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Title2004 Grand Banks iceberg scour survey
AuthorSonnichsen, G V; King, T
SourceProceedings of the 21st International Conference on Port and Ocean Engineering under Arctic Conditions; 2011 p. 1-10
Alt SeriesEarth Sciences Sector, Contribution Series 20110137
MeetingPort and Offshore Engineering under Arctic Conditions (POAC) Conference; Montreal; CA; July 10-14, 2011
ProvinceEastern offshore region
AreaGrand Banks
Lat/Long WENS-49.0000 -48.0000 47.0000 46.2500
Subjectsmarine geology; geophysics; bathymetry; seafloor topography; seabottom topography; ice scours; scouring; scour marks; side-scan sonar; mapping techniques; oceanography; oceanographic surveys
Illustrationslocation maps; tables; graphs; images
ProgramOffshore Geoscience Geoscience East Coast
Released2011 01 01
AbstractIn June of 2004, a multibeam sonar survey was conducted on northeast Grand Bank over a previously established repetitive mapping site to identify new seabed scours and improve the scour rate estimate for the region. Post-survey analysis of the resulting multibeam data identified one scour event classified as new with a high degree of certainty, and nine other scour events that may be new, but having a lower degree of confidence. Uncertainty in the identification of new scours was primarily due to limitations in the quality of the sidescan data collected during earlier baseline surveys. This paper describes the scour dataset collected during the survey, including distributions of relevant scour metrics (i.e. width, depth), and the procedure used to evaluate the repetitive mapping data and resulting distribution of possible scour formation rates.

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