Un nuovo metodo di ricostruzione del moto ondoso mediante la tecnica del trasferimento geografico

The availability of quality, site-specific wave data for the investigated area is necessary for an accurate understanding of wave climate. Direct and indirect wave data often has insufficient spatial resolution to ensure the requirement of geographical representativeness for the area under study. The proposed wave data transfer method, in two versions, transfers entire time series of wave data from a point with data to a neighbouring one. The method is based on the empirical relationships of Shore Protection Manual method and the assumption of equal anemometric conditions at the two points, and involves estimating appropriate statistical parameters from the wind data characterizing the area comprising the two points. The method has been tested and compared with De Girolamo and Contini's method in four applications in the Mediterranean Sea, showing significantly better results in two applications. The lower performance exhibited in the further two applications can be attributed, in one case, to the considerable distance, 112 km, between the point with data and the transfer point, and, in the last case, to the difference between the fetches at those points. In fact, transfer methods are more accurate in the case of modest distances between the two points, which is the classic application of the transfer method in engineering practice. Moreover, the new transfer method is all the more reliable the more similar the fetches between the two points are. The verification of the methods has been carried out by comparing the wave data recorded from one buoy (transfer point) with the simultaneous data obtained at the same point by transferring the wave data recorded from the other buoy (origin point). The proposed wave reconstruction technique presents good accuracy in predictions of significant wave height and peak period and is susceptible to further improvement.