| Title | The Wave Field near the Head of a Breakwater |
| Dept | IOT |
| Year | 2003 |
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| Summary | Published in June 2003 IOT SERIAL No.92-83-762，50pp. A sequential condensation process combined with the multizone boundary element method is developed to make the numerical computations in a large domain possible for calculation of the harbour oscillations excited by a regular progressive edge wave train. While this technique permits solution for complex topography in and near the harbour, numerical results have been calculated for rectangular harbours of constant depth open to a plane sloping beach with a vertical seawall and connected to a horizontal shelf. In these calculations, the slope of the beach is as small as 0.05 so that a favorable comparison can be made with the analytical solution derived by Unluata & Mei (1973) and Mei (1983) for the case of uniform water depth. In each of these two kinds of solutions, there exists a physical parameter which can describe the radiated waves from the harbour entrance with a definite meaning. By using these parameters, a fundamental standing wave inside the harbour has been found and the physical parameter in each kind of solutions can be shown to be linearly proportional to the amplitude of the difference between the overall standing wave and the fundamental one inside the harbour, suggesting that the harbour resonances are not due to the reinforcement of the energy trapping by harbours, but due to an increase of the incoming and outgoing energy fluxes through the entrance. This situation has become even clearer by further examination of the solution of Unluata & Mei (1973) and Mei (1983), which indicates that except the fundamental standing wave, no significant amount of energy inside a rectangular harbour can be partially reflected by the sudden widening at the entrance. |
| Post date | 2004/12/30 |
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