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Hall, Rob A. 
ORCID: https://orcid.org/0000-0002-3665-6322, Huthnance, John M. and Williams, Richard G.
(2013)
Internal wave reflection on shelf slopes with depth-varying stratification.
Journal of Physical Oceanography, 43 (2).
pp. 248-258.
ISSN 0022-3670
Abstract
Reflection of internal waves from sloping topography is simple to predict for uniform stratification and linear slope gradients. However, depth-varying stratification presents the complication that regions of the slope may be subcritical and other regions supercritical. Here, a numerical model is used to simulate a mode-1, M2 internal tide approaching a shelf slope with both uniform and depth-varying stratifications. The fractions of incident internal wave energy reflected back offshore and transmitted onto the shelf are diagnosed by calculating the energy flux at the base of slope (with and without topography) and at the shelf break. For the stratifications/topographies considered in this study, the fraction of energy reflected for a given slope criticality is similar for both uniform and depth-varying stratifications. This suggests the fraction reflected is dependent only on maximum slope criticality and independent of the depth of the pycnocline. The majority of the reflected energy flux is in mode 1, with only minor contributions from higher modes due to topographic scattering. The fraction of energy transmitted is dependent on the depth-structure of the stratification and cannot be predicted from maximumslope criticality. If near-surface stratification is weak, transmitted internal waves may not reach the shelf break because of decreased horizontal wavelength and group velocity.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | slope,internal waves,general circulation models |
| Faculty \ School: | Faculty of Science > School of Environmental Sciences |
| UEA Research Groups: | Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences Faculty of Science > Research Groups > Marine and Atmospheric Sciences (former - to 2017) Faculty of Science > Research Groups > Meteorology, Oceanography and Climate Dynamics (former - to 2017) Faculty of Science > Research Groups > Climate, Ocean and Atmospheric Sciences (former - to 2017) Faculty of Science > Research Groups > Collaborative Centre for Sustainable Use of the Seas |
| Related URLs: | |
| Depositing User: | Pure Connector |
| Date Deposited: | 05 Aug 2013 13:52 |
| Last Modified: | 24 Oct 2022 04:29 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/43109 |
| DOI: | 10.1175/JPO-D-11-0192.1 |
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