Accession Number : AD0718132

Title :   A Study of the Sediments Within Submarine Gullies Off Del Mar, California, with Emphasis on Their Mass Physical Properties.

Descriptive Note : Final rept. 1969-1970,

Corporate Author : LOCKHEED MISSILES AND SPACE CO SUNNYVALE CALIF LOCKHEED OCEAN LAB

Personal Author(s) : Simpson,F. ; Inderbitzen,A. L.

Report Date : DEC 1970

Pagination or Media Count : 100

Abstract : A precise bathymetric survey including the collection of 21 cores was accomplished by the submersible DEEP QUEST along a gullied section of the upper San Diego Trough slope off Del Mar, California. The purpose of the study was to investigate the relationship between topography and the mass physical properties of marine sediments as well as to gain information on the stability of underwater slopes and lateral variability of sediment properties. The cores were obtained along precisely controlled transects down the gully axes as well as on transects approximately perpendicular to the axes. Sediment samples from the cores were tested in the laboratory for shear strength, water content, bulk density, grain size distribution and mineralogic composition. Grain size distribution appears to be the only property directly related to topography. As expected, within the submarine gullies, grain size decreases downslope in a seaward direction. Water content of the sediment increases as the grain size decreases. (Author)

Descriptors :   (*OCEAN BOTTOM SAMPLING, SEDIMENTATION), (*OCEAN BOTTOM TOPOGRAPHY, CORRELATION TECHNIQUES), BATHYTHERMOGRAPH DATA, UNDERWATER VEHICLES, MINERALS, PARTICLE SIZE, STABILITY, SHEAR STRESSES, DENSITY, CALIFORNIA

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE