Flare imaging with multibeam sonar systems: data processing for seep bubble detection.

Schneider von Deimling, Jens, Brockhoff, J. and Greinert, Jens (2007) Flare imaging with multibeam sonar systems: data processing for seep bubble detection. Open Access Geochemistry, Geophysics, Geosystems, 8 (6). Q06004. DOI 10.1029/2007GC001577.

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Multibeam sonar surveys have been conducted since their invention in the 1970s; however, mainly reflections from the seafloor were considered so far. More recently, water column imaging with multibeam is becoming of increasing interest for fisheries, buoy, mooring, or gas detection in the water column. Using ELAC SEABEAM 1000 data, we propose a technique to detect gas bubbles (flares) although this system is originally not designed to record water column data. The described data processing represents a case study
and can be easily adapted to other multibeam systems. Multibeam data sets from the Black Sea and the North Sea show reflections of gas bubbles that form flares in the water column. At least for reasonably intense gas escape the detection of bubbles is feasible. The multibeam technique yields exact determination of the source position and information about the dimension of the gas cloud in the water. Compared to conventional flare imaging by single-beam echo sounders, the wide swath angle of multibeam systems allows the mapping of large areas in much shorter time.

Document Type: Article
Keywords: Multibeam, sonar, flare imaging, bubbles, acoustic data processing, methane seeps; gas and hydrate systems, Ocean acoustics; bathymetric interactions
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2007GC001577
ISSN: 1525-2027
Projects: Future Ocean, COMET, GEOTECHNOLOGIEN
Date Deposited: 03 Dec 2008 16:51
Last Modified: 07 Nov 2017 09:17
URI: http://oceanrep.geomar.de/id/eprint/2987

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