Numerical Simulation Study And Stability Analysis On The Maintenance Of Artificial Cape Bay Beach

At present,the artificial beach cultivation is an effective way to protect the coast,which can give a protection to the eroding coastline,and also change the shape of the beach according to people's needs.In this paper,combining with the Rizhao Port Bank and Beach Restoration Project,through numerical simulations and other methods,calculations and discussions are conducted to study the changes of tidal current,waves and shoreline before and after the construction of artificial headland.As the country pays more and more attention to coastal protection work and people's demand for coastal tourism is increasing,Rizhao City,in conjunction with its own urban development,has retreated from the sandy shoreline occupied by the northern end of Rizhao Port in the last century to construct the port coastline sea area.The port returns to the sea,restoring the beach attributes of the shoreline.Finally,the project recommended the construction of an artificial cape bay to achieve the purpose of shaping the beach outside Rizhao Port through preliminary data surveys and research demonstrations.The research proposal is to build a 1440 m long arc breakwater on the south side of Rizhao Port as the head of the headland,and form a new artificial headland landscape with the shoreline.Based on the data of meteorological,hydrological,landform and sediment in the study area,this paper carried out the research of the water depth change trend of the study area,the characteristics of the seabed sediment activity,and obtained the characteristics of the evolution law of the beach and seabed in the study area;Based on the study of numerical prediction model and equilibrium Cape bay model,the variation of current field and wave field,as well as the long-term evolution trend of coastline before and after the implementation of the research scheme are obtained.Combined with the follow-up monitoring results after the implementation of the research plan,the seabed sediment changes after the completion of the artificial headland and the changes in water depth before and after the typhoon transit are analyzed.The results show that the recommended research plan is more reasonable and the research method used is scientific.By comparing the water depth data,before the construction of the breakwater,the 5m isobath is used as the boundary,showing the state of upwash and down silt.The sand transport direction on the north side of the coal yard is north to south,and the sand transport direction on the south side of the coal yard is south to north.After the breakwater was built,the direction of sediment transport in the coal yard changed from the middle to both sides.The calculation by numerical modeling also showed the phenomenon of middle erosion on the north and south sides.After the breakwater was built and the sand was artificially filled,the sediments in the study area changed significantly,and the seafloor topography showed a state of outward siltation.After experiencing a strong typhoon,the overall change of the seafloor topography did not change much,indicating that the breakwater construction is reasonable and the bank stability is relatively stable.Well,it meets the design expectations.