Session C8: Turbulent Flow Field Around Angled Bar Racks
Location
Groningen, The Netherlands
Event Website
http://fishpassage.umass.edu/
Start Date
24-6-2015 3:15 PM
End Date
24-6-2015 3:40 PM
Description
Abstract:
VAW of ETH Zurich conducts research on louvers and angled bar racks, so-called ‘fish guidance structures’ (FGS) for run-of-river hydropower applications. The purpose of the system is to improve the sustainable and efficient usage of hydropower by providing safe downstream fish guidance past the hydropower intake, guidance towards a fishbypass collection system, and minimizing negative economic impacts. The FGSs create complex two- and three-dimensional flow structures at different scales in the water column near them and the bypass, which can be sensed and behaviorally avoided by approaching fish. This paper presents the results of an experimental investigation on bar racks with and without a solid bottom overlay angled at 15° and 30° to the approach flow in a laboratory flume. The bars or slats were angled 45° against the flow direction. The bar spacing, thickness, and length were 0.05 m, 0.01 m and 0.10 m, respectively. The mean approach flow velocity and flow depth were 0.60 m/s and 0.9 m/s, respectively. Profiles of longitudinal and transversal flow velocity components and turbulence characteristics in the water column were measured upstream, downstream, and around the structures using 2D-Laser Doppler Anemometer at 1 kHz. The results of the experiments will be presented and discussed in relation to fish guidance efficiency of the investigated bar rack configurations obtained from live-fish experiments. In the companion paper by Peter et al. 2015, the results of live-fish experiments carried out in the same flume for the same and different bar rack, and flow configurations will be presented.
Session C8: Turbulent Flow Field Around Angled Bar Racks
Groningen, The Netherlands
Abstract:
VAW of ETH Zurich conducts research on louvers and angled bar racks, so-called ‘fish guidance structures’ (FGS) for run-of-river hydropower applications. The purpose of the system is to improve the sustainable and efficient usage of hydropower by providing safe downstream fish guidance past the hydropower intake, guidance towards a fishbypass collection system, and minimizing negative economic impacts. The FGSs create complex two- and three-dimensional flow structures at different scales in the water column near them and the bypass, which can be sensed and behaviorally avoided by approaching fish. This paper presents the results of an experimental investigation on bar racks with and without a solid bottom overlay angled at 15° and 30° to the approach flow in a laboratory flume. The bars or slats were angled 45° against the flow direction. The bar spacing, thickness, and length were 0.05 m, 0.01 m and 0.10 m, respectively. The mean approach flow velocity and flow depth were 0.60 m/s and 0.9 m/s, respectively. Profiles of longitudinal and transversal flow velocity components and turbulence characteristics in the water column were measured upstream, downstream, and around the structures using 2D-Laser Doppler Anemometer at 1 kHz. The results of the experiments will be presented and discussed in relation to fish guidance efficiency of the investigated bar rack configurations obtained from live-fish experiments. In the companion paper by Peter et al. 2015, the results of live-fish experiments carried out in the same flume for the same and different bar rack, and flow configurations will be presented.
https://scholarworks.umass.edu/fishpassage_conference/2015/June24/49
Comments
Presenting Author: Dr. Ismail Albayrak received his M.Sc. in Hydraulic Engineering from Istanbul Technical University in 2003 and obtained his Ph.D. in the field of environmental hydraulics at the Federal Institute of Technology in Lausanne (EPFL) in 2008. He worked for three years in a project on flowplant interactions at the University of Aberdeen. Since 2011 he has been working as a senior researcher at the Laboratory of Hydraulics, Hydrology and Glaciology (VAW) of ETH Zurich.