Numerical Simulation Of Storm Surge And Suspended Sediment In Zhapo Fishing Harbor

Located in hailing bay,Guangdong province,zhapo fishing port is one of the most important fishing ports in China its location and natural resources conditions are superior.In order to adapt to the development,the port area needs to be upgraded,so it is necessary to analyze the hydrodynamic characteristics and sediment siltation after the project.Based on Delft3d software,a two-dimensional numerical model of storm surge,astronomical tide and wave coupling in zhapo harbor area is established.storm surge caused by 1311 " utor" super typhoon and 1104" haima" tropical storm is simulated.On the premise of verifying the accuracy of the model,a small grid is added to carry out triple nesting to compare and analyze the storm surge in the port area before and after the project.Two schemes were designed,scheme 1 extended the north shore breakwater and removed the breakwater of zhouzi gorge to connect the port and the open sea.Schemes 2 only extends the north shore breakwater.The results show that both schemes can reduce the maximum storm surge value in the harbor area,and scheme 1 is 0.028 m smaller than scheme 2 on average during typhoon "Haima".Scheme 1 was on average 0.021 m smaller than scheme 2 during typhoon "Utor",Scheme 1 is superior to scheme 2 in reducing storm surge.On the basis of numerical simulation,the siltation conditions of scheme 1 and scheme 2 are calculated and predicted by using Luo zhaosen's semi-theoretical and semi-empirical formula and considering only the transport effect of tidal current.The results show that 15 years later,the degree of siltation near the north shore of the port is the highest,and sche,me 2 reaches 0.2m.The thickness of each key siltation area in scheme 2 is larger than that in scheme 1,and the average thickness is 0.01-0.02 m.