Summary:

At the present time once can easily noticed very lively discussion about introducing modern, ecological friendly hydraulic structures in river training works which are suppose to stay up to the standards given by hydrobiologists, ecologists as well as fluvial geomorphologists. One of the proposals of such structures is a rapid hydraulic structure (RHS) with increased roughness. Along the presented paper such structure is presented. It was constructed within the river channel of the Sanoczek Stream in the Bieszczady Mountains, a part of Polish Carpathians. One of the main problems connected with changes of stability of hydraulic structures (in that case also with RHS) is velocity of running water causing huge turbulence and shear stresses. Thus, the objective of the following paper is to present the distribution of velocities values along the RHS and within the region of its influence. The main aim of the research was to describe conditions upstream and downstream of the structure and compare them in terms of stability of the RHS. Parallel with the main aim, the distribution of shear stresses as well as shear velocities along the RHS apron and the region within its influence are also presented. The work was conducted in Agricultural University of Krakow and was a part of the master thesis.