At the present, in modern river training practices and philosophy one can notice coming more into use ecological friendly hydraulic structures. Those, which are especially needed for river training works, as far as expectation of Water Framework Directive is concerned, are rapid hydraulic structures (RHS). What is important, RHS in general do not stop fish and invertebrates against migrating upstream, provide natural and esthetical effects within the river channel, still working as hydraulic engineering structures. Along this paper we described and measured some hydraulic parameters within the reach of chosen rapid hydraulic structures, which we found in the field. The main aim of the research was to describe changes of values of those parame-ters upstream and downstream of the RHS's and to find out their influence on hy-drodynamics of the stream. The study was undertaken on the Porębianka Stream in the Gorce Mountains.Observed hydrodynamic parameters within the reach of the RHS's depend on the location of measuring point and the influence of individual part of the structure. At the same time maximum velocity does not always create the bigger shear force, because it is also depend on the velocity distribution along the hydro-logical profile. ...
Along the paper, the research on chosen hydrodynamic parameters in braided river was described. The research was conducted within the reach of the Ochotnica River in the Gorce Mountains - Polish Carpathians. The research reach was located in the place where two bars in the river were created. In 2003 and 2004 measurements were done in 7 series. Values of flow velocities were measured in the river reach and then shear stresses, dynamic velocities, Reynolds and Froude numbers and Shields parameters were calculated. Analysis of hydro-dynamics parameters allowed to check the hydrodynamic conditions in the river channel. The results show that in the Ochotnica River natural braiding processes are taking place despite of anthropological pressure on the river. ...
This paper presents influence of direction and energy of wind on forming of ventilation air velocity in chosen area of the free stall barn during summer. Based on analysis of obtained measurement results characteristics of the wind speed in summer was made. Variability of the ventilation air velocity with take into account of perpendicular and parallel wind direction was determined. Noticed differentiation of air velocity depending on measurement place - central barn area was less ventilated than area close to wall. Proposals setting out the reasons for the abnormal air flow were formulated. In order to increased ventilation air velocity in central part of the barn recommended use to air mixers. Attention was drawn to need of continue studies of different barn types relative to building construction solution and its localization.
...
