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On the modification of tides in shallow water regions by wind effects

Jones, J. Eric; Davies, Alan M.. 2008 On the modification of tides in shallow water regions by wind effects. Journal of Geophysical Research, 113 (C5), Art. No. C05014. 10.1029/2007JC004310

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Abstract/Summary

The influence of non-linear effects upon tides in shallow coastal regions, due to the presence of a significant storm surge is examined using a two-dimensional model of the west coast of Britain. The model has an unstructured grid, designed to have a high resolution mesh in the near coastal region of the eastern Irish Sea, the area chosen as the focus of this study. The influence of tide-surge interaction upon the M2, M4 and M6 components of the tide, due to surges produced by steady uniform wind stresses is examined in detail. Calculations show that in deep regions the tide is unaffected by the surge. However, in shallow coastal regions there is significant modification of tidal elevations and currents. This arises because of changes in bottom stress, and the non-linear interaction term in the hydrodynamic equations. In addition the locations of regions that “wet and dry” are changed during the tidal cycle due to the influence of the surge. This gives rise to significant spatial variations and changes in magnitude of the tide and its higher harmonics depending upon wind stress direction and water depth. These results explain why tidal energy remains in the surge residual in shallow water when it is computed by de-tiding the total signal using a tide only calculation; an effect often found in observed surge residuals

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2007JC004310
Programmes: Oceans 2025 > Next generation ocean prediction systems
ISSN: 0148-0227
Additional Information. Not used in RCUK Gateway to Research.: An edited version of this paper was published by AGU. Copyright 2008 American Geophysical Union. Jones, J. Davies, A. (2008) On the modification of tides in shallow water regions by wind effects, Journal of Geophysical Research, 113, C5, DOI 10.1029/2007JC004310 To view the published version open abstract, go to http://dx.doi.org and enter the DOI.
Additional Keywords: FINITE ELEMENT METHOD; STORM SURGES; UNITED KINGDOM; WEST COAST; WAVE-CURRENT INTERACTION; EASTERN IRISH SEA; STORM INDUCED CURRENTS; DRIVEN CIRCULATION; CONTINENTAL SHELF; TAGUS ESTUARY; MODEL; SURGES; HYDRODYNAMICS
NORA Subject Terms: Marine Sciences
Date made live: 09 Feb 2009 15:56
URI: http://nora.nerc.ac.uk/id/eprint/5402

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