FN Archimer Export Format
PT J
TI Quantitative characterisation of seafloor substrate and bedforms using advanced processing of multibeam backscatter-Application to Cook Strait, New Zealand
BT 
AF LAMARCHE, Geoffroy
   LURTON, Xavier
   VERDIER, Anne-Laure
   AUGUSTIN, Jean-Marie
AS 1:1;2:2;3:1;4:2;
FF 1:;2:PDG-IMN-NSE-AS;3:;4:PDG-IMN-NSE-AS;
C1 Natl Inst Water & Atmospher Res NIWA Ltd, Wellington 6241, New Zealand.
   IFREMER, F-29280 Plouzane, France.
C2 NIWA, NEW ZEALAND
   IFREMER, FRANCE
SI BREST
SE PDG-IMN-NSE-AS
IN WOS Ifremer jusqu'en 2018
   copubli-int-hors-europe
IF 2.088
TC 111
UR https://archimer.ifremer.fr/doc/00031/14260/11552.pdf
LA English
DT Article
DE ;Backscatter;Multibeam echo-sounder;Sediment waves;Habitat mapping
AB 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. Sediment samples and high-resolution seismic data are used for ground-truthing. SonarScope (R) software is used to process the data, including signal corrections from sensor bias, specular reflection compensation and speckle noise filtering aiming at attenuating the effects of recording equipment, seafloor topography, and water column. The processing is completed by correlating a quantitative description (the Generic Seafloor Acoustic Backscatter-GSAB model) with the backscatter data. The calibrated Backscattering Strength (BS) is used to provide information on the physical characteristics of the seafloor. The imagery obtained from the BS statistical compensation is used for qualitative interpretation only; it helps characterizing sediment facies variations as well as geological and topographic features such as sediment waves and erosional bedforms, otherwise not recognised with the same level of detail using conventional surveying. The physical BS angular response is a good indicator of the sediment grain size and provides a first-order interpretation of the substrate composition. BS angular response for eight reference areas in the Narrows Basin are selected and parameterised using the GSAB model, and BS angular profiles for gravelly, sandy, and muddy seafloors are used as references for inferring the grain size in the reference areas. We propose to use the calibrated BS at 45 degrees incidence angle (BS45) and the Specular-To-Oblique Contrast (STOC) as main global descriptors of the seafloor type. These two parameters enable global backscatter studies by opposition to compensated imagery whose intensity is not comparable from one zone to the other. The results obtained highlight the interest of BS measurements for seafloor remote sensing in a context of habitat-mapping applications. (C) 2010 Elsevier Ltd. All rights reserved.
PY 2011
PD FEB
SO Continental Shelf Research
SN 0278-4343
PU Pergamon-elsevier Science Ltd
VL 31
IS 2
UT 000287991900009
DI 10.1016/j.csr.2010.06.001
ID 14260
ER

EF