The Ekman model used for describing and analysing wind jet-stream drifts caused by aerodynamic friction can also be applied in studies on large watercourses such as for example river mouths. There, in places with no tides, the influence of wind on the distribution of water vertical velocity can be observed. In this paper, the superficial velocities of water were calculated by Ekman’s model, and the wind-induced changes in the superficial velocity in watercourses were established using the tachoid (velocity curve) equation for the coefficient of turbulent viscosity exponentially changing with height. Various conceptions of the a parameter were assumed in describing the turbulence coefficient. The analysis was carried out assuming the conditions existing in the Lower Odra river.

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