Discussion on Factors Effecting Tidal Wave Propagation in Yangtze Estnary

Based on the assumptions for calculation of tidal waves in an estuary,the simplified topographic outline is derived for the water area south of the Chongming Island in the Yangtze Estuary,and totally 3 models respectively corresponding to 3 kinds of simplified topographic outline representing the water area are set up to discuss the factors which exert effects on the tidal wave propagation there.It is learnt from the computing results that the tidal wave propagation is effected jointly by the topography,the plane geometric shape of the estuary,and the river bottom friction.The narrowing of the river width plays the most important role,the next comes the river bottom friction,and the third is the variability of the river cross section.