Study On The Drainage Capacity And Deposit Reducing Method Of The NO.2 Sea Channel Of Tieshangang

Because of the flat coast of the northern Gulf, the outlet elevation of the sea channel is lower than the years mean high tide level.Therefore,the sea channel exists problems of insufficient drainage capacity and outlet siltation.Currently,there is no effective solution for these two issues,so it is of great significance to expand research on them.This paper takes the No.2 sea channel of Tieshangang for study.Firstly,it uses MIKE11 to establish the channel one-dimensional hydrodynamic model and analyzes the influence law of the gradient and outlet elevation to the channel drainage capacity respectively and proposes the channel drainage capacity optimization scheme based on the law.Secondly,it uses MIKE21 to establish tide,waves,sediment two-dimension models of the sea area near the channel and uses MIKE FLOOD to couple up the built MIKE11 and MIKE21 models to simulate the sedimentation situation of the outlet under nature condition.Finally,it establishes the model of wave absorbability and erode and proposes improvement measure for ti,then analyzes their erode effect respectively.The main conclusions are as follows:(1)The larger the gradient,the greater enhance of the drainage capacity by reducing gradient.vice versa;the higher the outlet elevation,the greater enhance of the drainage capacity by reducing outlet elevation, vice versa.(2)Keeping the design gradient of the No.2 sea channel unchanged and adjust the outlet elevation to -1.8m,thus the drainage capacity optimization overall effect is best.(3)The sediment deposit at the outlet fills the low-lying terrain and makes the outlet bed level rising to reach the seabed elevation under nature condition.(4)The nature absorbability and erode has a certain erode effect but can’t solve the outlet sediment deposit problem.After pumping improvement,the outlet sediment deposit problem has been effectively solved.It suggests that the pumping discharge of the design scheme selects 5m3/s and the pumping discharge of the optimization scheme selects 5.5m3/s.