The long-wave potential-vorticity dynamics of coastal fronts
The long-wave potential-vorticity dynamics of coastal fronts
复制标题
沿海锋面长波位涡动力学
DOI:
10.1017/jfm.2020.30
复制
发表时间:
2020
影响因子:
3.7
通讯作者:
Jamshidi S
中科院分区:
文献类型:
--
作者:
Jamshidi S
This paper studies the propagation of free, long waves on a potential vorticity front in the presence of a vertical coast, using a -layer, quasi-geostrophic model with piecewise-constant potential vorticity. The coastal boundary induces flow through image vorticity and a Kelvin wave, either of which can reinforce or oppose the Rossby wave dynamics at the front. The behaviour of the front depends strongly on the relative strengths of these three mechanisms, which are explicit in our model. The richest behaviour, which includes kink solitons (under-compressive shocks) and compound-wave structures, occurs in the regime where vortical effects are dominant. The evolution of the front is described by a fully nonlinear finite-amplitude equation including first-order dispersive effects, which is related to the modified Korteweg–de Vries equation. The different behaviours are classified using the canonical example of the Riemann problem, which we analyse using El’s technique of ‘dispersive shock-fitting’. Contour-dynamic simulations show that the dispersive long-wave theory captures the behaviour of the full quasi-geostrophic system to a high degree of accuracy.
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DOI:
--
发表时间:
1986
期刊:
影响因子:
--
作者:
L. Pratt;M. Stern
通讯作者:
M. Stern
影响因子:
3.7
作者:
E. Johnson;O. Southwick;N. R. McDonald
通讯作者:
E. Johnson;O. Southwick;N. R. McDonald
影响因子:
--
作者:
M. Hoefer;M. Ablowitz
通讯作者:
M. Ablowitz
DOI:
--
发表时间:
1988
期刊:
影响因子:
--
作者:
D. Dritschel
通讯作者:
D. Dritschel
影响因子:
3.7
作者:
G. El;R. Grimshaw;N. F. Smyth
通讯作者:
N. F. Smyth