Laboratory simulations of coastally trapped waves with rotation, topography and stratification

Details Laboratory simulations of coastally trapped waves with rotation, topography and stratification Laboratory simulations of coastally trapped waves with rotation, topography and stratification

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dyato..39..153b&link_type=abstract

Dynamics of Atmospheres and Oceans, Volume 39, Issue 3-4, p. 153-173.

Computer Science

1

Scientific paper

We describe observations of the generation and propagation of coastally trapped waves in the laboratory and their comparison with theory, over a range of values of several experimental parameters. The topography and stratification used consisted of a sloping continental shelf and vertical continental slope with three-layer stratification that could be approximated by an extended version of the Gill and Clarke model [Gill, A.E., Clarke, A., 1974. Wind-induced upwelling, coastal currents and sea level changes. Deep Sea Res. 21, 325 345]. The latter was modified to accommodate a central mixed layer, curved geometry, and friction on the shelf. This configuration represents coastal geometry with large Burger number. The experiments were successful in realizing coastally trapped waves that were consistent with the theoretical expectations. However, the waves propagated more slowly, and for narrow shelves were damped more rapidly than predicted by the theory. The first was attributed to: (i) the effect of stratification on fluid on the shelf, reducing the topographic Rossby wave effect; (ii) the parameterization of the viscosity. The second difference was attributed to the mechanism of generation: the paddle used did not always generate sinusoidal waves, and the subsequent dispersion resulted in a net loss of amplitude.

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