A Computational Model for Estuarine Velocity Separation in Yangtze River

In Yangtze River, the actual flow mainly is induced by tidal, wind, salinity and the river water runoff. The interactions of these main components are very complicated. From the actual hydrodynamic characteristics of estuarine waters, a simple model to separate the measured velocity is advanced by application of the theoretical current velocity profiles and the least square method combination of enumeration. It can respectively get not only the vertical structures of tidal, wind-driven current, density current and runoff as well as their proportions in the velocity measured, but also reasonable boundary conditions on the surface and bottom, which are used in two and three dimensional hydrodynamics numerical simulation in estuarine waters, can be obtained. Then, this model is applied to the velocity data observed in Yangtze River estuary. The results are satisfactory. So it is a valid method to analyze and calculate the field data.