Wave Numerical Simulation Study Of Typical Sea Area

China holds long shore line and wide sea area, but often suffers from the typhoon waves. The Yellow and East Seas are frequently affected by the typhoon waves, so numerical typhoon wave simulation and prediction is not only valuable in the research of wind-wave interaction, but also significant to coastal engineering, navigation, fishery, oil spill simulation, SAR (search and rescue).The method of numerical simulation is used in this paper, and wind-wave interaction, nonlinear wave-wave interaction, whitecapping dissipation and bottom friction are fully considered, a international advanced third-generation wave model, WAVEWATCH-III(henceforth denoted as WW3), is adopted to simulate the wave field of Yellow and East Seas, then the significant wave heights (henceforth denoted as SWH) from the model are compared with the TOPEX/Poseidon (henceforth denoted as T/P) satellite altimeter SWH data. The numerical experimentation scheme is designed to study the current field and water level's effects on the wave. Finally, high resolution grid is used to simulate the wave field of typical sea area (Zhoushan island sea area) to provide technical support for Zhoushan sea area.Three typical typhoons (9711 Winnie, 0205 Rammasun and 0414 Rananim) are modeled, the SWH from the model are compared to the T/P altimeter SWH data. The result indicates the following conclusions: when the precision of input wind field is a little high, the simulated SWH are consistent to T/P altimeter SWH data, the correlation coefficient of them is quite ideal, but the simulated SWH are systematically lower than the T/P altimeter SWH data, especially in the near-shore area; when the precision of input wind field is a little low, although the model can basically simulate the distribution of the SWH, the obvious error exists between the model results and T/P altimeter data, accordingly, the precision of the wind field is the key to simulated results; In all, the simulated results of WW3 is rather close to the T/P altimeter data, WW3 can precisely simulate the SWH distribution ofYellow and East Seas.Winnie typhoon is chosen as the study object to study the current field and water level's effects on the wave by combining the former results of our research group. The result indicates that the current field and water level have some contribution to the model results, this research laid a solid foundation to develop the ocean-atmosphere-wave coupling model.Finally, two notable typhoons, which badly affect the Zhoushan sea area, are chosen as study examples, and high resolution grid is used to simulate the wave field of Zhoushan sea area. The model results basically reflect the distribution of the wave field, but in the near-shore area, the SWH are a little lower, the main reason may be that refraction, diffraction and dept-induced breaking are not considered in the model. The study the bottom friction's effect on near-shore wave simulation shows that, in off-shore deep water, the effect of bottom friction can be overlooked, however, in near-shore shallow water, the effect is very obvious.