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

Author

Briggs, Kevin B. ; Richardson, Michael D. ; Williams, Kevin L. ; Lyons, Anthony P.

Author_Institution

Naval Res. Lab., Stennis Space Center, MS

fYear

2006

fDate

18-21 Sept. 2006

Firstpage

1

Lastpage

5

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/mm 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 2D roughness power spectrum, from which are derived parameters of the spectral exponent and spectral strength that are used as inputs in high-frequency acoustic scattering models

Keywords

digital elevation models; oceanographic techniques; photogrammetry; sand; sediments; underwater sound; 2D roughness power spectrum; DEM; Digital Elevation Model; cameras; coastal sands; digital autocorrelation; digital stereo photogrammetric system; diver-manipulated sea floor; high-frequency acoustic scattering models; high-resolution images; scuba diver; spectral exponent; spectral strength; watertight housings; Acoustic scattering; Cameras; Laboratories; Lenses; Sea floor; Sea floor roughness; Sea measurements; Sea surface; Surface acoustic waves; Surface morphology;

fLanguage

English

Publisher

ieee

Conference_Titel

OCEANS 2006

Conference_Location

Boston, MA

Print_ISBN

1-4244-0114-3

Electronic_ISBN

1-4244-0115-1

Type

conf

DOI

10.1109/OCEANS.2006.307009

Filename

4098846