Flow separation of currents in shallow water



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Flow separation of currents in shallow coastal areas is investigated using a boundary layer model for two-dimensional (depth-averaged) tidal flow past an elliptic headland. If the shoaling region near the coast is narrow compared to the scale of the headland, bottom friction causes the flow to separate just downstream of the point where the pressure gradient switches from favoring to adverse. As long as the shoaling region at the coast is well resolved, the inclusion of eddy viscosity and a no-slip boundary condition have no effect on this result. An approximate analytic solution for the pressure gradient along the boundary is obtained by assuming the flow away from the immediate vicinity of the boundary is irrotational. On the basis of the pressure gradient obtained from the irrotational flow solution, flow separation is a strong function of the headland aspect ratio, an equivalent Reynolds number, and a Keulegan-Carpenter number.
Publication type Conference Paper
Publication Subtype Conference Paper
Title Flow separation of currents in shallow water
ISBN 0872627586
Year Published 1989
Language English
Publisher American Society of Civil Engineers
Publisher location Boston, MA, United States
Contributing office(s) Woods Hole Coastal and Marine Science Center
First page 278
Last page 290
Conference Title Estuarine and Coastal Modeling - Proceedings of the Conference
Conference Location Newport, RI
Conference Date November 15-17, 1989
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