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- Comparison of coarse-resolution rapid methods for assessing . . .
A total of 52 structures were assessed using the SNIFFER protocol for fish passability in the period 2014–2017, in the context of an overall policy aim of IFI to develop a national geographic information sys-tem‐based layer of river barriers (Figure 1) Where barrier mitigation is being considered, it is IFI policy to undertake SNIFFER
- Riverine obstacles to fish movement: a rapid assessment tool
• SNIFFER (2012) WFD111 (2a) Coarse resolution rapid-assessment methodology to assess barriers to fish migration • Jump, Swim or Combination obstacles • Water velocities, distances, and water depths are measured at appropriate locations to describe variation and include potential fish passage routes • Combinations of measurements
- SNIFFER with ICE: a taster of barrier assessment issues
SNIFFER: Subjective element can significantly affect passability scores • Turbulence: entrained air and chaotic flows associated with high water velocities and plunging flows at riverine obstacles • Standing wave: Problems for fish passage by causing them to become disoriented and water velocities can exceed swimming capacity
- Fish barrier assessment of Peggies Mill and Dowies Mill weirs . . .
An assessment of the passability or otherwise of Fair-a-far Mill and Dowies Mill weirs was carried out by SEPA fish ecology using the WFD111 barrier porosity assessment methodology1 This
- Accuracy of coarse-resolution protocols for assessing fish . . .
The positive relationship between empirically derived fish passage data and SNIFFER but not ICE passability scores may relate to several factors First, there are fundamental differences between the protocols in how the passability scores are derived
- A toolkit for optimizing fish passage barrier mitigation actions
The assessment method uses rule-based criteria for fish morphology, behaviour, and swimming and leaping ability to estimate barrier passability Barrier passability represents the fraction of fish (in the range 0–1) that are able to successfully negotiate a given barrier in the upstream or downstream directions
- Accuracy of coarse-resolution protocols for assessing fish . . .
Several coarse-resolution rapid barrier assessment protocols have been developed to estimate fish passability at river infrastructure to aid decision making in relation to catchment scale barrier management
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