SOME HYDRODYNAMIC PROBLEMS FOR A NEPHELOID ZONE.

A layer of a few hundred meters' thickness with suspended matter near the bottom on the continental slope of the North Atlantic (a nepheloid zone) discovered by Ewing and Thorndike seems to produce bottom currents, because heavier water near the bottom due to suspended matter slides down the sl...

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Bibliographic Details
Main Author: Ichiye,Takashi
Other Authors: LAMONT GEOLOGICAL OBSERVATORY PALISADES N Y
Format: Text
Language:English
Published: 1964
Subjects:
(*OCEAN CURRENTS
OCEAN BOTTOM)
(*ATLANTIC OCEAN
MARINE GEOPHYSICS)
CORIOLIS EFFECT
HYDRODYNAMICS
SEA WATER
DENSITY
VISCOSITY
GRAVITY
MATHEMATICAL ANALYSIS
NEPHELOID ZONE
Ewing
North Atlantic
Online Access:http://www.dtic.mil/docs/citations/AD0610047
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0610047
Description
Summary:A layer of a few hundred meters' thickness with suspended matter near the bottom on the continental slope of the North Atlantic (a nepheloid zone) discovered by Ewing and Thorndike seems to produce bottom currents, because heavier water near the bottom due to suspended matter slides down the slope. When only the Coriolis' force balances with this gravity effect, the bottom current flows southwestwards along the slope with the maximum velocity of about 10 (cm/sec) for a slope of one degree. The effect of gravity on a fluid in hydrostatic equilibrium with locally variable density above the sloping bottom is discussed and the extra term due to the density gradient along the slope is derived. The vertical profiles of the currents are determined when the vertical eddy viscosity works beside the Coriolis' force. Two kinds of eddy viscosity distributions estimated from the observed nepheloid distributions are used. The inertia terms were found to be more important to turbidity currents than Coriolis' force. (Author)

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