Assessment and Optimization of Water Resources Regulation for River Networks in the Tidal Plain—A Case Study of the Qingsong Area in Shanghai

The plain river network area has a developed economy, large population, complex water system, and weak hydrodynamics. In order to improve the hydrodynamic conditions of area, clean sources are introduced through resources regulation supplement ecological quantity effectively environment river. this paper, Qingsong in Shanghai is used as research object. Prototype observation, numerical simulation, other methods build mathematical model evaluate effect put forward two optimization schemes. results indicate that overall flow from north south west east, with maximum 10–68 m3/s north–south backbone, exchange cycle between backbone river, peripheral bodies 4.3 days. largest amount diverted along Wusong River, accounting for 53% total diversion; drainage mainly relies on gates Huangpu River Diandong Pumping Gate, 43% 42%, respectively. view lowering level slice during low tide period, an optimal scheme been more diversion less which can raise by 0.05–0.10 m. Assessment scheduling provide reference enhancement tidal plain.