Freakish sea state and swell-windsea coupling: Numerical study of the Suwa-Maru incident

Details Freakish sea state and swell-windsea coupling: Numerical study of the Suwa-Maru incident Freakish sea state and swell-windsea coupling: Numerical study of the Suwa-Maru incident

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3601607t&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 1, CiteID L01607

Physics

Geophysics

11

Oceanography: Physical: Surface Waves And Tides (1222), Oceanography: General: Numerical Modeling (0545, 0560), Nonlinear Geophysics: Nonlinear Waves, Shock Waves, Solitons (0689, 2487, 3280, 3285, 4275, 6934, 7851, 7852)

Scientific paper

On 23 June 2008, a fishing boat with 20 crewmembers onboard sank in reportedly moderate sea-state conditions in the Kuroshio Extension region east of Japan. To determine the sea state at the time of the incident, we conducted a hindcast wave simulation, as realistically as possible, using an improved third-generation wave model driven by wind and current reanalysis products. Our results indicated that at the time of the accident, the wave steepness increased and the spectral peakedness narrowed, creating a sea state favorable for freak wave occurrence due to quasi-resonance. Detailed analyses of the spectral evolution revealed that nonlinear coupling of swell and windsea waves was the key to generating the narrow spectrum. Under the influence of rising wind speed, the swell system grew exponentially at the expense of the windsea energy, and the bimodal crossing sea state transformed into a freakish unimodal sea.

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