Analysis on the influence of reservoir group on the runoff of Datong station in dry season

Datong Station is an important controlling station in the lower reaches of the Yangtze River. Analysis on the influence of upstream reservoir group on the runoff change characteristics can provide theoretical support for the utilization and sustainable development of water resources in the lower reaches of the Yangtze River and the Yangtze River Estuary. Based on in-situ observation and mathematical statistics, this paper analyzes the runoff composition of Datong Station and the influence of reservoir group on the runoff of Datong Station in dry season. The main conclusions are as follows: the water inflow from Yichang and above is the main component of Datong Station runoff. The operation of upstream reservoir group adjusts the water inflow distribution of Datong Station to a certain extent. The water replenishing of reservoir group increases the runoff of Datong station obviously from November to March of the following year (dry season), which has a positive effect on resisting the saline water intrusion in the Yangtze River estuary.