improve the efficiency of water diversion and exchange in each water network,the three areas of Kunshan City,namely Yushanwei Miaojingwei and Jiangpuwei,were taken as the simulation objects,and based on the one-dimensional river network hydrodynamic model,the water level of each area was studied under the condition of constant water level.During the water exchange process,the water exchange route of the Miaojing River water diversion project was designed according to the requirements that the water exchange of the black and smelly rivers in the three areas should be completed within two days,and the water flow velocity should reach the sensory flow velocity of 2cm/s during the water exchange period.The water exchange effect under the operation scheduling scheme is compared and analyzed,and the optimal sluice station scheduling operation scheme is comprehensively selected.This research mainly uses the water diversion master pumping station to store water in the eastern section of the Miaojing River first,to increase the water level difference between the upstream and downstream of each gate diversion gate,to divert water through self-flow by opening the gate,and to use a drainage pump at the downstream estuary to drain water to the outside of the water network,and The flow of each gate diversion gate is basically equal to the flow of the downstream estuary drainage pump to maintain a fixed water level in the polder.The total water diversion flow is 3.5m3/s.The water will be changed continuously within two days in Yushanwei in the old city.The water diversion flow is 1.3m3/s,and the remaining 2.2m3/s will be replaced by Miaojingwei and Jiangpuwei for one day.By simulating the hydrodynamics of the specific water diversion scheduling scheme of the Miaojing River and each polder,the results show that:according to the scheme designed in this study,under the condition of diverting 300,000 m3 of water per day,it is basically possible to realize the water diversion of Yushanwei and Temple within two days.The water exchange of the black and smelly rivers in Miaojingwei and Jiangpuwei.Except for Dongcangji river and Xicangji river in Yushanwei,the average flow velocity of other rivers during water exchange can reach the flow velocity of 2cm/s.In the process of water diversion in Jiangpuwei and Miaojingwei,the flow velocity of most of the rivers involved in water exchange can be greater than 2cm/s.