Wave-Induced Drift of Large Floating Objects in Regular Waves
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 139, Issue 6
Abstract
The current study experimentally investigates the wave-induced drift velocity of two-dimensional large floating objects (with , where = longitudinal length of the floating objects, and = wavelength) under the action of regular waves. The focus is on the high-precision measurement of drift behavior and a wider range of parameters than what was previously reported in the literature. Stacked wood pieces with various submergences () were used to simulate the large floating objects on the water surface. An infrared-based motion monitoring system with two high-resolution cameras continuously recorded their motion in regular waves. The results show that the drift velocity increased quickly from the beginning and reached a quasi-steady mean value. The magnitude of the quasi-steady drift velocity increased with ratio of the pitch period to the wave period (), until reaching a maximum when . After that, further increasing the ratio of did not lead to additional significant changes in the drift velocity. Three nondimensional submergences () of 0.0075, 0.022, and 0.036 were examined. The drift velocity typically decreased with larger submergence, which can be attributed to the larger added mass involved in the oscillatory motion.
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Acknowledgments
The work was supported by the Ministry of Education, Singapore, through the AcRF Tier 2 Grant No. MOE2008-T2-070, and was partially supported by the State Key Laboratory of Coastal and Offshore Engineering Research Foundation, China, through Grant No. SL2012-2. The authors thank the anonymous reviewers for their valuable comments, which improved the quality of this manuscript.
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© 2013 American Society of Civil Engineers.
History
Received: Aug 8, 2012
Accepted: May 2, 2013
Published online: May 4, 2013
Published in print: Nov 1, 2013
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