Variations in velocity, sand and silt concentrations observed at two elevations in thernFrisian Inlet are analysed. Using spectral analysis it is investigated how much of the variation inrnconcentration can be explained by the variation in local velocity and current speed.rnConcentration variations in the quarter-diurnal band are directly forced by quarter-diurnalrnvariations in local current speed and are associated with vertical mixing. Concentration variationsrnin the semi-diurnal period band are only marginally the result of the semi-diurnal variations inrnvelocity. These variations are the result of non-local forcing, I.e. Concentration variations inrnNorth Sea and basin. A distinction is made between sediment fluxes resulting from mean andrnfluctuating velocity and concentration. The dominant contribution to the fluctuating transport isrnby variations in the semi-diurnal period band. At the measurement location, the total sedimentrnfluxes are in the flood direction.
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