Vergleich von Prognosemodellen zur Berechnung der Turbinen bedingten Fischmortalität

Keuneke, Rita; Dumont, Ulrich

doi:10.1007/bf03241671

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…If no effective measures are taken to impede turbine entrainment, injuries can occur, eventually leading to high mortality rates due to turbine passage [9,10]. These mortality rates largely depend on biotic conditions (such as fish species, size or fitness) and abiotic/technical factors (such as turbine type and size, net head or rotational speed) [11].…”

Section: Introductionmentioning

confidence: 99%

Retrofitting of Existing Bar Racks with Electrodes for Fish Protection—An Experimental Study Assessing the Effectiveness for a Pilot Site

Haug

Auer

Frees

et al. 2022

Water

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Downstream-migrating fish in rivers tend to follow the main current, and are in danger of swimming through the turbines at run-of-river hydropower plants, possibly causing high mortality rates. To avoid these losses, fish must be prevented from entering the turbines. Most existing vertical bar rack systems (used for turbine protection) however usually do not ensure proper fish protection due to large bar spacings. FishProtector technology enables the retrofitting of existing bar racks (i.e., the mechanical barrier) with additional electrodes to create a hybrid barrier. The induced electric field in the water aims to create a behavioral barrier to prevent fish passage through the bar rack. In this study, ethohydraulic experiments to investigate the effect of such a behavioral barrier on fish were performed. In detail, the fish-protection rate at a bar rack with a bar spacing of 30 mm was tested in five different scenarios: (i) a bar rack without electrodes (reference), and four electrified setups with electrode spacings of (ii) 80 mm, (iii) 120 mm, (iv) 160 mm, and (v) 200 mm. A flow velocity of 0.23 m/s was chosen to replicate the situation at a planned pilot site. The study was conducted in an outdoor laboratory flume using small fish of several local riverine species, mostly cyprinids and minnows. The results show that the mean fish-protection rate in the experiments could be increased from 62% in the reference setup up to 96% in the electrified setups.

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Section: Introductionmentioning

confidence: 99%