Research On The Evolution Mechanism Of The Wave Spatial And Temporal Distribution Heterogeneity In The Maritime Area Near The Island

China is a major maritime country,with a coastline of 18,000 kilometers on the mainland and an area of more than 500 square meters on more than 6,900 islands,with a total area of about 3 million square kilometers under its jurisdiction.Whether it is at home or abroad,as people continue to research and develop the ocean,the actual engineering cases of near island reef engineering development and structural construction on the reef floor are becoming more and more.However,the wave propagation process is very complicated because of the existence of complex and diverse seafloor topography,shielding effect near the island and reef,etc.When the wave propagates from deep water to the shallow water area near the island and reef,wave diffraction,reflection,Complex conditions such as refraction may also cause energy consumption due to bottom friction and wave breaking.The problem of how to accurately and reliably predict the wave propagation and evolution law of waves near islands and reefs in the target sea area of the South China Sea under different temporal and spatial distributions needs to be resolved.Among the various numerical models for calculating wave evolution,the SWAN model has its unique advantages and has become one of the more popular choices.In the simulation process of SWAN model,it can not only accurately simulate the change course of waves in the complex external environment such as wind field change,different landforms and tidal current field change,but also calculate the mixing of wind waves and surging waves.At the same time,another advantage of the SWAN model is that it can flexibly handle boundary conditions.The model provides two representations of spectral forms and wave elements.Through self-nesting optimization,it can avoid complex problems such as the need to redefine interface settings for different software nesting,significantly improve computing efficiency,and effectively solve the South China Sea The numerical accuracy problem caused by the dramatic changes in the terrain near the islands and reefs significantly improves the calculation accuracy.In this paper,the self-nesting optimization technique of SWAN model is used to simulate the wave field in the target sea area of the south China sea.Firstly,the typhoon wave field data with significant influence are used as input items,the calculation results are processed and compared with the measured data,and the statistical method is used to verify the correlation of the results.The expected simulation effect is significantly optimized relative to the unnested SWAN model.Then,the wave parameters of the South China Sea from 2015 to 2018 under different time distributions and different spatial distributions are numerically calculated,and the results are summarized to explore the periodic laws in the changes.This paper provides a reference value for the many factors that need to be considered in practical engineering applications by obtaining the mechanism of wave propagation under different temporal and spatial distributions in the areas near the reefs of the South China Sea.