Study on Characteristics of Hydrodynamic and Pollutant Transport of the Tributary Estuary in the Three Gorges Reservoir Area
To further clarify the impact of construction of the Three Gorges Reservoir on its tributaries. In this study, a three-dimensional hydrodynamic model of Changshou-Fuling section of Yangtze River was developed based on EFDC. Then an analysis of the hydrodynamics and the long term mass transport behaviors under backwater effect in the Taohuaxi River and Longxi River was presented. The results show that mainstream backwater effect plays a significant role in tributary during low-water period. And distinct circulation was shown in tributary estuary. However, in high-water period, estuarine circulation area in Longxi River decreased and disappeared, while the one in Taohuaxi River is still evident. Different input action from mainstreams to tributaries has been discovered.