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Flow separation of currents in shallow water

January 1, 1989

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 Year 1989
Title Flow separation of currents in shallow water
Authors Richard P. Signell
Publication Type Conference Paper
Publication Subtype Conference Paper
Index ID 70015275
Record Source USGS Publications Warehouse
USGS Organization Woods Hole Coastal and Marine Science Center