Tidal oscillations of water level in the Great Salma- Rugozerskaya Guba estuary system of the White Sea
Parameters of the tidal oscillations of water level in the Great Salma-Rugozerskaya Guba estuary system in the Kandalaksha Bay of the White Sea were for the first time studied on the basis of field observations. Harmonic analysis of water level oscillations has been carried out at three sites and the spatial structure of tidal oscillations of water level in the estuary system was described. Because of morphometric features tidal oscillations of water level are rather complicated there, leading to pronounced changes of tide phases and increased importance of shallow-water waves for tide formation. Ratio of total amplitudes of quarter-diurnal and semi-diurnal tides is very high (0,2), resulting in the increased asymmetry of tides, i.e. the period of water rise is 2 to 2,5 hours longer than that of water fall. Non-tidal oscillations of water level were also studied by exclusion of tide values from the observation data and further smoothing