Baffle designs to facilitate fish passage in box culverts: a preliminary study

Chanson, H. and Uys, W. (2016). Baffle designs to facilitate fish passage in box culverts: a preliminary study. In: Brian Crookston and Blake Tullis, Hydraulic Structures and Water System Management. 6th IAHR International Symposium on Hydraulic Structures. IAHR International Symposium on Hydraulic Structures, Portland, OR, United States, (295-304). 27-30 June 2016. doi:10.15142/T300628160828

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Author Chanson, H.
Uys, W.
Title of paper Baffle designs to facilitate fish passage in box culverts: a preliminary study
Conference name IAHR International Symposium on Hydraulic Structures
Conference location Portland, OR, United States
Conference dates 27-30 June 2016
Proceedings title Hydraulic Structures and Water System Management. 6th IAHR International Symposium on Hydraulic Structures
Journal name 6th International Symposium on Hydraulic Structures: Hydraulic Structures and Water System Management, ISHS 2016
Place of Publication Logan, UT, United States
Publisher Utah State University
Publication Year 2016
Sub-type Fully published paper
DOI 10.15142/T300628160828
Open Access Status DOI
ISBN 9781884575754
Editor Brian Crookston
Blake Tullis
Start page 295
End page 304
Total pages 10
Collection year 2017
Language eng
Abstract/Summary Waterway culverts and road crossings are very common structures along water systems, ranging from rural roads to national highways and urban drainage networks. Present expertise in environmental hydraulics of culverts is deficient because of the many empirically-based design guidelines, which are sometimes outdated and often inadequate for fish passage. Engineers and biologists need better, more reliable prediction 'tools' during the design stages to compare the bio-engineering performances of a range of design options. In all the cases, the turbulence of the flowing waters must be optimized efficiently to maximize fish migration. This project focused on the development of simple solutions to retrofit existing box culverts, with the aim to maximize slow flow regions suitable for small fish passage and to minimize the afflux increase. Herein, a physical study of a standard box culvert was performed under controlled flow conditions, and six baffle designs were tested. Two baffle configurations presented promising results: the corner baffles and the streamlined diagonal baffles. The streamlined diagonal baffles assisted with the development of a large recirculation region immediately downstream of each baffle, with a moderate increase in afflux for a given discharge. The optimum design appeared to be the corner baffle system. It produced little additional afflux, while creating excellent recirculation both upstream and downstream of each baffle. However, further testing must be conducted to develop quantitative design guidelines and to assess the impact on real fish passage.
Keyword Culverts
Fish passage
Upstream migration
Baffles
Physical study
Small fish
Australian native fish species
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Civil Engineering Publications
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Created: Tue, 19 Jul 2016, 06:07:30 EST by Hubert Chanson on behalf of School of Civil Engineering