Video Measurements of Large-Scale Flows in a Laboratory Wave Basin
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Volume 134, Issue 1
Abstract
This paper describes nonintrusive optical techniques to measure large-scale flows in a laboratory wave basin. Numerous drifters with weak positive flotation are tracked discretely and automatically using a video camera mounted near the laboratory ceiling. Processed drifter tracks are used for dense estimates of mean surface currents over the visible area. Examination of the drifter tracks also shows that waves are imaged and therefore basic wave properties may also be estimated, although this requires some further assumptions. These video based flow observations are presumed to have less precision than in situ measurements; however, the density of measurements from the video far exceeds that which can be obtained using fixed instruments, providing the method’s major advantage.
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Acknowledgments
This work was supported by the National Oceanographic Partnership Program under Grant No. N00014-99-1-105, the U.S. Geospatial-Intelligence Agency and by Florida Sea Grant. Their support is gratefully acknowledged. The writers would also like to thank the Center for Applied Coastal Research at the University of Delaware for use of their wave basin and Amal Phadke for his assistance with WAMIT.
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Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 134 • Issue 1 • January 2008
Pages: 12 - 20
Copyright
© 2008 ASCE.
History
Received: Feb 22, 2006
Accepted: Jun 21, 2006
Published online: Jan 1, 2008
Published in print: Jan 2008
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