Numerical studies of internal waves at a sill: sensitivity to horizontal grid size and subgrid scale closure

Berntsen, J.; Xing, J.; Davies, Alan. 2008 Numerical studies of internal waves at a sill: sensitivity to horizontal grid size and subgrid scale closure. Continental Shelf Research, 28 (10-11). 1376-1393. https://doi.org/10.1016/j.csr.2008.03.029

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Abstract/Summary

Abstract: A non-hydrostatic terrain following model in cross sectional form is applied to study the generation and propagation of tidally forced internal waves near a sill in an idealized loch. On inflow internal waves are generated behind the sill, and they propagate from the sill. There is a transfer of energy from the barotropic tide to internal waves and then to irreversible mixing. The range of length scales involved goes from the scale of the forced tide to scales associated with wave breaking. This wide range of scales makes it very difficult to resolve all relevant length scales with a numerical model using a uniform finite difference grid. The sensitivity of the numerical results to the grid resolution and the parameterisation of subgrid scale mixing is investigated. Initial calculations are performed with constant values of viscosity and diffusivity, and subsequently they are repeated using large eddy simulations and including Richardson number dependant vertical mixing.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.csr.2008.03.029
Programmes:	Oceans 2025 > Next generation ocean prediction systems
ISSN:	0278-4343
Additional Keywords:	NON HYDROSTATIC; OCEAN MODELLING; TIDES; SILLS; INTERNAL WAVES; GRID RESOLUTION; MIXING; COORDINATE OCEAN MODELS; KNIGHT INLET SILL; PRESSURE GRADIENT FORCE; STRATIFIED TIDAL FLOW; ARCTIC FJORD; LEE WAVES; TOPOGRAPHY; BREAKING; CIRCULATION; STORFJORDEN
NORA Subject Terms:	Marine Sciences
Date made live:	16 Feb 2009 12:45 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/5367

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