Numerical Simulation Of Wind Waves And Storm Surges In Pingtan Bay

Typhoons and tropical storms have severe impacts on the region of the south-east coast of China every year.In order to provide some basis for coastal structure design and protection in the future,it is of great significance to investigate the wind waves and storm surges during storm processes.Storm process is related with three major aspects: weather condition,wave condition and current condition.Differences in computing results need to be considered because of the interaction among three.With the development of computational models,coupling models are more and more applied to the storm simulation,so that more accurate results of wave and storm surge variation can be obtained.Therefore,a mesoscale atmospheric model WRF and a wave-current coupling model SWAN+ADCIRC were developed,to simulate and investigate the waves and storm surges in region of Fujian and Taiwan during several storm processes.First of all,an accurate wind and pressure field is needed to be set as driving condition.The availability of Fujita-Takahashi storm model and WRF atmospheric model were compared.Also,the impact of different physical processes and parameters on weather condition was analyzed.By occupying real terrain data,model SWAN and model ADCIRC were used,respectively,to simulate waves and storm surges during three designed typhoons with different paths.It reflected influences on coastal areas due to different paths.By using wave-current coupling model SWAN+ADCIRC,two storm processes were simulated.The validity and accuracy of model was verified by comparing the computing results with measured data.Based on the comparison results,the temporally and spatially varying wave and surge condition were obtained and analyzed in the region of Taiwan Island and Pingtan Bay.According to the statistics,major storm processes in past 10 years were analyzed and 25 storms were simulated.Probability distribution curves of annual peak wave height were obtained for 5 locations along the nearby coast by using Pearson type ?,which is helpful to the construction and protection of coastal structures.