潮汐通道外泄水流喷射扩散对拦门沙形成的作用

The Effect of Outflow Jet on the Formation of Entrance Bar in Tidal Inlet

The tidal inlet of the Shuidong lagoon is deep and navigable,however,there is a entrance bar which hinders shipping because of the shallow water depth.On the basis of jet,this paper deals with the diffusion of outflow and jet velocity variation with the distance seaward and suggests the jet diffusion model in the Shuidong lagoon.It is expounded that sediment component and structure of the entrance bar as well as its evolution responded well to jet dynamic system.Chan- ges of the jet diffusion and the entrance bar situation and possibility in project are estimated when the entrance bar is to be harnessed with project in the near future.