[PDF] Full-Height Sidewall Baffles in Box Culvert to Assist Upstream Fish

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ABSTRACT

River crossings and culverts are important for delivering a range of socio-economic services, including

transportation and hydrological control, but have negative impacts on freshwater river ecology, including

small-body-mass native fish species and juvenile of larger fish. In relation to upstream fish passage, the

excessive barrel velocities have a major negative impact on weak-swimming fish. Recently, full-height sidewall

baffles have been proposed to assist upstream passage of small fish across a wide range of discharges, although

the impact on the culvert hydraulics is not well understood. Physical modelling was conducted under controlled

flow conditions in a 0.5 m wide rectangular channel, equipped with full-height sidewall baffles. Detailed free-

surface and velocity measurements were performed at several locations along and across the channel for a

broad range of discharges and baffle geometries. The findings demonstrated a drastic reduction in discharge

capacity of the box culverts with the installation of full-height sidewall baffles, with increasing adverse impact

as the flow rate increases for a given structure. In many cases when the discharge capacity cannot be

compromised, alternative designs may be considered to assist upstream fish passage, e.g. small corner baffles,

asymmetrical roughness.

Keywords: Sidewall baffles, Standard box culverts, Asymmetrical rectangular flume, Physical modelling,

Recirculation.

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Disaster Prevention Research Institute Bulletin

British Standard Code BS 1042:1943

Journal of Irrigation and Drainage Engineering

Environmental Fluid Mechanics

Report FHWA/MT-07-010/8181

Butterworth-Heinemann

CRC Press

CRC Press

Fisheries Queensland

Journal of Hydraulic Engineering

Science

River Research and Applications

Journal of

Hydraulic Division

Bulletin Français

de Pêche et Pisciculture

Hydraulic Model Report No. CH115/19

Environmental Management

Journal of Fluid Mechanics

Transactions

Journal of Hydraulic Engineering

Journal of

Fluid Mechanics

NACA Technical Note 3488

Proc.

38th IAHR World Congress

Proc.

24th IAHR Biennial Congress

Journal of Ecohydraulics

Journal of Hydro-environment Research

quotesdbs_dbs44.pdfusesText_44

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