Accession Number : AD0610047

Title :   SOME HYDRODYNAMIC PROBLEMS FOR A NEPHELOID ZONE.

Descriptive Note : Technical rept.,

Corporate Author : LAMONT GEOLOGICAL OBSERVATORY PALISADES N Y

Personal Author(s) : Ichiye,Takashi

Report Date : DEC 1964

Pagination or Media Count : 29

Abstract : 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)

Descriptors :   (*OCEAN CURRENTS, OCEAN BOTTOM), (*ATLANTIC OCEAN, MARINE GEOPHYSICS), CORIOLIS EFFECT, HYDRODYNAMICS, SEA WATER, DENSITY, VISCOSITY, GRAVITY, MATHEMATICAL ANALYSIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE