Journal ArticleDOI
Application of the composite roughness model to high‐frequency bottom backscattering
TLDR
In this paper, the composite roughness model is applied to bottom backscattering in the frequency range 10-100 kHz and the Kirchhoff approximation is used to obtain better results.Abstract:
The composite roughness model is applied to bottom backscattering in the frequency range 10–100 kHz. For angles near normal incidence, the composite roughness model is replaced by the Kirchhoff approximation which gives better results. In addition, sediment volume scattering is treated, with account taken of refraction and reflection at the randomly sloping interface. In applying the model to published data it is found that sediment volume scattering is dominant in soft sediments except at small and large grazing angles. For coarse sand bottoms, roughness scattering dominates over a wide range of grazing angles. Implications for acoustic remote sensing are discussed.read more
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Journal ArticleDOI
Seabed characterization on the New Jersey middle and outer shelf: correlatability and spatial variability of seafloor sediment properties
John A. Goff,Barbara J. Kraft,Larry A. Mayer,Steven G. Schock,Christopher K. Sommerfield,Hilary Clement Olson,Sean P. S. Gulick,S. Nordfjord +7 more
TL;DR: In this article, nearly 100 collocated grab samples and in situ 65 kHz acoustic measurements were collected on the New Jersey middle and outer shelf within an area that had previously been mapped with multibeam backscatter and bathymetry data, and more recently with chirp seismic reflection profiling.
Journal ArticleDOI
Angular range analysis of acoustic themes from Stanton Banks Ireland: A link between visual interpretation and multibeam echosounder angular signatures
TL;DR: In this article, an approach to combine mosaicking and angular response analysis techniques in an attempt to take advantage of both the spatial resolution of the mosaic, and the angular resolution derived from the angular response was proposed.
Journal ArticleDOI
Quantitative characterisation of seafloor substrate and bedforms using advanced processing of multibeam backscatter—Application to Cook Strait, New Zealand
TL;DR: In this article, a comprehensive EM300 multibeam echo-sounder dataset acquired from Cook Strait, New Zealand, is used to develop a regional-scale objective characterisation of the seafloor.
Journal ArticleDOI
Correlation of side-scan backscatter intensity with grain-size distribution of shelf sediments, New Jersey margin
TL;DR: In this paper, the dependence of acoustic backscatter variations on sediment grain-size distribution was examined using a combined analysis of 95 kHz side-scan data and approx. 300 grab samples from the New Jersey margin.
Journal ArticleDOI
Angular dependence of 12‐kHz seafloor acoustic backscatter
C. de Moustier,D. Alexandrou +1 more
TL;DR: In this paper, the angular dependence of seafloor acoustic backscatter, measured with a 12 kHz multi narrow-beam echo-sounder at two sites in the central North Pacific with water depths of 1500 and 3100 m, respectively, has been determined for incidence angles between 0° and 20°.