On the importance of non-hydrostatic processes in determining tidally induced mixing in still regions

Xing, J.; Davies, A. M.. 2007 On the importance of non-hydrostatic processes in determining tidally induced mixing in still regions. Continental Shelf Research, 27 (16). 2162-2185. 10.1016/j.csr.2007.05.012

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Abstract/Summary

The importance of using a non-hydrostatic model to compute tidally induced mixing and flow in the region of a sill is examined using idealized topography representing the sill at the entrance to Loch Etive. This site is chosen since detailed measurements were recently made there. Calculations are performed with and without the inclusion of non-hydrostatic dynamics using a vertical slice model for a range of sill widths corresponding to typical sill regions. Initial non-hydrostatic calculations showed that the model could reproduce the observed flow characteristics in the region. However, when calculations were performed using the model in hydrostatic form, the significant artificial convective mixing that occurred in order to remove density inversions led to excessively high vertical mixing. This influenced the computed temperature field and the intensity of the current jet that separated from the sill on its lee side. In addition it affected the magnitude and spatial characteristics of the lee waves generated on the lee side of the sill. Calculations with a range of sill widths, showed that as the sill width decreased the difference between the solution computed with the non-hydrostatic and hydrostatic model increased

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1016/j.csr.2007.05.012
Programmes:	Oceans 2025 > Integration of sustained observations
ISSN:	0278-4343
Additional Keywords:	HIJ ISI REF AJWNOV07 NISCNOV07 OPM2007 AR0708 THEME 9 WP 9.1 PROG2 LLH9101 JOURNAL CORRUGATED CONTINENTAL SLOPE MIXING INTERNAL WAVES NON HYDROSTATIC MODEL SILL INTERNAL TIDES SOLITARY WAVES SHELF EDGE NORTH SEA MODEL FLOW GENERATION OCEAN TOPOGRAPHY
NORA Subject Terms:	Marine Sciences
Date made live:	07 Oct 2008 12:39 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/2714

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