Publicações

Guedes Soares, C. e Neves, S. (2004), “Modelling Tidal Current Profiles by Means of Empirical Orthogonal Functions”, Proceedings of the OMAE Specialty Conference on Integrity of Floating Production, Storage & Offloading (FPSO) Systems, ASME, New York, Paper OMAE-FPSO'04-0044

The derivation of Empirical Orthogonal Functions from the current data makes it possible to separate the local flow variability into two main modes of variance. The paper will discuss the potential and the problems with using this approach by applying it to a specific dataset from west of Shetlands. Measurements of currents with ADCP were made from May till September 1986 and in June and July 1990 and 1991. Observations are divided into four different time series according with the region and period of observation. The observations were obtained in the region of Norwegian Current flow, which mainly influences the local dynamics. A preliminary statistical analysis shows that the average flow is responsible for the major part of the energy associated with the current in the northwest sector of the observations, while the turbulent kinetic energy dominates the flow in the southeast part of the set of observations. The study reveals that the barotropic mode is the most important one in the dynamics of the flow in this region; nevertheless, the baroclinic seems to play an important role flow in the southeast part of the set of measurements, where the flow tends to show some characteristics of diffusive.

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