Shear Stress Measurements and Erosion Implications for Wave and Combined Wave-Current Generated Flows
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 138, Issue 4
Abstract
Sediment transport in wave-dominated environments is of great interest for dredged material placement, contaminated sediments, habitat protection, and other issues. The shear stress at the sediment-water interface during a wave event is an important parameter in determining erosion and transport for both experimental and model simulation applications. Sandia National Laboratories has developed a laboratory and field device called the sediment erosion actuated by wave oscillations and linear flow (SEAWOLF) flume in which high-resolution, particle-image velocimetry (PIV) has been applied to investigate turbulent flow shear stresses for a variety of flow conditions. The results of the PIV analysis for a wave cycle demonstrate a fully developed turbulent flow, relaminarization, and an explosive transition back to turbulence. In many cases, the results of the flume tests did not show good agreement with previously reported computational fluid dynamic results and existing theories, such as Blasius, for wave-current interactions, which raises the question of whether similar phenomena are present in real environments. These results implore more studies to be conducted with similarly high-resolution field measurements and modeling efforts to determine shear stress time history for oscillatory flows and the subsequent effects on erosion and sediment transport in wave-dominated environments.
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Acknowledgments
The writers thank Janet Barco for her technical review of the text and editing of the figures for the final manuscript. This work was funded by the Strategic Environmental Research and Development Program (SERDP) and the Environmental Security Technology Certification Program (ESTCP). SERDP is the Department of Defense’s (DoD) environmental science and technology program, planned and executed in full partnership with the Department of Energy and the Environmental Protection Agency, with participation by numerous other federal and nonfederal organizations. ESTCP is a DoD program that promotes innovative, cost-effective environmental technologies through demonstration and validation at DoD sites. This work was conducted at Sandia National Laboratories. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed-Martin Company, for the United States Department of Energy’s National Nuclear Security Administration under Contract DE-AC04-94AL85000.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 138 • Issue 4 • July 2012
Pages: 323 - 329
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Mar 12, 2010
Accepted: Oct 28, 2011
Published online: Nov 3, 2011
Published in print: Jul 1, 2012
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