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contributor authorSmith, Ronald B.
contributor authorSmith, David F.
date accessioned2017-06-09T14:32:49Z
date available2017-06-09T14:32:49Z
date copyright1995/02/01
date issued1995
identifier issn0022-4928
identifier otherams-21380.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4157713
description abstractNumerical solutions to the shallow-water equations are used to examine the generation of wake vorticity as a cyclone drifts past a mountain. In cases with sufficient vortex strength. mountain height, and vortex-mountain proximity, the flow becomes supercritical over the mountain and hydraulic jumps generate wake vorticity. The dissipative vorticity transport in jumps modifies the usual vorticity integral constraints for inviscid shallow-water flow regarding potential enstrophy, vorticity centroid, and vortex size. The increase in vortex size during wake formation represents a weakening of the vortex. These changes, and the macroscopic flow patterns, are independent of the viscosity coefficient. The generation of vertical vorticity within a viscous jump, and the associated Bernoulli loss, arise from a shear stress induced at the sloping upper interface of the layer and transmitted down through the layer by a secondary flow. Applied to the problem of a typhoon drifting past Taiwan, the shallow-water equations capture many of the observed phenomena such as upstream blocking, downstream sheltering, corner winds, and foehn and secondary vortex formation.
publisherAmerican Meteorological Society
titlePseudoinviscid Wake Formation by Mountains in Shallow-Water Flow with a Drifting Vortex
typeJournal Paper
journal volume52
journal issue4
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/1520-0469(1995)052<0436:PWFBMI>2.0.CO;2
journal fristpage436
journal lastpage454
treeJournal of the Atmospheric Sciences:;1995:;Volume( 052 ):;issue: 004
contenttypeFulltext


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