Abstract:
Based on the encrypted unstructured triangular grids and the driven wind that combined the Holland typhoon model with sea surface wind product by National Centers for Environmental Prediction (NCEP), the third generation wave model Simulation Wave Nearshore (SWAN) is used to simulate typhoon Nesat and Talim affecting Eastern Fujian in 2017. The simulated results are compared with the measured data from mooring buoys. The research shows that the numerical simulation values of wind speed and typhoon waves are in good agreement with the measured data. Synthetic wind field can better simulate the process of wind speed change during typhoon. SWAN model can reasonably reproduce the spatial and temporal distribution of typhoon waves in the coast of Eastern Fujian. The results show that when Nesat typhoon center crossed the Taiwan Island and entered the northern sea of the Taiwan Strait, the wave field distributed in an NE-SW elliptical shape confined by the channel topography. During the time, the sea surface wave height in the north is higher than that in the south. A wide range of very rough sea to high sea formed over the coastal sea. Super typhoon Talim did not land on the Eastern Fujian. When the typhoon center was closest to the mainland, the distribution of the sea surface wave field was consistent with the structure of the typhoon wind field. The wave height of the sea near the typhoon center is above 14 meters. Very rough sea distributed in Eastern Fujian coastal waters. The results can provide technical support and reference for the early warning and emergency management of typhoon waves in the coastal areas of Eastern Fujian.