The aim of the following paper was to present the level of the chosen trace elements such as: Cd, Cr, Cu, Ni, Pb and Zn which were deposited within the bottom sediments in the region of hydraulic structures. Special attention was put to sediments trapped in the pools of check-dams and small channel bars found along the channelized parts of the mountain streams. The research was conducted on three Polish Carpathian streams: the lłynne stream, the Kudowski, and the Lubanski stream – all in the Gorce Mountains. All of the investigated streams are partly channalized and partly are in natural conditions. The contamination was stated in sediments of the Mlynne Stream in case of Ni, Cu and Cr. The sample were collected upstream the barrage (Ni and Cu) and ad the barrage Cr. The plant covers were determinated mainly by hydraulic structures. In case of vegetation the biggest anthropopression was stated in upstream of barrage sections located on the Mlynne and Kudowski Streams. ...
The regulated weirs are the high river bars constructed across to channel axis, which overfall crest is situated within the range from 0,5 m to 2,0 m, at level of down stage. These weirs are constructed in rivers and mountain streams, and characterized usually of relatively deep channel intersection, which make impossible application of the by-pass channels for fish. The only solution is then fishway located at the weir width. Fish passed can be occupy the all weir width and then it creates the stone ramp, changing the function of the weir rapid. So as, to keep the previous function of weir, the fish passage is constructed as riverbed connecting the upper and the lover station, as an half-timbered fish passed. In the paper has been presented the own design of the half-timbered fish passed (combination of the rapid and chamber fish passed). The proposed type of the fish passed has been exposed to the laboratory studies on model in the scale of 1:10. Basing oneself on the results of model studies, two half-timbered fish passed have been designed and realized in streams of the Sudety plateau. ...
The paper presents results of hydraulic modelling of block ramps (BR) made of natural stones (seven constructional solutions) and compares them with the results of classical research by Peterka. The main aim of the paper is to provide a simplified solution to determining the dimension of stones fixed to the sloping apron of the BR in order to reduce energy of flowing water along the ramp. This new way of assessing the dimensions of stones along BR sloping apron is presented with proposals on how to calculate stone dimension. The paper is dedicated to hydraulics engineers, scientists, designers, practitioners and also to researchers in the field of low-head hydraulic structures. ...
