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

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 int...

Full description

Bibliographic Details
Main Authors: Chakraborty, B., Schenke, H.W., Kodagali, V.N., Hagen, R.
Format: Article in Journal/Newspaper
Language:English
Published: Taylor & Francis 2002
Subjects:
seafloor mapping
roughness
echosounders
multibeam sonar
backscatter
Riiser-Larsen
Riiser-Larsen Sea
Online Access:http://drs.nio.org/drs/handle/2264/1448
Description
Summary: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.

Similar Items