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<p>Fishways are structures built to help fish move past dams and other barriers in rivers, keeping ecosystems connected. Their performance depends on water flow factors like speed, turbulence, and slowdowns, which affect how easily fish can pass and how much energy they use. This study, done at Kyoto University’s Ujigawa Hydraulic Lab, tests four bed designs, S-FW, R-FW60, R-FW90, and R-OFF, in a controlled flume. By looking at flow patterns, turbulence, and a measure called the Hydraulic Passage Index (<i>HPI</i>), the study shows how bed baffles and shape change water flow and fish movement. The S-FW design, with a steady 1.155&#xa0;m/s flow and low <i>HPI</i>, creates smooth conditions, making it easier for fish to pass. On the other hand, R-FW90 has high turbulence at 44.3%, which is tough for fish that aren’t strong swimmers. R-OFF gives a steady but slow flow, which might be hard for fish with low stamina. R-FW60 strikes a balance with moderate speed and turbulence, offering rest spots for fish with medium swimming skills. These results provide hydraulic insights that can guide fishway design; however, live-fish validation is recommended to confirm passage performance for target species.</p>

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Evaluating turbulence, velocity deficits, and hydraulic efficiency in fishway bed configurations

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Hossein Sohrabzadeh Anzani,
  • Sameh Ahmed Kantoush,
  • Sohei Kobayashi

摘要

Fishways are structures built to help fish move past dams and other barriers in rivers, keeping ecosystems connected. Their performance depends on water flow factors like speed, turbulence, and slowdowns, which affect how easily fish can pass and how much energy they use. This study, done at Kyoto University’s Ujigawa Hydraulic Lab, tests four bed designs, S-FW, R-FW60, R-FW90, and R-OFF, in a controlled flume. By looking at flow patterns, turbulence, and a measure called the Hydraulic Passage Index (HPI), the study shows how bed baffles and shape change water flow and fish movement. The S-FW design, with a steady 1.155 m/s flow and low HPI, creates smooth conditions, making it easier for fish to pass. On the other hand, R-FW90 has high turbulence at 44.3%, which is tough for fish that aren’t strong swimmers. R-OFF gives a steady but slow flow, which might be hard for fish with low stamina. R-FW60 strikes a balance with moderate speed and turbulence, offering rest spots for fish with medium swimming skills. These results provide hydraulic insights that can guide fishway design; however, live-fish validation is recommended to confirm passage performance for target species.