NDLI: Laboratory Measurement of Entrainment and Mixing in Oceanic Overflows

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Chen, Jun Odier, Philippe Rivera, Michael Ecke, Robert
Abstract	The mixing and entrainment processes existing in oceanic overflows, e.g., Denmark Strait Overflow (DSO), affect the global thermohaline circulation. Owing to limited spatial resolution in global climate prediction simulations, the small-scale dynamics of oceanic mixing must be properly modeled. A series of experiments are performed in an Oceanic Overflow Facility to study the mixing and entrainment of a gravity current along an inclined plate, flowing into a steady ambient medium. At small values of the Richardson number, the shear dominates the stabilizing effect of the stratification and the flow at the interface of the current becomes unstable, resulting in turbulent mixing. In addition, the level of turbulence is enhanced by an active grid device. Using PIV and PLIF to measure, respectively, the velocity and density fields, we characterize the statistical properties of the mixing. We also study the entrainment of the ambient fluid by the flow. An accurate parametrization of the mixing and entrainment can be a valuable input for ocean circulation models.
Sponsorship	Fluids Engineering Division
Starting Page	1283
Ending Page	1292
Page Count	10
File Format	PDF
ISBN	0791842894
DOI	10.1115/FEDSM2007-37673
e-ISBN	0791838056
Volume Number	Volume 2: Fora, Parts A and B
Conference Proceedings	ASME/JSME 2007 5th Joint Fluids Engineering Conference
Language	English
Publisher Date	2007-07-30
Publisher Place	San Diego, California, USA
Access Restriction	Subscribed
Subject Keyword	Climate Fluids Turbulence Oceans Simulation Dynamics (mechanics) Gravity (force) Engineering simulation Resolution (optics) Shear (mechanics) Density Flow (dynamics)
Content Type	Text
Resource Type	Article

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