Abstract
The exchange flow between a marginal sea or estuary and the open ocean is often approximated using two-layer stratification. Two-layer models are most convincing when the interfacial region separating the upper and lower fluids is relatively thin. The exchange flow in the Strait of Gibraltar exhibits this behavior, at least at certain locations and times (Figure I.9). The vertical density and velocity profiles taken near the Camerinal Sill show a relatively sharp transition between slab-like upper and lower water masses. Elsewhere, the Gibraltar interface can be thicker and can contribute significantly to the overall mass budget for the strait. The Bab al Mandab (BAM) exchange flow experiences variations throughout the water column that are quite continuous (Figures 1.10.7 and 5.0.1). Under such conditions, a two-layer model might still give guidance provided that motions over the water column are associated with the lowest internal mode of the stratified shear flow.
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Pratt, L.J., Whitehead, J.A. (2007). Two-Layer Flows in Rotating Channels. In: Rotating Hydraulics. Atmospheric And Oceanographic Sciences Library, vol 36. Springer, New York, NY. https://doi.org/10.1007/978-0-387-49572-9_6
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DOI: https://doi.org/10.1007/978-0-387-49572-9_6
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