This report presents the results of basic model tests of the occurrence of resonant oscillations in harbor basins induced by long-period waves. The objectives of the experiments were to find out practicable means suitable for minimizing to a satisfactory degree the effects of resonant amplifications which, in most cases, are dangerous for shipping and harbor operations.nOut of the numerous possibilities applicable to improve the nau¬tical and operational conditions in harbors subject to long-period waves, the insertion of transversal moles of different lengths and groupings was selected for studies. The effects of such transver¬sal moles on the vertical and horizontal water motions in a basin were investigated experimentally. The utilization of transversal moles for this purpose is considered serviceable because the moles simultaneously may be of use for harbor operations.
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