Study on Circular Jet Scouring Loose Sediment Deposited over the Outlet

Related to the studying on the sea outfall engineering of city sewage disposal, circular jet scouring the loose sediment deposited over the outlet is studied through hydraulic model tests. The processes of jet scouring deposited sediment can be divided into three stages according to the experiment, that are stages of initial fluidization, full fluidization and stable and clear scouring pit. Using dimension analysis and regression analysis to the experimental data, the empirical equations to predict the critical sediment scouring velocity and the dimensions of scouring pit of which horizontal circular jet scouring loose sediment deposited over the outlet in the stagnant water are put forward.