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- 저자 : Benetazzo, Alvise (검색결과 1 건)
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Characterizing the signature of a spatio-temporal wind wave field
Benetazzo, Alvise,Bergamasco, Filippo,Yoo, Jeseon,Cavaleri, Luigi,Kim, Sun-Sin,Bertotti, Luciana,Barbariol, Francesco,Shim, Jae-Seol Elsevier 2018 Ocean modelling Vol.129 No.-
<P><B>Abstract</B></P> <P>This study aims at characterizing the distinctive features of a spatio-temporal nonlinear wave surface. We analyze wind-generated 3-D wave fields observed during the passage of an atmospheric front, which led to a wide directional spreading of wave energy. Data were acquired from the ocean research station <I>Socheongcho-ORS</I> (Yellow Sea) with a stereo wave imaging system. They include 3-D (i.e. 2-D + time) measurements of the sea surface elevation with high spatial and temporal resolution over a swath larger than any previous similar deployment. We examine the shape and the nonlinear properties of the wavenumber/frequency 3-D wave spectrum, and the characteristic spatial, temporal and spatio-temporal length scales of the wave field. We then focus on analyzing the probability of occurrence and the spatio-temporal size of the rogue waves we identified in the data. In particular, we provide for the first time an empirical estimate of the extent of the horizontal sea surface spanned by rogue waves. We also propose and assess a novel strategy to determine from the 3-D wave spectrum the vertical current profile, to be then used to map the spectrum on intrinsic frequencies.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We analysis the signature of a spatio-temporal wave field. </LI> <LI> Wave data were collected using a stereo wave imaging system deployed in the Yellow Sea. </LI> <LI> The likelihood and 3-D size of rogue waves is inferred from observations. </LI> </UL> </P>
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