Messanae Universitas Studiorum: No conditions. Results ordered -Date Deposited. 2017-07-23T20:51:27ZEPrintshttp://cab.unime.it/images/sitelogo.pnghttp://cab.unime.it/mus/2012-09-18T07:55:36Z2012-09-18T07:55:36Zhttp://cab.unime.it/mus/id/eprint/602This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/6022012-09-18T07:55:36ZSulle proprietà statistiche e spettrali delle onde generate dal ventoThe mass of wave records taken off the beach at Reggio Calabria enables us to verify a few recent theories on the wind generated waves. In particular, in line with the quasi-determinism theory, we find that the highest waves of each sea state exhibit a well defined period which is related to the autocovariance function. Also the recent concept of indeterminacy of the continuos spectrum is confirmed. The effects of this indeterminacy prove to be more relevant when the line spectrum has two peaks nearly equivalent to each other.Felice Arena2005-06-10Z2012-09-19T08:28:32Zhttp://cab.unime.it/mus/id/eprint/266This item is in the repository with the URL: http://cab.unime.it/mus/id/eprint/2662005-06-10ZNon linear highest sea wave groups in an undisturbed field and in front of a vertical wall In this paper some non-linear effects for the mechanics of sea wave groups with large waves are investigated, either for waves in an undisturbed field or for waves in front of a vertical wall. To the first-order in a Stokes expansion, Boccotti s quasi-determinism theory enables us to foresee the mechanics of wave groups, either in undisturbed or in diffracted fields, when a large wave occurs. The first formulation of this theory shows the random group mechanics when a large crest height occurs (New wave); the second theory formulation gives the random group mechanics when a large crest-to-trough wave height occurs. The quasi-determinism theory in both formulations, for undisturbed fields, was extended recently to the second-order by the author. In this paper the procedure to derive the second-order solution is analyzed and is applied to random wave groups in front of a vertical wall. The non-linear effects are then investigated in space-time domain, and it is obtained a good agreement of analytical predictions with both field data and data from numerical simulation.
Felice Arena