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Sustainability 2018, 10(7), 2406; https://doi.org/10.3390/su10072406

Conversion of Vertical Slot Fishways to Deep Slot Fishways to Maintain Operation during Low Flows: Implications for Hydrodynamics

Water and Environmental Engineering Group, Department of Civil Engineering, University of A Coruña, 15071 A Coruña, Spain
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Received: 28 May 2018 / Revised: 4 July 2018 / Accepted: 6 July 2018 / Published: 10 July 2018
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Abstract

Deep slot fishways (DSF) are similar to vertical slot fishways (VSF) except that a sill has been placed at the base of the slot, and thus require a lower discharge to operate. The conversion of a VSF to a DSF, which requires minimal design modifications, can make for a more flexible design in inflow management, maintaining the correct operation of the fishway in periods of limited water availability. It is, however, crucial to understand the new flow conditions that will be created inside the fishway, and their implications for fish passage. In this paper, the hydrodynamics of DSF were studied for two different pool configurations and five sill heights. The investigation comprised the analysis of the water surface configuration, the velocity and turbulence fields, as well as the definition of the equations that related discharges to depths in the pools. The DSF designs compared well in terms of water surface patterns and maximum velocities with VSFs, but resulted in a more complex three-dimensional flow pattern and increased turbulence levels. Further testing with fish is needed to analyze whether the benefits of retrofitting a VSF by adding a sill during low flows are cancelled out by increased fish passage difficulty. View Full-Text
Keywords: fishway; upstream passage; hydraulic models; flow patterns; velocity distribution; turbulent flow fishway; upstream passage; hydraulic models; flow patterns; velocity distribution; turbulent flow
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Pena, L.; Puertas, J.; Bermúdez, M.; Cea, L.; Peña, E. Conversion of Vertical Slot Fishways to Deep Slot Fishways to Maintain Operation during Low Flows: Implications for Hydrodynamics. Sustainability 2018, 10, 2406.

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