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Citation: Dongxue MO, Yahao LIU, Yijun HOU, Ze LIU. Bimodality and growth of the spectra of typhoon-generated waves in northern South China Sea. ACTA OCEANOLOGICA SINICA,

Bimodality and growth of the spectra of typhoon-generated waves in northern South China Sea

1.  CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.  Laboratory for Ocean Dynamics and Climate, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
3.  University of Chinese Academy of Sciences, Beijing 100049, China
4.  Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China

Web Publishing Date: 2019-11-01

Buoy-based observations of wave spectra during the passage of three typhoons in the northern South China Sea are examined. Though most spectra of mature typhoon-generated waves are unimodal, double-peaked spectra account for a significant proportion during the growing and decaying stages. This is due either to the superposition of swells on local wind waves or to the mechanism of nonlinear interaction between different wave components. The growth rate of energy density is an effective way to predict spectrum variation. The dominant wave direction depends on the location of the typhoon center to the site, but the direction spread shows no regularity in distant regions. In this study, a new six-parameter spectral formula is proposed to represent double-peaked spectra and is shown to provide a better fit than previous models. The theoretical relationship between shape parameter and spectral width is still applicable to each peak. The characteristics of the variations of spectral parameters are analyzed. It is demonstrated that the spectral parameters are not only related to the typhoon intensity and typhoon track, but also have strong intercorrelations. Moreover, the growth relation between significant wave height and significant wave period is obtained to fit the typhoon-generated waves.

Key words: double peak , South China Sea , spectral parameters , typhoon , wave spectrum

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Bimodality and growth of the spectra of typhoon-generated waves in northern South China Sea

Dongxue MO, Yahao LIU, Yijun HOU, Ze LIU