Optical Measurements of Tsunami Inundation and Debris Movement in a Large-Scale Wave Basin
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 141, Issue 1
Abstract
This paper presents optical measurements of debris movement and tsunami inundation over an unobstructed beach in a laboratory wave basin. The debris consisted of rectangular boxes and was placed unconstrained on a flat section raised above the basin floor with no still water on the raised section. Debris movement was measured using two overhead video cameras and a novel object-tracking algorithm. Two standard optical techniques, wave edge detection and particle image velocimetry, were used to compare optical and in situ measurements of fluid velocity. The debris motion (position, velocity) in the onshore direction was found to be repeatable, but the offshore motion varied between trials because of the irregular nature of the flow field during the return. For debris in free translation, as the number of debris specimens increased, the peak average velocity decreased and the onset of the peak was delayed in the onshore direction. In the offshore direction, the velocity was lower by a factor 4–6 and was independent of the quantity of debris. The decrease in the peak onshore velocity with increasing amount of debris was observed for debris that undergoes an initial rotation. The peak onshore velocity was nearly independent of whether the initial motion was purely translational or a combination of rotation and translation.
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Acknowledgments
Support for this research by Oregon Sea Grant and the National Science Foundation under No. CMMI-0830378 is gratefully acknowledged. The Tsunami Facility is supported by the Network for Earthquake Engineering Simulation (NEES) Program of the National Science Foundation under award No. CMMI-0402490. The authors gratefully acknowledge the work of the staff of the O. H. Hinsdale Wave Research Laboratory and several other undergraduate student workers (Kyle Mayfield, Jose Lozano, and Brittany Snyder) in conducting the physical model experiments. The authors thank the two anonymous reviewers for their comments to improve the manuscript.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 141 • Issue 1 • January 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 28, 2013
Accepted: Apr 8, 2014
Published online: May 29, 2014
Published in print: Jan 1, 2015
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