Abstract
The wave characteristics in the bay of central coast of Zhejiang are studied based on the AWAC-measured data for 1 year off Sanmen at 7.5 m water depth. The observed wave parameters are analyzed by statistical analysis and linear regression analysis, and moreover the variations of wave parameters and wave spectra in Sanmen Bay under the influence of typhoon are discussed. The results show that: The dominant wave direction and the strong wave direction are both E due to the topography of Sanmen Bay, while the one-tenth wave height (H1/10) is mainly under 0.8 m with a typical Rayleigh distribution of wave height. Due to the influence of typhoon Talim, the maximum wave height (Hmax) of 2.71 m was observed on 14 September 2017. The wave spectra estimated during typhoon Talim are mainly double-peaked, and the sea waves are mixed waves consisting of swells and wind-seas, when the low frequency swells about 0.08 Hz are in a dominant position and the high frequency wind-seas about 0.3 Hz are relatively weak. This study will be important as reference in the design of offshore structures as well as for disaster prevention and mitigation.
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