Accession Number:

ADA464179

Title:

Roughness Spectra and Acoustic Response from a Diver-Manipulated Sea Floor

Descriptive Note:

Conference paper

Corporate Author:

NAVAL RESEARCH LAB STENNIS SPACE CENTER MS SEAFLOOR SCIENCES DIRECTORATE

Report Date:

2006-09-18

Pagination or Media Count:

7.0

Abstract:

A digital stereo photogrammetric system was designed and implemented to measure seafloor roughness in coastal sands. High-resolution images that achieve more than four pixelsmillimeter in either the horizontal or vertical dimension are created by two cameras sealed in watertight housings and actuated simultaneously by a scuba diver. A Digital Elevation Model DEM of the photographed sea floor is created from digital autocorrelation of left and right paired images. The DEM is used to estimate a two-dimensional roughness power spectrum from which parameters of the spectral exponent and spectral strength are derived that are used as inputs in high-frequency acoustic scattering models.

Subject Categories:

  • Cartography and Aerial Photography
  • Physical and Dynamic Oceanography
  • Photography
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE