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Rehabilitation and improvement of the Túneis hydroelectric undertaking. Hydroelectric and environmental issues
Published in Bjørn Honningsvåg, Grethe Holm Midttømme, Kjell Repp, Kjetil Arne Vaskinn, Trond Westeren, Hydropower in the New Millennium, 2020
J. Vazquez, L. Gusmão, D. Estrela
Unblocking of the head pond and removal from all its surrounding area of the sediment transported and softened due to successive detachments and sliding of earth material, blocks, tree trunks and shrubs; ii) Reconstruction and strengthening of a reinforced concrete wall section; iii) Cleaning and maintenance of the trash rack and associated equipment.
Experimental investigation on flow of trash rack blockage in front of pumping station
Published in Journal of Hydraulic Research, 2023
Tianxu Yan, Baoyun Qiu, Jianping Yuan, Guipeng Qi
The circulation system of the test bench for trash blockage is shown in Fig. 1a, which includes a transparent organic glass inlet passage, a transparent organic glass flume, a trash rack, a pump, an outlet conduit, a regulating valve, an outlet sump, and a triangular weir. The parameters of the experimental pump are as follows: design flow rate 25 l s−1 and rated speed 2860 rpm. As shown in Fig. 1b, to observe the gathering process and trash aggregation patterns and to measure the velocity distributions at the front and back of the trash rack conveniently, a transparent organic glass flume is set in front of the inlet passage with a trash rack. The transparent organic glass flume is 0.3 m × 0.7 m × 1.8 m. The trash rack is made of stainless steel by welding, 0.3 m × 0.8 m. The border is four flat steel plates of 4 mm × 20 mm, cross beams include six flat steel plates of 5 mm × 10 mm, grid bars are 18 stainless steel wires of 2 mm in diameter, beam spacing is 0.13 m, and bar spacing is 0.015 m. The trash rack is 10 cm before the entrance of the inlet passage of the pump system, with a 75° angle between the trash rack surface and the flume bottom.