| As the junction of the ocean and the continent,the bay usually contains rich material resources and is one of the key areas for human development.Due to the particularity of its geographical location,it is affected by typhoons of different strength every year,causing serious economic losses.Therefore,it is of great practical significance to study and analyze the wave process and wave field distribution characteristics of the bay during typhoons for the prevention and mitigation of typhoon wave disasters.In this paper,the MIKE21 SW wave model and the Holland typhoon model are used to simulate the wave change process during the typhoon Talim.The influence of each wave parameter in the model on the simulation results is discussed,combined with the measured wave elements during the typhoon.On the basis of rationalizing the parametric wave model the typhoons affecting the Sanmen Bay are divided into landing typhoon,turning typhoon,turning after landing typhoon,open sea turning typhoon and westward moving typhoon.The typical typhoons representing these five paths are simulated by wave numerical model,namely,landing typhoon Matsa,turning typhoon Jangmi and Talim,turning after landing typhoon Krosa,open sea turning typhoon Trami and westward moving typhoon Haima.Based on typhoon Matsa and typhoon Jangmi,the wave characteristics of Sanmen Bay under the influence of landing typhoon and turning typhoon under the same typhoon intensity are studied by equidistant translation.Based on the above research content,the main conclusions are as follows:(1)In the MIKE21 SW model,the wave parameters that have the greatest influence on the simulated significant wave height of typhoon waves in the Sanmen Bay area are wave-wave nonlinear interaction.The sensitivity of the deeper water depth to the wave parameters is less than that of the shallower water depth.After selecting the reasonable parameters,the simulated values are in good agreement with the measured values.(2)During the influence of typhoons with different paths on the Sanmen Bay,the significant wave height and wind speed in the sea area showed a relatively consistent trend.The wave direction was greatly affected by the wind direction and terrain,mainly concentrated in the northeast and north directions,and there was no obvious change rule.The typhoon landing on the southwest side of the Sanmen Bay has a greater impact on the sea area than the typhoon landing on the northeast side.The influence of the turning typhoon on the significant wave height in the sea area is mainly related to the distance between the typhoon path and the study area.(3)The wave energy spectrum of landing typhoon Matsa and turning after landing typhoon Krosa is single-peaked dominated by wind waves.The energy density of typhoon Matsa is mainly concentrated in the NNE-E direction,and the energy density of typhoon Krosa is mainly concentrated in the NE-SE direction.The wave energy spectrum of turning typhoon Jangmi and Talim is double-peaked,and the wave is a combination of swell and wind wave,the wind wave is in a dominant position,and the energy density is mainly concentrated in the N-ENE direction.The wave energy spectrum of westward moving typhoon Haima is single-peaked dominated by wind waves,accompanied by a small amount of swell.The wave energy spectrum of open sea turning typhoon Trami is single-peaked dominated by swell.The energy density of typhoon Haima and Trami is mainly concentrated in NE-SE direction. |
