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. ...
Paper concerns show of laboratory experiment program of the electricelectronic barrier application ingoing to Electronic Deterrent Fish System to its protection against negative influence of hydrotechnical facilities. Investigations have been performed at Hydraulic Laboratory of Wrocław University of Environmental and Life Sciences, and will be tend towards determination of optimal technical parameters of the tested facilities for specified hydraulic conditions within the water plants. The Union Water Instruction and national controls determined requirements fish protection of inland waters. Free two-environment fish migration in canalized rivers can be realised by water plant modernization based on construction of fish passes friendly for environmental and assembly of electricelectronic facilities as barriers. In our opinion these barriers should be enable fish migration upwards and downwards, and its localization and construction should be secure simpler passage across fish passes. This publication has been coasted from the research project means No. 00029-61535-OR0100002/06 on “Efficiency studies of the facilities to control of fish behaviour at inlets to water intakes and fish passes”, realised by Wrocław University of Environmental and Life Sciences. This project is financed by European Union and national budget in frame of Sectorial Operating System on “Fishery and Fish processing 2004-2006”. ...
The verification of the project of designed spillway of Chwalimierz reservoir was the main purpose of conducted research. The Chwalimierz reservoir was designed by Water Service Ltd. in order to protect the valley from flood as well to ensures, water for rural cultivation irrigation. This reservoir is going to be built on Sredzka Woda, and will decrase flood wave in order to protect the city Sroda Slaska. This research was conducted on Water Laboratory at Environmental Engineering Department of Wroclaw University of Environmental and Life Science. The research was executed using 1:10 scale. The investigation included the hydraulic analyses of spillway especially the verification of the flow rate curve. The water delivery is assembled by inlet chamber with two pipelines (diameter 1000mm) with valves and spillway (3*1,70m) which is located on overfall crest of vertical well. The water from service spillway is carried of to low station channel. The length of it is about 30 m and it is ended with trough. In this paper Authors presents methodology of model research and comparison of theoretical calculation with model research results. The research has confirmed the correctness of assumed design. The small differences between model research and theoretical calculations allow to ...
The Brzeg Dolny Dam functioning since the year 1959 consists of a fivegate weir, sluiceway, powerhouse and a fishpass. The concrete pool pass has 26 chambers separated by vertical cross-walls each with one top notch and one submerged bottom orifice positioned alternately. The bottom of each following chamber, beginning from the inlet, drops by approx. 30 cm. Connection with tailwater is available through 3 entrances one above the other, what enables water supply within a wide range of head- and tailwater levels. Field studies and hydraulic analysis of the pass permitted to estimate its operation effectiveness confronted with the changed water level on the weir from 108.00 m.a.s.l. to 107.50 m.a.s.l. and lowered tailwater level due to river bottom erosion. The study showed that the fishpass sustained its function. This paper also presents recommendations towards the improvement of the pass functioning by its conversion into vertical slot pass and by the use of electric-electronic barriers protecting fishes from getting into turbines and directing them to the pass. ...
The main aim of the article is to show (present) the influence of vegetation zone on concentration of suspended load. New standards (principles, rules) of river engineering conducted in harmony with nature assign enormous plant significance. It is treated not only as a natural factor but also as a component of hydraulic reaction which clearly shapes hydraulic and hydrologic conditions. Until recently it was generally believed that vegetation is only the faktor which makes exploatation of water facilities difficult and unfavourably influence on structure working. At present vegetation has begun to be appreciated as a new element in contemporaly water management which may favourably influence on hydraulic conditions. Vegetation may cause riverbed roughness changes, bed configuration changes, water level slope changes increase of riverbed erosion resistance and also may cause retention of considerable amount of suspended load transported by (in) the river. Existing of vegetation zone in rivers and reservoirs influences on fluvial processes. Vegetation degree and its vertical and horisontal dimension influence on longitudinal and transverse transport of suspended load as well as its variation dynamics. The research of the suspended load transoport in vegetation zone was conducted in Institute of Environmental Engineering on model in scale 1:1. The ...
