Aim of the study:
This study investigates the hydraulic and turbulent characteristics of three fundamental hydromorphological units—pools, runs, and riffles—along a mountain reach of the Skawa River.

Material and methods:
Measurements of three velocity components (Vx, Vy, and Vz) were used to determine the flow velocity magnitude, the velocity fluctuations (RMSvmag), turbulent kinetic energy (TKE), and the degree of turbulence (K).

Results and conclusions:
The absolute variables describing turbulent flow phenomena (Vmag, RMSvmag, and TKE) clearly differentiate among pools, riffles, and runs, whereas the relative turbulence parameter (K) primarily distinguishes between pools and riffles. The turbulence intensity was highest in riffles and lowest in pools. Furthermore, the observed velocity distributions were consistent with the typical velocity profile, showing a decrease in flow velocity and a concurrent increase in turbulence toward the channel bed. Pools exhibited the greatest internal variability in turbulence parameters compared to the other hydromorphological units. These findings highlight that turbulence characteristics display substantial spatial variability both within and among hydromorphological units. Such variability should be considered in the design and implementation of river restoration measures, particularly in mountain rivers where channel morphology strongly influences flow structure.