Summary:

The main aim of the work is to presents the results of examination of some basic granulometric and hydraulic parameters of the discharge within the region of the braided river bar formation. The research was concentrated on the investigation of the armoring layer of the braided bar in terms of the basic sedimentological parameters, and this way on understanding the forming process of this structure. At the same time hydrological measurements were carried out in the region of the bar and on the basis of these hydraulics calculations of hydrodynamics parameters were performed. For granulometric investigations the samples of the gravel forming the braided bar were collected in ten cross sections of the bar. On the basis of sieve analysis the grain size curves were prepared, so the main granulometric characteristics were described, as follows: Trask sorting coefficient, Hazen sorting coefficient, Knoroz grain parameter, Kollis domination parameter, Trask skewness coefficient and Folk mean deviation. The measurements of water velocities just over the river bed allowed calculating main hydraulics parameters, such as: shear velocity, shear stresses, Froude number, Reynolds number, flow resistance coefficient within the region of the braided middle gravel bar formation in the mountainous river. Hydrodynamics survey was done just immediately after the spring flood in 2003 when the braided bar developed within the river channel. The number of observations connected with the hydrodynamics influence on stream braided bar formation was done which describe the braided process of the middle braided bar development. The study was undertaken in the Skawa River at the Polish part of the Carpathian Mountains.