Utilising the boundary layer to help restore the connectivity of fish habitats and populations. An engineering discussion

  title={Utilising the boundary layer to help restore the connectivity of fish habitats and populations. An engineering discussion},
  author={Hubert Chanson},
  journal={Ecological Engineering},
  • H. Chanson
  • Published 1 December 2019
  • Geology
  • Ecological Engineering
Abstract While leading scholars emphasised the role of turbulence in waterways and the complex fish–turbulence interactions, what do we really know about turbulence? A recent paper developed a comparison between different boundary treatment to improve upstream passage of small fish in box culverts. The limitations of the work are discussed. It is argued that the practical engineering design implications cannot be ignored, while a solid understanding of turbulence typology is a basic requirement… 

Figures from this paper

Hybrid modelling of low velocity zones in box culverts to assist fish passage: Why simple is better!
Funding information Australian Research Council, Grant/Award Number: LP140100225; Department of Transport and Main Roads, Queensland Government, Grant/Award Number: TMTHF 1805; School of Civil
How full-height sidewall baffles affect box culvert capacity: balancing fish passage and discharge requirements
ABSTRACT Low-level river crossings and culverts deliver valuable transportation and hydraulic control services to the society, but have negative impacts in terms of upstream fish passage. Recently,
Low-Velocity Zone in Smooth Pipe Culvert with and without Streamwise Rib for Fish Passage
AbstractUnimpeded waterway connectivity is a requirement for all freshwater fish. While box culverts are considered the most effective design in terms of upstream fish passage, circular culverts ar...
Hydrodynamics and secondary currents in an asymmetrical rectangular canal with streamwise beam
While the literature on transverse beams in open channels is broad, there is comparatively less understanding of the hydrodynamics of channels with streamwise ribs. In the current study, an


Utilising the boundary layer to help restore the connectivity of fish habitats and populations
Novel remediation designs are presented that exploit the reduced water velocity in boundary layers along the culvert wall to enhance fish passage without significantly compromising discharge capacity and are significantly advantageous to the swimming endurance and traversability for six small-bodied Australian fish species.
Culvert hydrodynamics to enhance upstream fish passage: fish response to turbulence
Waterway culverts are very common structures along water systems, ranging from rural roads to national highways and urban drainage networks. Current design guidelines are inadequate for fish passage,
Modelling upstream fish passage in standard box culverts: Interplay between turbulence, fish kinematics, and energetics
Box culverts are common hydraulic structures along rivers and streams, in rural and urban water systems. The expertise in fish-friendly culvert design is limited, sometimes leading to adverse impact
Alternative mitigation measures for fish passage in standard box culverts: Physical modelling
Road crossings and culverts are common man-made structures along river courses, ranging from national highways to rural roads and urban networks. Present expertise in culvert hydraulic design is
Using small triangular baffles to facilitate upstream fish passage in standard box culverts
A culvert is a covered channel to pass streams and floodwaters through an embankment. The ecological impact of culverts has been recognised, in particular in terms of stream connectivity, but
Developing Cost-Effective Design Guidelines for Fish-Friendly Box Culverts, with a Focus on Small Fish
This approach is novel and relies upon an accurate physically-based knowledge of the entire velocity field in the barrel, specifically the longitudinal velocity map, because fish tend to target low-velocity zone (LVZ) boundaries.
Ventilated Corner Baffles to Assist Upstream Passage of Small-Bodied Fish in Box Culverts
Standard box-culvert designs are similar to ancient designs. The acknowledgment of the ecological impact of culverts and road crossings on rivers has led to changes in culvert design guidelines. A
Hydraulic Performances of Minimum Energy Loss Culverts in Australia
Culverts are among the most common hydraulic structures. Modern designs do not differ from ancient structures and are often characterized by significant afflux at the design flows. A significant
Laboratory Study of Fish Passage and Discharge Capacity in Slip-Lined, Baffled Culverts
AbstractCulvert rehabilitation is a cost-effective alternative to culvert replacement for many applications where the culvert has reached the end of its useful life. When a profile-walled existing