Roughness Spectra and Acoustic Response from a Diver-Manipulated Sea Floor
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 pixels/millimeter 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 18, 2006
- Accession Number
- ADA464179
Entities
People
- Anthony P. Lyons
- Kevin B. Briggs
- Kevin L. Williams
- Michael D. Richardson
Organizations
- United States Naval Research Laboratory