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TitleCorrelating high-resolution multibeam sonar backscatter with benthic sediment grain-size distributions to aid numerical modeling in the Mississippi Bight
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AuthorQuas, L; Church, I; O'Brien, S J; Wiggert, J D
SourceProgram and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada; by Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; Geological Survey of Canada, Open File 8295, 2017 p. 98, https://doi.org/10.4095/305916 (Open Access)
LinksGeoHab 2017
Year2017
PublisherNatural Resources Canada
Meeting2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; May 1-4, 2017
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; (2017). Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada, Geological Survey of Canada, Open File 8295
File formatpdf
AreaGulf of Mexico; Mississippi Bight; United States
Lat/Long WENS -89.5000 -85.0000 30.5000 29.0000
Subjectsmarine geology; surficial geology/geomorphology; environmental geology; geophysics; fossil fuels; geochemistry; mapping techniques; oceanography; marine environments; coastal studies; conservation; marine organisms; marine ecology; resource management; biological communities; environmental studies; ecosystems; marine sediments; grain size distribution; benthos; geophysical surveys; acoustic surveys, marine; sonar surveys; side-scan sonar; modelling; bathymetry; seafloor topography; oil spills; biogeochemistry; sediment transport; sediment suspension; marine sediment cores; grain size analysis; geological mapping; geological mapping techniques; biology; habitat mapping; habitat conservation; habitat management; demersal species
ProgramOcean Management Geoscience, Offshore Geoscience
Released2017 09 26
AbstractMultibeam acoustic backscatter intensity data can serve as a proxy for the composition and distribution of surficial seabed sediments, but without calibration and realistic seabed models there can be uncertainty in the analysis. Mosaics of the acoustic response of the seabed normalized to a fixed grazing angle provide an indication of spatial variations in seabed scattering and, therefore, an estimate of general grain-size distributions. These characteristics, along with multibeam bathymetry and sediment ground truth, can be used to inform numerical model development, like the high resolution biogeochemical/lower trophic level synthesis model being developed as part of the Gulf of Mexico Research Initiative's (GoMRI) CONsortium for oil spill exposure pathways in COastal River-Dominated Ecosystems (CONCORDE) project.
One of the necessary model inputs is bottom sediment characterization that influences local sediment transport and resuspension. To obtain this input parameter, a Teledyne Reson SeaBat 7125 SV2 multibeam sonar was operated to collect seafloor acoustic backscatter data. Surficial sediment cores and grain-size analyses were performed at select locations along the CONCORDE observational corridors to constrain the backscatter data, produce acoustically- derived sediment distribution maps, and provide sediment type input parameters for the biogeochemical model. The numerical model simulations are used to assess sediment transport in the river-dominated, coastal environment of the Mississippi Bight region on hourly to daily timescales. The sediment distribution corridor maps developed as part of this project will further our understanding of the benthic and demersal ecosystems within the Mississippi Bight.
GEOSCAN ID305916