A nonhydrostatic version of FVCOM : 2. Mechanistic study of tidally generated nonlinear internal waves in Massachusetts Bay


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dc.contributor.author Lai, Zhigang
dc.contributor.author Chen, Changsheng
dc.contributor.author Cowles, Geoffrey W.
dc.contributor.author Beardsley, Robert C.
dc.date.accessioned 2011-02-28T19:53:18Z
dc.date.available 2011-06-21T08:25:28Z
dc.date.issued 2010-12-21
dc.identifier.citation Journal of Geophysical Research 115 (2010): C12049 en_US
dc.identifier.uri http://hdl.handle.net/1912/4356
dc.description Author Posting. © American Geophysical Union, 2010. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 115 (2010): C12049, doi:10.1029/2010JC006331. en_US
dc.description.abstract The generation, propagation, and dissipation processes of large-amplitude nonlinear internal waves in Massachusetts Bay during the stratified season were examined using the nonhydrostatic Finite-Volume Coastal Ocean Model (FVCOM-NH). The model reproduced well the characteristics of the high-frequency internal waves observed in Massachusetts Bay in August 1998. The model experiments suggested that internal waves over Stellwagen Bank are generated by the interaction of tidal currents with steep bottom topography through a process of forming a large-density front on the western slope of the bank by the release of an initial density perturbation near ebb-flood transition, nonlinear steepening of the density front into a deep density depression, and disintegrating of the density depression into a wave train. Earth's rotation tends to transfer the cross-bank tidal kinetic energy into the along-bank direction and thus reduces the intensity of the density perturbation at ebb-flood transition and density depression in the flood period. The internal wave packet propagates as a leading edge feature of the internal tidal wave, and the faster propagation speed of the high-frequency internal waves in Massachusetts Bay is caused by Earth's rotation. The model experiments suggested that bottom friction can significantly influence the cross-bank scale of the density perturbation and thus the density depression during wave generation and the dissipation during the wave's shoaling. Inclusion of vertical mixing using the Mellor-Yamada level 2.5 turbulence closure model had only a marginal effect on wave evolution. The model results support the internal wave theory proposed by Lee and Beardsley (1974) but are in disagreement with the lee-wave mechanism proposed by Maxworthy (1979). en_US
dc.description.sponsorship This research was supported by NOAA g r a n t s DOC/NOAA/NA04NMF4720332 and DOC/NOAA/ NA05NMF4721131, U.S. GLOBEC Northwest Atlantic/Georges Bank Program NSF grants (OCE‐0606928, OCE‐0712903, OCE‐0732084, OCE‐0726851, OCE0814505), and MIT Sea Grant funds (2006‐RC‐103 and 2010‐R/RC‐116), NOAA NERACOOS Program for the UMASSD team and the Smith Chair in Coastal Oceanography, and NOAA grant (NA‐17RJ1223) for R.C. Beardsley. C. Chen’s contribution is also supported by Shanghai Ocean University under grants A‐2302‐10‐0003 and 09320503700 and the State Key Laboratory for Estuarine and Coastal Research, East China Normal University. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2010JC006331
dc.subject Nonhydrostatic dynamics en_US
dc.subject Internal waves en_US
dc.subject Stellwagen Bank en_US
dc.subject Massachusetts Bay en_US
dc.title A nonhydrostatic version of FVCOM : 2. Mechanistic study of tidally generated nonlinear internal waves in Massachusetts Bay en_US
dc.type Article en_US
dc.identifier.doi 10.1029/2010JC006331

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