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

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4 Author(s)
Briggs, K.B. ; Naval Res. Lab., Stennis Space Center, MS ; Richardson, M.D. ; Williams, K.L. ; Lyons, A.P.

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

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18-21 Sept. 2006