Study On Numerical Simulation Of The Tidal Currents Wind,Waves And Its’ Coupling Effects In Fangchenggang Sea Area

Fangchenggang,which is one of the most important harbor along the coast of Guangxi Province,plays an irreplaceable role in the economic development of Guangxi Province.However,the tidal current and wind wave problem of Fangchenggang sea area is closely related with the development and utilization of coastal resources in the region.Therefore,it is of great significance to carry out the revelant research for the construction of Fangchenggang sea,coastal protection,and offshore resources development.In this paper,based on the advantages of MIKE21 FM hydrodynamic model and MIKE21 SW model,the field distribution features of tidal and wind-driven waves of Fangchenggang sea and the influence of single coupling and bidirectional coupling on Coupled Model are researched.Firstly,based on the MIKE21 FM hydrodynamic model,the two-dimensional vertical average tidal flow mathematical model of the Fangchenggang sea area was established in this paper;based on the collected data of the Fangchenggang sea,the numerical simulation of whole Fangchenggang range was carried out and the the model flow was verified to the tidal,current velocity;the general rules and characteristics of Fangchenggang sea area in the process of spring and neap tides were analyzed;the hydrodynamic model is applied to the project for analysis in order to test the rationality and scientificity of the model.Secondly,based on the MIKE21 SW wave model,the Fangchenggang sea wave model was established based in this paper;based on the statistical data of waves,different designed levels,different wind direction and different recurrence period combination conditions for the Fangchenggang sea model are considered and designed,the wave characteristics of Fangchenggang sea was simulated and the result of the sea waves’ distribution field was obtained;and the wind wave model was applied for the effect of the project’ fields analysis to test the practicability and rationality of the model in engineering.Finally,based on the MIKE21 FM hydrodynamic current and wave single coupling model,the effect of the wave fields generated by wind to the hydrodynamic process of spring,neap tides were researched and analyzed.Based on the MIKE21 SW wind wave and current single coupling model,the influence of spring and neap tidal dynamic factors to the wave field generated by wind were researched and analyzed.Based on the Coupled Integrated Models of the bidirectional coupling model,the influence of current field affected by the bidirectional coupling model to the current,wave single coupling model and the influence of current field affected by the bidirectional coupling model to the waves,current single coupling model were analyzed respectively.The numerical simulation of wind wave results and single,bidirectional coupling in the Fangchenggang sea filled up the research of the physical oceanography in Fangchenggang offshore sea;provide a scientific basis for the development of marine resources and coastal protection in Fangchenggang’s engineering construction,and provide research ideas and reference for similar studies of the Fangchenggang sea in the future.