Model Study of the Influence of Wind and Tide on the Evolution of River Plumes
风、潮对河流羽流发展影响的模型研究

A 3-D baroclinic ocean model is used to examine the influence of tide,offshore wind and upwelling-favorable wind on the river plume development.Both tidal mixing and wind stirring can weaken the vertical stratification induced by freshwater buoyancy,but different mechanisms dominate such a process: tidal mixing is accomplished through the upward dissipation of turbulent kinetic energy whereas wind stirring is in the opposite direction.By simulating river plume evolution under the combined action of tide and estival wind field averaged over many years,we have found that the modeled salinity distribution is consistent with the observed one rather well,which means the river plume development plays an important role in adjusting the salinity distribution in the surface layer of Bohai Sea.