Group bounded long waves in physical models |
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| Authors: | V Barthel EPD Mansard SE Sand FC Vis |
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| Institution: | 1. National Research Council, Ottawa, Canada;2. Danish Hydraulic Institute, Copenhagen, Denmark;3. Delft Hydraulics Laboratory, Delft, The Netherlands |
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| Abstract: | During the last few years it has been shown that the results of model tests of harbour basins and moored ships are highly dependent on the correct reproduction of wave groups and the attached long waves. Although these bounded long waves are of second order and thus of a rather limited height, resonance and shoaling effects can increase their influence on the results of model investigations. In traditional first order wave generation, the boundary conditions at the wave board are not fulfilled for the bounded long waves, and consequently various spurious, free long waves are unintentionally produced. This paper outlines the general equations and the solution for a rotating and translating wave board. The translatory case is treated in detail, i.e. a physical interpretation of all the second order terms is given, and an approximate control signal for the suppression of spurious long waves for practical use is described. Finally, laboratory experiments successfully verify the various long wave terms and the effectiveness of the suppression terms. |
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