Effect of wave-current interaction on wind-driven circulation in narrow, shallow embayments

Journal of Geophysical Research C: Oceans
By: , and 

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Abstract

The effect of wind waves on the steady wind-driven circulation in a narrow, shallow bay is investigated with a two-dimensional (yz) circulation model and the Grant and Madsen [1979] bottom-boundary layer model, which includes wave-current interaction. A constant wind stress is applied in the along-channel x direction to a channel with a constant cross-sectional profile h(y). The wind-induced flushing of shallow bays is shown to be sensitive to both the shape of the cross section and the effects of surface waves. The flushing increases with increasing inline image, where h′ is the standard deviation of cross-channel depth and inline image is the mean depth. This is consistent with the findings of Hearn et al. [1987]. The flushing decreases, however, with the inclusion of surface wave effects which act to increase the bottom drag felt by the currents. Increasing effective bottom friction reduces the strength of the circulation, while the along-bay surface slope, bottom stress and the structure of current profiles remain nearly unchanged. An implication of the circulation dependence on wave-current interaction is that low-frequency oscillatory winds may drive a mean circulation when the wave field changes with wind direction.


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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Effect of wave-current interaction on wind-driven circulation in narrow, shallow embayments
Series title Journal of Geophysical Research C: Oceans
DOI 10.1029/JC095iC06p09671
Volume 95
Issue 6
Year Published 1990
Language English
Publisher American Geophysical Union
Contributing office(s) Woods Hole Coastal and Marine Science Center, Coastal and Marine Geology Program
Description 8 p.
First page 9671
Last page 9678
Online Only (Y/N) N
Additional Online Files (Y/N) N