Accession Number:

ADA626070

Title:

Observations Regarding Sediment Type and Compressional-Wave Velocity

Descriptive Note:

Annual rept.

Corporate Author:

NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV

Personal Author(s):

Report Date:

2001-09-30

Pagination or Media Count:

5.0

Abstract:

The long-term goal is to enable realistic geoacoustic modeling given limited sediment properties information. The purpose of this research is to examine ODP sonic logs to determine if there are indeed consistent relationships between compressional-wave velocity Vp and certain sediment types. Geoacoustic models Hamilton,1980 are widely used in the acoustical and geophysical communities to predict acoustic behavior in the upper several hundred meters of the sea floor. The basis for these models are regression equations that provide expected values for various sediment geoacoustic properties as they change with depth below the sea floor. A key element of geoacoustic models is the change in sound velocity with depth. Hamilton 1980 derived velocity depth functions for three sediment types siliceous - S, terrigenous - T, and calcareous - C based on empirical fits to field measurements sonobouy data. The curves imply a correlation between sediment type and velocity to the extent that one can reasonably predict acoustic behavior in most ocean areas.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Geology, Geochemistry and Mineralogy
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE