Verificação da Variação do Comportamento Hidráulico em um Mecanismo de Transposição de Peixes do Tipo Escada em Diferentes Declividades

Tomé, Fernando; Martinez, Carlos; Faria, Marco Túlio da Silva; Silva, Luiz; Santos, Hersília de Andrade е; Viana, Edna Maria de Faria

doi:10.21168/rbrh.v18n2.p107-116

Cited by 2 publications

(2 citation statements)

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“…Esta verificação foi feita por Tomé et al (2013) que realizou medições do nível da lâmina de água nos tanques usando uma ponta linimétrica. A partir dessas medidas ficou caracterizado que o regime é permanente e uniforme, pois as alturas centrais dos tanques possuem a mesma magnitude.…”

Section: Metodologiaunclassified

Análise do comportamento hidráulico de um mecanismo de transposição de peixes do tipo escada com ranhura vertical em duas declividades

Viana

Martinez

Faria

et al. 2016

RBRH

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Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que o trabalho original seja corretamente citado. ABSTRACTSeveral fish transposition systems (MTP´s) have been employed to allow the fish upstream migration through river dams for spawning. The design of MTP´s of the type of vertical slot fishways requires not only the analysis of the pool hydraulic behavior to evaluate the velocity fields, the energy dissipation levels, and the Reynolds shear stress distributions, but also the study of biological characteristics of aquatic species impacted by the river dams. However, these parameters are not evaluated together, and some of them are valued at the average of the tank. This work deals with an analysis of the main hydraulic characteristics of a slot vertical fishway at two channel slopes, 6% and 12%. The hydraulic characteristic graphs obtained in this work show that a slope of 6% is preferable for the design of this kind of fishway, since the associated velocity magnitudes fits better to the ideal conditions for the safe fish passage. The slope of 12% creates restrictions in terms of the available area for fish passage due to power dissipation and shear stresses conditions.

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Section: Metodologiaunclassified

Análise do comportamento hidráulico de um mecanismo de transposição de peixes do tipo escada com ranhura vertical em duas declividades

Viana

Martinez

Faria

et al. 2016

RBRH

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show abstract

“…They are also less susceptible to erosion in high flow events. Another advantage of vertical slot fishways is that slot designs (shape, number) may be modified to manipulate fishway discharge, pool hydraulics and maximum velocities at different depths within the water column, providing a range of conditions for species with different behaviours and swimming capacities (O'Connor, Mallen‐Cooper, et al., ; Tomé et al., ). Where water levels are less dynamic and a more natural appearance is desirable, however, a rock ramp may be the preferred option.…”

Section: Discussionmentioning

confidence: 99%

Fish‐Net: Probabilistic models for fishway planning, design and monitoring to support environmentally sustainable hydropower

et al. 2018

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The construction of fishways for upstream and downstream connectivity is the preferred mitigation measure for hydropower dams and other riverine barriers. Yet empirical evidence for effective design criteria for many species is missing. We therefore assembled a group of international fishway designers and combined their knowledge with available empirical data using a formal expert elicitation protocol and Bayesian networks. The expert elicitation method we use minimizes biases typically associated with such approaches. Demonstrating our application with a case‐study on the temperate Southern Hemisphere, we use the resulting probabilistic models to predict the following, given alternative design parameters: (i) the effectiveness of technical fishways for upstream movement of migratory fish; (ii) habitat quality in nature‐like bypasses for resident fish; and (iii) rates of mortality during downstream passage of all fish through turbines and spillways. The Fish Passage Network (Fish‐Net) predicts that fishways for native species could be near 0% or near 100% efficient depending on their design, suggesting great scope for adequate mitigation. Sensitivity analyses revealed the most important parameters as follows: (i) design of attraction and entrance features of technical fishways for upstream migration; (ii) habitat preferences of resident fish in nature‐like bypasses; and (iii) susceptibility of fish to barotrauma and blade strike during turbine passage. Numerical modelling predicted that mortality rates of small‐bodied fish (50–100 mm TL) due to blade strike may be higher for Kaplan than Francis turbines. Our findings can be used to support environmentally sustainable decisions in the planning, design and monitoring stages of hydropower development.

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Verificação da Variação do Comportamento Hidráulico em um Mecanismo de Transposição de Peixes do Tipo Escada em Diferentes Declividades

Cited by 2 publications

References 0 publications

Análise do comportamento hidráulico de um mecanismo de transposição de peixes do tipo escada com ranhura vertical em duas declividades

Análise do comportamento hidráulico de um mecanismo de transposição de peixes do tipo escada com ranhura vertical em duas declividades

Fish‐Net: Probabilistic models for fishway planning, design and monitoring to support environmentally sustainable hydropower

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