Investigation of Ice Island Scouring on the Northern Continental Shelf of Alaska.

Ice Islands (Tabular Ice Bergs) which break off the Ice Shelf of Ellsmere Island have been known to ground on the northern coast of Alaska. This survey was conducted to investigate the bottom deformation (scour) occurring when such islands ground. The detailed survey used Side Scanning Sonar, Sub Bo...

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Bibliographic Details
Main Author: Skinner,Bruce C.
Other Authors: COAST GUARD ACADEMY NEW LONDON CONN
Format: Text
Language:English
Published: 1971
Subjects:
Physical and Dynamic Oceanography
Snow
Ice and Permafrost
*Ice islands
*Alaska
Sea ice
Offshore
Deformation
Ice reporting
Bathymetry
Icebreakers
Hydrographic surveying
Icebergs
Side looking sonar
Ellesmere Island
Coastal regions
Arctic regions
Continental shelves
Harrison Bay
Barter Island
*Ice scour
Arctic
Ice
Ice Shelf
Iceberg*
permafrost
Alaska
Online Access:http://www.dtic.mil/docs/citations/AD0786127
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0786127
Description
Summary:Ice Islands (Tabular Ice Bergs) which break off the Ice Shelf of Ellsmere Island have been known to ground on the northern coast of Alaska. This survey was conducted to investigate the bottom deformation (scour) occurring when such islands ground. The detailed survey used Side Scanning Sonar, Sub Bottom Profiling, and detailed bathymetry from a Coast Guard Icebreaker in water depths of 50' - 200' on the northern continental shelf of Alaska between 29 Jul and 3 August 1971. Approximately 120 miles of detailed tracks between Harrison Bay and Barter Island were surveyed. The Side Scan Sonar records complemented by the bathymetry and sub-bottom records revealed areas of extensive bottom scouring, believed to be due to grounded ice features; either ice islands or deep pressure ridges. (Modified author abstract)

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