Author(s): H. T. Johnston; E. M. Elsawy; G. Hamill; H. G. Mc Killen
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Abstract: The propeller action of a ship near to a berth structure often produces scouring and deposition within the harbour area. In recent years, problems of this type have become widespread with the increase in size and installed power of ships. In this investigation, propulsion action was simulated by both the use of a scaled propeller and a momentum jet fitted with a swirl-producing plate. Dimensi onal considerations were used to deduce scaling relation- ships. The resulting velocity fields were monitored and found to be sinilar. The development of erosion on a flat mobile bed was investigated and a non-dimensional depth/ time relation- ship was established. It was thought useful to expand the laboratory study by investigating a scaled model to the berth structure in the testing tank with the swirling jets at one end and the model of the structure. placed on the opposite side. The scour and deposition patterns of two and four years of berth usage were. reproduced using this technique. The model study producer. in general, a bed profile conformity with the prototype records.
Year: 1985