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Leaky barriers: leaky enough for fish to pass?

Stephanie Müller1, Catherine A M E Wilson1, Pablo Ouro1,2

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|May 7, 2021
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Summary
This summary is machine-generated.

Leaky barriers for flood management can hinder fish migration. Barrier design, not water flow, significantly impacts juvenile salmon movement, highlighting the need for fish-friendly designs in river restoration.

Keywords:
acoustic Doppler velocimetryfish behaviourfloodingnatural flood managementporous and non-porous hydraulic structures leaky barrier

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Area of Science:

  • Environmental engineering
  • River ecology
  • Fish migration studies

Background:

  • Leaky barriers are eco-friendly hydraulic structures for natural flood management.
  • These structures are increasingly used in upper catchments to reduce flood peaks.
  • Potential impacts on river hydrodynamics and fish passage remain understudied.

Purpose of the Study:

  • To investigate the effects of two leaky barrier designs on hydrodynamics.
  • To assess the influence of barrier design and flow conditions on fish passage.
  • To understand fish behavior and spatial preferences around barriers.

Main Methods:

  • Utilized an open channel flume to test porous and non-porous barrier models.
  • Simulated 100% and 80% bankfull flow conditions.
  • Employed flow visualization and acoustic Doppler velocimetry for hydrodynamic analysis.
  • Conducted behavioral studies with juvenile salmon (Salmo salar).

Main Results:

  • Barrier design, not discharge, was the primary factor inhibiting juvenile salmon movement.
  • Upstream fish passage was significantly influenced by the barrier's physical characteristics.
  • Fish spatial preferences were altered by the presence and type of barrier.

Conclusions:

  • Leaky barrier design critically affects fish passage and upstream migration.
  • Sustainable flood management structures must incorporate fish-friendly criteria.
  • Further research is needed to optimize barrier designs for both flood control and ecological connectivity.