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<p>Dynamic hydropower operations involving the release of water into streams and rivers cause artificial water level fluctuations, commonly known as hydropeaking. During base flow conditions, portions of the riverbed may dry out, increasing the risk of fish stranding and subsequently raising mortality rates. To mitigate or eliminate this impact, it is necessary to establish ecologically acceptable threshold values for water down-ramping rates and the extent of the water fluctuation zone. In line with this objective, Grimsel Hydro, commissioned by the Swiss Federal Office for the Environment, conducted fish stranding experiments with wild-caught, freshly emerged brown trout larvae on a large gravel bank in the Hasliaare. A water fluctuation zone with a width of 11 m was used, which is considerably larger compared to previous fish stranding experiments. Due to the extensive logistical effort required, only 18 trials were performed using a wide range of water down-ramping rates. The results of these experiments indicate that fish stranding risk correlates with increasing down-ramping rates and the area of the fluctuating water zone. Based on these experimental findings and experiences from various hydropeaking mitigation projects, the authors conclude the article with practical recommendations. </p>

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Schwall-Sunk-Sanierung: Strandungsversuche mit Forellenlarven aus natürlicher Reproduktion und Empfehlungen für die Planung von Sanierungsmaßnahmen

  • 期刊论文

  • 发表日期：

    2025年1月2日

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  • Steffen Schweizer,
  • Matthias Meyer,
  • Benjamin Berger,
  • Basil Wagner,
  • Maurus Meier,
  • Jan Baumgartner,
  • Robin Hochgesand,
  • Peter Büsser,
  • Lorenzo Gorla

摘要

Dynamic hydropower operations involving the release of water into streams and rivers cause artificial water level fluctuations, commonly known as hydropeaking. During base flow conditions, portions of the riverbed may dry out, increasing the risk of fish stranding and subsequently raising mortality rates. To mitigate or eliminate this impact, it is necessary to establish ecologically acceptable threshold values for water down-ramping rates and the extent of the water fluctuation zone. In line with this objective, Grimsel Hydro, commissioned by the Swiss Federal Office for the Environment, conducted fish stranding experiments with wild-caught, freshly emerged brown trout larvae on a large gravel bank in the Hasliaare. A water fluctuation zone with a width of 11 m was used, which is considerably larger compared to previous fish stranding experiments. Due to the extensive logistical effort required, only 18 trials were performed using a wide range of water down-ramping rates. The results of these experiments indicate that fish stranding risk correlates with increasing down-ramping rates and the area of the fluctuating water zone. Based on these experimental findings and experiences from various hydropeaking mitigation projects, the authors conclude the article with practical recommendations.