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Comparision of Overtopping Performance and Prediction Models for Rubble Mound Breakwaters Armoured Tetrapod  

Kim, In-Chul (Division of Architecture and Civil Engineering, Dongseo University)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.22, no.6, 2010 , pp. 397-404 More about this Journal
Abstract
Laboratory tests of wave overtopping rates for a rubble mound breakwaters armoured Tetrapod were carried out, with varying design waves, crest berm widths and crest freeboards. The objective of this study is to investigate overtopping performance and to examine the characteristics of the widely used overtopping prediction models through the results of laboratory tests. Laboratory tests show that structure slope and wave periods have a considerable influence on overtopping rates, but the difference of overtopping rates related to crest berm widths is slight. Owen(1980)'s prediction considerably overestimates compared to the measured valued. Prediction of Van der Meer et al.(1998) underestimates only for steep slope($cot{\alpha}$=1.5). Besley(1999)'s and Pedersen(1996)'s predictions have a relatively good agreement with the measured results for slopes with a broader crest berm width. In general, best agreement between measured and predicted overtopping rates is observed using modified Pedersen(1996)'s formula for all test conditions.
Keywords
tetrapod; rubble mound breakwater; laboratory test; overtopping performance; overtopping rates prediction mode;
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