Porosity effects on non-breaking surface waves over permeable submerged breakwaters
In: Coastal Engineering: An International Journal for Coastal, Harbour and Offshore Engineers. Elsevier: Amsterdam; Lausanne; New York; Oxford; Shannon; Tokyo. ISSN 0378-3839; e-ISSN 1872-7379, meer
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| Auteurs | | Top |
- Ting, C.-L.
- Lin, M.-C.
- Chen, C.-Y.
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| Abstract |
This study investigated how the porosity of submerged breakwaters affects non-breaking wave transformations. Eight modelgeometries each with six different porosities, from 0.421 to 0.912, were also considered. Experimental results reveal that themodel width has little effect on wave reflection and transmission when the model heights are fixed. The transmission coefficientis maximum at a kh in the range from 1.3 to 2.0 and minimum at a kh around 0.7. The wave reflection maximum is at kh of near0.5. The energy loss of the primary waves is maximum near kh = 0.81 and minimum when the porosity of the model is large.Porosity does affect wave transformation and its influence becomes significant as the heights of the models increase. For therange of porosities tested, wave energy loss from the primary harmonic was found to be almost constant at around 0.4 when kh>1.3, decreasing slowly when kh < 1.3; wave energy loss decreases for porosities above 0.75. |
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