Unsteady longitudinal turbulence characteristics are studied in natural conditions in small, lowlad Wilga River in Poland. Two controlled flood waves were discherged in the river reach and their dynamics was discussed in the paper. Instantaneous velocities were measured continuously at selected points. The Fourier component method was utilized to obtain basic time-dependent characteristics of turbulence, namely: mean velociyies, root mean square of fluctuating velocities. Turbulent intensity, skewness and flatness. The modulation of turbulence by flood waves was also presented.
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