PROPAGATION OF BAROTROPIC VORTICES OVER TOPOGRAPHY IN A ROTATING TANK

被引:123
作者
CARNEVALE, GF
KLOOSTERZIEL, RC
VANHEIJST, GJF
机构
[1] UNIV CALIF SAN DIEGO, INST NONLINEAR SCI, LA JOLLA, CA 92093 USA
[2] EINDHOVEN UNIV TECHNOL, DEPT TECH PHYS, 5600 MB EINDHOVEN, NETHERLANDS
关键词
D O I
10.1017/S0022112091000411
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
A small-scale cyclonic vortex in a relatively broad valley tends to climb up and out of the valley in a cyclonic spiral about the centre, and when over a relatively broad hill it tends to climb toward the top in an anticyclonic spiral around the peak. This phenomenon is examined here through two-dimensional numerical simulations and rotating-tank experiments. The basic mechanism involved is shown to be the same as that which accounts for the northwest propagation of cyclones on a beta-plane. This inviscid nonlinear effect is also shown to be responsible for the observed translationary motion of barotropic vortices in a free-surface rotating tank. The behaviour of isolated vortices is contrasted with that of vortices with non-vanishing circulation.
引用
收藏
页码:119 / 139
页数:21
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