Nonlinear waves in marginally stable flows of Antarctic Bottom Water

5th All-Russian Conference with International Participation POLAR MECHANICS

地球科学;力学

Makarenko, N.I.^1,2 ; Maltseva, J.L.^1,2 ; Morozov, E.G.^3 ; Tarakanov, R.Yu.^3 ; Ivanova, K.A.^4

Lavrentyev Institute of Hydrodynamics, Lavrentyev pr. 15, Novosibirsk

630090, Russia^1

Novosibirsk State University, Pirogova st. 2, Novosibirsk

630090, Russia^2

Shirshov Institute of Oceanology, Nakhimovski pr. 36, Moscow

117997, Russia^3

Aix-Marseille University, Marseille

06, France^4

关键词: Antarctic Bottom Water;    Boussinesq parameter;    Exponential stratification;    Field observations;    Interfacial velocities;    Kelvin- helmholtz instabilities;    Mathematical formulation;    Scaling procedures;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/193/1/012041/pdf
DOI  :  10.1088/1755-1315/193/1/012041

学科分类：力学，机械学

来源: IOP

【 摘 要 】

In this paper, we study internal waves and stratified flows in the Romanche Fracture Zone of the Mid Atlantic Ridge. Theoretical analysis involves mathematical formulation of stratified flows which uses LADCP- and CTD-data obtained from field observation in the cruises of RV Akademik Sergey Vavilov. We discuss the 2.5-layer model of the fluid with exponential stratification of both layers. The long-wave approximate model describing travelling waves is constructed by means of scaling procedure with a small Boussinesq parameter. It is demonstrated that solitary wave regimes can be affected by the Kelvin - Helmholtz instability arising due to interfacial velocity shear in upstream flow.