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Water 2018, 10(8), 1066; https://doi.org/10.3390/w10081066

Adaptation of an Existing Intake Structure Caused by Increased Sediment Level

1
School of Engineering, Institute for Energy Systems, The University of Edinburgh, FloWave Ocean Energy Research Facility, Max Born Crescent, Edinburgh EH9 3BF, UK
2
Unit of Hydraulic Engineering, University of Innsbruck, Technikerstraße 13, 6020 Innsbruck, Austria
3
TIWAG-Tiroler Wasserkraft AG, Eduard-Wallnöfer-Platz 2, 6020 Innsbruck, Austria
*
Author to whom correspondence should be addressed.
Received: 20 June 2018 / Revised: 11 July 2018 / Accepted: 2 August 2018 / Published: 10 August 2018
(This article belongs to the Section Hydraulics)
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Abstract

An unexpected and massive redistribution of fine sediment in a large Alpine reservoir was triggered by a further lowering of the water level to conduct maintenance work. This caused the need of a total redesign of the existing head race intake for a high head power plant in the Austrian Alps. Two main geometry options for the trash rack support structure are compared with numerical simulations (ANSYS-CFX) as well as with a scale model test (scale 1:20). The laboratory experiment substantially benefited from the preliminary numerical investigation in respect of the location and implementation of the model boundaries. In return was the confidence in the numerics strengthened by the successful validation of the local head loss and the velocity distribution for the main operation cases. This allowed that the main inputs for the structural design and the further optimisation is conducted only with the 3D-numerical tool. The paper presents the interlaced concept as well as the main finding of the investigation, which lead to a successful adaptation of the intake structure. View Full-Text
Keywords: hydropower; intake; hydraulics of renewable energy systems; hydraulic structure design and management; RANS model; scale model test; validation hydropower; intake; hydraulics of renewable energy systems; hydraulic structure design and management; RANS model; scale model test; validation
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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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Gabl, R.; Gems, B.; Birkner, F.; Hofer, B.; Aufleger, M. Adaptation of an Existing Intake Structure Caused by Increased Sediment Level. Water 2018, 10, 1066.

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