Chapter
Apr 26, 2012
Techniques and Measurements for Flows and Water Levels in a Large Northern Delta
Authors: Peter Ward, Hassen Yassien, and Stephen J. BurgesAuthor Affiliations
Publication: Critical Transitions in Water and Environmental Resources Management
Abstract
Field work on the Athabasca part of the Peace Athabasca Delta, in Northern Canada, has shown the usefulness of employing new equipment to understand channel hydraulics in remote areas. A differential GPS system was used for accurate surveying work, and an Acoustic Doppler Profiler (ADP) was used to determine flow rates. Channel bank heights for an 81km distance upstream from Lake Athabasca were determined, as were river surface levels at medium discharge in the Athabasca River and its distributary channels. As many as 15 channel sections were surveyed per day with a boat-mounted ADP. For the same daily discharge value, cross-sectional average velocities in the main channel were found to be preserved at about the same value for a remarkably long distance in the final part of the delta, all the way to the lake. Comparison with old data shows a remarkably rapid rate of channel building. Flood magnitudes that cause bankfull flow conditions were found to change by a large factor from the head of the delta to the lake.
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© 2004 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Peter Ward
Ward & Associates Hydrology Engineers, 200-1311 Howe Street, Vancouver, B.C. Canada
Hassen Yassien
Ward & Associates Hydrology Engineers, 200-1311 Howe Street, Vancouver, B.C. Canada
Stephen J. Burges
Department of Civil and Environmental Engineering, University of Washington, Seattle, Washington
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