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Estimating deep seafloor interface and volume roughness parameters using the multibeam-hydrosweep system

DRS at CSIR-National Institute of Oceanography

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Title Estimating deep seafloor interface and volume roughness parameters using the multibeam-hydrosweep system
 
Creator Chakraborty, B.
Schenke, H.W.
Kodagali, V.N.
Hagen, R.
 
Subject seafloor mapping
roughness
echosounders
multibeam sonar
backscatter
 
Description Utilizing a hull-mounted, multinarrow beam echosounder onboard RV Polarstern, variation of acoustic backscatter with incidence angles at two different sites in the Southern Oceans (Agulhas Plateau and the Riiser Larsen Sea) is measured. Using a composite roughness model, including water-sediment interface roughness and sediment volume roughness parameters the data was modeled. The model effectively uses the near normal incidence angle backscatter to determine the seafloor interface roughness parameters employing Helmholtz-Kirchhoff theory. Beyond 20 degrees incidence angles, an application of Rayleigh-Rice theory is made by using a necessary splicing technique (combining both of the theories at 20 degrees incidence angle).The estimated interface and volume roughness parameters are found to be in accordance with the known area geology.
 
Date 2008-08-11T12:29:07Z
2008-08-11T12:29:07Z
2002
 
Type Journal Article
 
Identifier Marine Geodesy, Vol. 25(1-2); 19-26p.
http://drs.nio.org/drs/handle/2264/1448
 
Language en
 
Rights Taylor and Francis
 
Publisher Taylor & Francis