EVALUATION OF SAFETY OF FLOATING ARTIFICIAL ISLANDS

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Ocean engineers are interested in concept of floating structures as large as several thousand meters long. This type of structures are intended to be used as, for example, floating airports unusual size of them may require new technology especially for accurate evaluation of their safety for very long period, say 100 years. Prediction of their safety must be extremely reliable with this type of structures. Objective of this project is to establish a new methodology for evaluating the safety of large floating structures of unusually large size and unusually large age expected. For this we have studied. (1) Response of floating structures, whose scale is comparable to the topographical scale, to stormy waves and its rational predicition method. (2) Improvement of reliability of wave forecast for very long period (100years) at the sites in particular, close to shore where the floating islands are expected to be deployed. Our results are as follows. (a) Analytical method to predict wave forces on a floating platform supported by numerous floats of vertical and truncated circular cylinder was developed and numerically implemented. In this method the topographical effect at shore region is accounted for mathematically correct way. (b) Hydroelastic behavior of large floating structure interacting sea was studied and its correct prediction method was proposed. (c) We proposed a new methodology of wave forecast at shore region and for very long years based on the wave observation data by the ocean tower of Research Institute of Applied Mechanics, Kyushu University and a new mathematical wave forecast model.