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- Title
Distribution and morphology of inner-shelf sand bodies off southwest Newfoundland based on merged multibeam sonar and LiDAR data.
- Authors
Shaw, John; Wu, Yongsheng; Potter, D. Patrick
- Abstract
The inner shelf off southwest Newfoundland, bordering the Laurentian Channel, was mapped with multi-beam sonar between depths of 200 and ∼20 m, overlapping with coverage by marine/terrestrial LiDAR from maximum depths of 30 m to above sea level. The new data provide the first clear view of linkages between terrestrial and nearshore coastal systems and the inner shelf. Offshore sand reservoirs associated with adjacent sandy coastal barriers and spits are thin (∼2 m), and isolated from one another, so that bedrock is the dominant seafloor terrain on the inner most shelf. The offshore sand reservoirs link with complex nearshore bar systems, from which it is inferred that sediment exchange with terrestrial systems can occur. Several isolated sand bodies are interpreted as residuals from former coastal systems destroyed during the Holocene transgression. The new data reveal the unexpected existence of a submarine canyon that facilitates transport of sediment from the inner shelf into the deep glacial trough of the Laurentian Channel.
- Subjects
NEWFOUNDLAND &; Labrador; SUBMARINE valleys; LIDAR; SAND; SONAR; SAND waves; SEDIMENT transport; SUBMARINE topography
- Publication
Canadian Journal of Earth Sciences, 2020, Vol 57, Issue 1, p114
- ISSN
0008-4077
- Publication type
Article
- DOI
10.1139/cjes-2018-0311