Transverse structure of turbulence in a rotating gravity current

Details Transverse structure of turbulence in a rotating gravity current Transverse structure of turbulence in a rotating gravity current

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3408601u&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 8, CiteID L08601

Physics

8

Oceanography: Physical: Overflows, Oceanography: Physical: Coriolis Effects, Oceanography: Physical: Fine Structure And Microstructure, Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes (4490)

Scientific paper

Synoptic, high-resolution, measurements of turbulent kinetic energy dissipation, current velocity and water column stratification across a fast (up to 0.7 m s-1) oceanic saline gravity current are presented. Our data provide, for the first time, a detailed two-dimensional picture of the turbulence structure inside a gravity current. Strong boundary-layer and interfacial turbulence can be distinguished from a quiet core, and a strong asymmetry of mixing near the outer edges of the gravity current is apparent. This asymmetry is mirrored by the computed entrainment velocities, varying approximately by a factor of 5 across the gravity current. It is argued that the asymmetry is due to rotational effects that can be clearly identified also in the velocity and density fields.

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