Transport Mechanism of Water and Sediment in Yangtze River Estuary North-South Branch Bifurcation

This Base on the the field data of water and sediment of Yangtze River estuary bifurcation in 2004 fiood season and 2005 dry season, the features and process of water and sediment transport Was analyzed by decomposition mechanism.The law of velocity of residual currentsediment transport rate per unit width and tidal punping effect,which in different season and tide,are focused on.The relationship between the features of water and sediment and channel wvolution was discussed through the results of the discharge of water and sediment,which is a basis in the future study of discharge of water and sediment in estuary.