Research on Water-sediment Numerical Simulation of Middle and Lower Reaches of the Yangtze River and Estuary

Base on 1D-2D water-sediment transportation numerical algorithm, the middle and lower reaches of Yangtze River simulation model is established form Yichang city of the Middle Yangtze To Liuxiao Town site on Yangtze river estuary. The numerical model simulate the river-lake water and sediment exchange, between the Yangtze River and Dongting lake or Poyang lake. After the completion of Three Gorges Reservoir, The Yangtze river runoff distribution was changed during the year. Through the model, we analyze the impact of the change of the Yangtze river water sand on the effect of runoff and tides.