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Numerical model of wave effects on permeable vertical barriers above the seabed

University of British Columbia

This thesis describes a numerical model used to predict the interaction of a regular small amplitude wave train with a thin permeable vertical barrier extending from the water surface to some distance above the seabed. The case of wave interactions with a pair of such barriers is also treated. The approach used is based on an eigenfunction expansion method and utilizes a boundary condition at the barrier surface which accounts for energy dissipation within the barrier. Comparisons of results based on the method have been carried out with those of previous numerical studies for related situations, and close agreement has been obtained in all such cases. A selection of results based on the method are presented for the transmission, reflection, and energy dissipation coefficients, the wave runup, and the maximum horizontal force on the barrier. These exhibit various features of interest which are discussed. The numerical model is written in the FORTRAN language. With appropriate input, it can be used to calculate wave interactions with one or two barriers under a wide range of conditions. It is confirmed that the results of the numerical model are consistent for various limiting conditions including those of a solid barrier, a fully transparent barrier, and a barrier extending to the seabed. Overall, the numerical model is found to provide a reasonably flexible and reliable means of predicting wave effects on thin permeable vertical barriers.

Thesis/Dissertation

application/pdf

2009-03-09

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http://hdl.handle.net/2429/5763

Civil Engineering

University of British Columbia

UBCV

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