关键词: 咸潮入侵;压咸补淡;联合调度;水工程群;三峡水库;长江口;

Abstract: In 2022,the Changjiang River Basin experienced a rare dry and drought climate in flood season, and the runoff was significantly less than normal.The salt tide intrusion in the Changjiang River Estuary occurred early, lasted for a long time, and its intrusion degree was serious.The joint operation of water projects group is an important measure to recharge fresh water for repelling saltwater intrusion and ensure the safety of water supply.According to the characteristics of saltwater intrusion in the Changjiang River Estuary, based on the hydrological forecast and operation system of the Changjiang River Basin, a one-dimensional hydraulic model considering the comprehensive influence of long river system, long distance and multi-type water projects was built to simulate the multi-condition scenarios.Combined with the analysis of prototype data, an operation strategy to recharge fresh water for repelling saltwater intrusion adapted to the current water projects group in the Changjiang River Basin was proposed from the perspectives of operation opportunity and objectives.Through this operation, the water level along the middle and lower reaches significantly raised, the impact of salt tide in the Changjiang River Estuary had been reduced, the situation of water supply shortage had been basically alleviated, and remarkable social and ecological benefits had been achieved.The research result can provide a reference for recharging fresh water for repelling saltwater intrusion in Chiangjiang River Estuary in the future.

Key words: salt tide intrusion; recharge fresh water for repelling saltwater intrusion; joint operation; water projects group; Three Gorges Reservoir; Changjiang River Estuary;