Abstract:In order to further stabilize the river regime of the Yangtze River Estuary, protect the ecological base, maintain the deep-water channel, and make the reasonable use of dredging soil resources in the channel, from the perspective of benefiting the river regime and navigation, the planned mineable area around the Shanghai section of the Yangtze River Estuary and the Hengsha Shallow Beach Sand Source Area were selected as the sand source area for sand excavation in 2023 in the pilot section of Hengsha Shallow Beach Sand Fixation and Stability River Regime Project. The SWEM3D model is used to analyze the changes in flow velocity, flow field, tidal level, tidal flow and diversion ratio near the engineering area before and after sand mining. The comprehensive impact of sand mining on the river channel is analyzed from the aspects of river regime, flood control and navigation. The feasibility of sand mining is demonstrated. It is concluded that sand mining in this project will not have an impact on the channel of Yangtze River Estuary.
