THE NORMALLY-INCIDENT REFLECTIVITY OF THE SEA FLOOR AT 12 KC AND ITS CORRELATION WITH PHYSICAL AND GEOLOGICAL PROPERTIES OF NATURALLY-OCCURRING SEDIMENTS.

The objective of this investigation was to measure bottom loss in normal incident reflection of pulses of 12 kcps sound and to study its geological significance. A semi-automatic instrument system was developed capable of making continuous measurements of the peak pressure and the time integral of t...

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Bibliographic Details
Main Author: Breslau,Lloyd R.
Other Authors: WOODS HOLE OCEANOGRAPHIC INSTITUTION MASS
Format: Text
Language:English
Published: 1967
Subjects:
Physical and Dynamic Oceanography
Geology
Geochemistry and Mineralogy
(*OCEANOGRAPHIC DATA
*SEDIMENTATION)
(*ACOUSTICS
MEASUREMENT)
PHYSICAL PROPERTIES
UNDERWATER PHOTOGRAPHY
PARTICLE SIZE
SAND
SILT
CLAY
BATHYTHERMOGRAPH DATA
POROSITY
GRAVEL
TABLES(DATA)
SHALLOW WATER
OCEAN BOTTOM
DEEP WATER
REFLECTIVITY
SAMPLING
ATLANTIC OCEAN
Most Project-2
North Atlantic
Online Access:http://www.dtic.mil/docs/citations/AD0655245
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0655245
Description
Summary:The objective of this investigation was to measure bottom loss in normal incident reflection of pulses of 12 kcps sound and to study its geological significance. A semi-automatic instrument system was developed capable of making continuous measurements of the peak pressure and the time integral of the square of the pressure of the sea-floor echo from a vessel underway. Observations were taken in both deep and shallow water in the Western North Atlantic. The early cruises were conducted in deep water to investigate the range and variability of bottom loss. Geological control consisted mainly of a precise bathymetric record. Later cruises were conducted in shallow water where the geology had been well studied previously. In these latter cruises the acoustic measurements were correlated with sediment dredging and underwater photography. Thirty-one thousand acoustic measurements were made. Median bottom loss values and standard deviations were computed and the results summarized in eleven hundred sets, each set corresponding with a location at sea. Seventy-seven sediment stations were occupied. A complete particle size analysis and a water content analysis were performed on these sediments to determine their size and mass characteristics. (Author)

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