| Title | Grand Banks Scour Catalogue (GBSC) GeoDatabase |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Campbell, P; Burke, E; Sonnichsen, G V |
| Source | Geological Survey of Canada, Open File 7420, 2014, 82 pages, https://doi.org/10.4095/293618  Open Access |
| Links | Erratum
|
| Year | 2014 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is superceded by Grand Banks Scour
Catalogue (GBSC) GeoDatabase |
| File format | readme
|
| File format | pdf; rtf; pmf (ArcReader v9.3 (TM) is included / est fourni) |
| Province | Eastern offshore region |
| Area | Grand Banks |
| Lat/Long WENS | -49.0000 -48.0000 47.0000 46.2500 |
| Subjects | marine geology; geophysics; bathymetry; seafloor topography; seabottom topography; ice scours; scouring; scour marks; side-scan sonar; mapping techniques; oceanography; oceanographic surveys; submarine
features; submarine transport; icebergs; iceberg gouging; data base management systems; data collections |
| Illustrations | location maps; tables; graphs; images; histograms |
| Program | Offshore Geoscience |
| Released | 2014 02 18 |
| Abstract | In the late 1990's and early 2000's, NRCan, through the Geological Survey of Canada (GSC), conducted research on the distribution and severity of seabed iceberg scour on the Grand Banks. One of the key
products of that work was a research database that recorded the location and geometric parameters for all mapped seabed scours on the Grand Banks. The Grand Banks Scour Database (GBSC) was developed under GSC contract to Canadian Seabed Research Ltd.
(CSR) and updated sporadically when funding allowed new data to be captured. With the wind-down of GSC work on Grand Bank seabed scour, it is important to formalize the database and release a standardized database in a documented and publicly
accessible format. This report documents the development of a simplified GIS Geodatabase that represents the key scour parameters. The scours recorded in the GBSC were identified and measured from various geophysical data sets including; sidescan
sonar, multibeam sonar, sub-bottom profiler, single beam echo sounder, and high resolution single channel seismic (Huntec) systems. The GBSC survey coverage consists of an irregular network of regional lines (22,704 km) and site surveys (4762 km2)
conducted by the GSCA and the petroleum industry. The simplified GBSC Geodatabase compiled during this study contains 5366 iceberg furrow features and 2680 iceberg pit features. The interaction of ice and seafloor sediments may result in a variety
of ice scour types and shapes. Features stored in the GBSC include furrows, furrows with an associated pit (s), individual pits and Pit Chains. Iceberg furrows and pits have been recorded in water depths ranging from 49 to 350 m and within sediment
types of Predominantly Sand, Sand & Gravel, and Gravel. Although a significant number of furrows occur within each 10° orientation bin the general orientation mode of the GBSC furrow population is northeast - southwest. Furrow length ranges from 5 m
to 10,216 m, with a mean length of 584.7 m while Pit area ranges from 84 m² to 111,300 m², with a mean area of 6193 m². Furrow width measurements range from 1 to 208 m with a mean width of 26 m. Furrow depth ranges from 0.1 m to 7.0 m, with a mean
depth of 0.88 m while Pit depth ranges from 0.1 m to 8.3 m, with a mean of 1.92 m. |
| Summary | (Plain Language Summary, not published)
In the 1990's and early 2000¿s, the Geological Survey of Canada (GSC), studied the distribution and severity of seabed iceberg scour on Grand Bank. A key
product was a research database that recorded the location and geometric parameters for all mapped seabed scours. The Grand Bank Scour Database (GBSC) was developed under contract and updated sporadically when funding allowed new data to be captured.
With wind-down of GSC work on Grand Bank seabed scour, it is important to formalize the database and release a standardized database in a documented and publicly accessible format. This Open File report includes a simplified, documented GIS
Geodatabase that represents the key scour parameters. GBSC survey coverage consists of an irregular network of regional lines (22,704 km) and site surveys (4762 km2) conducted by GSC and the petroleum industry. GBSC scours were mapped from seabed
mapping instruments such as sidescan sonar, subbottom profiler and multibeam sonar. The GBSC Geodatabase contains 5366 iceberg furrows and 2680 iceberg pits. |
| GEOSCAN ID | 293618 |
|
|