Marine Geoscience Data System
NCShelf_Walsh Backscatter:Acoustic
Processed multibeam acoustic backscatter data (GeoTIFF grid format) of the North Carolina shelf post-Hurricane Florence (2019 survey)
Hurricane Florence made landfall as a Category 1 near Wilmington, NC on the morning of September 14, 2018. Hurricane-force winds were experienced over a large region, yielding powerful storm surge and waves over 8 m offshore. The overarching objective of the project was to collect seafloor mapping data and sediment samples over a previously surveyed portion of the Morehead City Ocean Dredged Material Disposal Site (ODMDS) to assess shelf sediment reworking associated with Hurricane Florence. The project collected geophysical data and sediment samples over a portion of the ODMDS offshore of Bogue Banks, NC in early 2019. Geodynamics LLC was contracted and collected a suite of multibeam bathymetry, backscatter and seismic reflection data along with sediment samples. These data sets add to previously collected information over the same area in 2013 and 2018. The multibeam bathymetry/backscatter data set was collected on January 15, 2019 aboard R/V Benthos with pole-mounted dual-head EM2040C-D sonars, an Applanix Pos MV inertial measurement unit and real-time kinetic GPS for positioning. Hypack software was used for navigation. The Kongsberg SIS 4.3.2 system was employed for multibeam data acquisition, and CARIS HIPS/SIPS was used for data processing. Backscatter intensity surfaces with a horizontal resolution of 1 m (3.28 feet) were generated in the Fledermaus FGMT software. The data file is in GeoTIFF grid format. Funding was provided by an NSF RAPID grant titled "RAPID: Examining Seafloor Dynamics offshore Bogue Banks, North Carolina, Related to Hurricane Florence", Award OCE 1906073 to lead investigator J.P. Walsh.
Device Info
Benthos (Boat)
Geodynamics LLC
The data have been processed/modified to a level beyond that of basic quality control (e.g. final processed sonar data, photo-mosaics).

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