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Some interactions of a vortex with a seamount

McDonald, NR; Dunn, DC; (1999) Some interactions of a vortex with a seamount. NUOVO CIMENTO C , 22 (6) 885 - 898.

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Abstract

The initial value problem for the motion of an equivalent-barotropic vortex which is initially circular and of uniform potential vorticity near a circular seamount of constant height is studied within a quasigeostrophic framework using the method of contour dynamics. Given that the radius of the vortex is equal to the deformation radius, the nature of the interaction depends on four parameters: i) the distance of the vortex from the seamount relative to the deformation radius, ii) the radius of the seamount relative to the deformation radius, iii) the ratio of the non-dimensional height of the seamount relative to the Rossby number of the vortex (or, equivalently, the vortex intensity) and iv) the sense of the vortex circulation. Contour surgery experiments are used to investigate qualitative changes in behaviour of the vortex-seamount system as these parameters are varied. Of particular note is the generation of additional vortex features by the original vortex as it sweeps fluid from the seamount. Moreover, when the original vortex is an anticyclone, dipoles are frequently formed over a nide range of parameter values, which subsequently propagate away from the seamount.

Type:Article
Title:Some interactions of a vortex with a seamount
Keywords:DYNAMICS, TOPOGRAPHY, EDDIES, MERGER, FLOW
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Mathematics

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