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Turkish Journal of Fisheries and Aquatic Sciences 2012, Vol 12, Num, 5     (Pages: 435-443)

Method of Detecting the Long-Wave Structure of Sea Currents, Measured Only in One Point

Nikolay Grigorjevich Horolich 1 ,Vladimir Nikolaevich Horolich 2

1 Marine Branch of Ukrainian Hydrometeorological Institute, 61, Sovetskaya St, 99011, Sevastopol, Ukraine
2 Sevastopol State Technical University, Striletska Balka, 99053, Sevastopol, Ukraine
DOI : 10.4194/1303-2712-v12_2_34 Viewed : 3602 - Downloaded : 2277 It is shown within the framework of the semi-spectral linear model of wind-driven currents, that if temporal changes of the level inclination are mainly of a reverse character, that takes place in case of long-wave structure of gradient currents, then the similarity of their spectral tensors (the spectral tensor similarity criterion) does not depend on the level and bottom inclinations and is determined only in depth, by a vertical coordinate, viscosity, the angular frequency and the Coriolis parameter. This criterion will allow to investigate the harmonic (or wave) and the turbulent nature of sea currents, taking into account the diversity of their scales, polycyclicity, as well as other features of the development of both known and unknown factors generating them with the observations made only at one point. It can be used primarily for the reanimation of measurements of shelf currents in terms of detection, such as the development of its waveguide properties, since, in spite of a fairly significant amount of them, because of spatial-temporal discontinuity, is not enough for the use of traditional approaches. The hydrodynamic model and a brief comparative analysis of vector-algebraic method and the method of rotational components used in the spectral analysis of vector time series are shown. The analysis of long-wave velocity structure of the sea currents on the Kerch shelf of the Black Sea obtained by the proposed approach are presented as an example. Keywords : shelf, velocity, level, semi-spectral model, spectral tensor similarity