Graduate Thesis Or Dissertation
 

Wave diffraction due to trenches and rubble

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cv43p0809

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  • Two types of boundary element models are developed for the interaction of waves with trenches. The first type is for a two-dimensional domain in the horizontal plane and employs the linear long wave approximations. It is shown that appropriate selection of pit geometries leads to a significant reduction in wave height behind the pits. Wave heights in the lee can be reduced to 10% of the incident wave height by two similar pits that have approximate geometries of one or more wave lengths in the shore parallel direction, one-half a wave length in the cross-shore, a depth three times that of the adjacent water, and spaced approximately one-half wave length apart. Examples are presented which show how to select pit geometries to provide shoreline protection or a harbor area. An example is also presented showing how a properly placed pit can significantly reduce wave heights in a navigation channel. The second type of boundary element models is developed for a two-dimensional domain in the vertical plane and are valid for all water depths. These models are for an infinitely long trench, which can contain rubble. Energy dissipation due to rubble in the trench is estimated using a linearized friction coefficient. Results indicate that highly permeable material in the pit does not significantly degrade (and some specific cases actually improves) the performance of the trench as a breakwater. Therefore, it is not necessary to remove all of the coarse aggregate from the trench. This would significantly reduce the construction cost.
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Dichiarazione dei diritti
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file details FurukawaKeizo1991.pdf 2017-08-15 Pubblico Scaricare