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<p>Turning pools contribute to creating a more compact fishway design, alleviating the topographic constraint and optimizing the entrance location. Up to now, the hydrodynamic optimization of turning pools has failed to receive adequate attention. By conducting 3-D numerical simulations, this study proposes and compares eleven 90°-turning pool configurations (i.e. Scheme-0-Scheme-10) for a bilateral-symmetric multi-slot fishway (i.e. BMSF-R11 in the literature). Numerical results indicate that Scheme-2, Scheme-8, Scheme-9, and Scheme-10 can eliminate the mainstream’s adherence to sidewalls and ensure that the mainstream always lies in the middle region of the 90° - turning pool, which are deemed as favourable flow regime for upstream-migrating fish. Moreover, by alternately arranging five short baffles, three guide walls and one flow-splitting pier, Scheme-8, Scheme-9 and Scheme-10 can effectively reduce the size of the recirculation region in the 90°-turning pool, which is beneficial to avoiding the previously observed delay and inhibition of fish-passing. In addition, among all the eleven layouts, Scheme-8 and Scheme-9 generate the overall lowest velocity magnitude and turbulent level, being conducive to the upstream migration of moderate-swimming and weak-swimming fishes. Meanwhile, Scheme-9 can provide sufficient resting areas for upstream-migrating fish, with 30%–50% of the volume having the velocity magnitude less than 0.3 m/s, but Scheme-8 fails to meet this requirement. Due to its relatively good flow regime and hydrodynamic performance, Scheme-9 is ultimately recommended for the BMSF-R11 90° - turning pool. Fish passage experiments with live fish will be performed in the future to examine the actual passage efficiency of Scheme-9.</p>

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A novel right-angle-turning pool design for fishways

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • Di Zhang,
  • Yu-zhi Li,
  • Chen Zhang,
  • Dongfang Liang,
  • Liang Cheng,
  • Ya-kun Liu

摘要

Turning pools contribute to creating a more compact fishway design, alleviating the topographic constraint and optimizing the entrance location. Up to now, the hydrodynamic optimization of turning pools has failed to receive adequate attention. By conducting 3-D numerical simulations, this study proposes and compares eleven 90°-turning pool configurations (i.e. Scheme-0-Scheme-10) for a bilateral-symmetric multi-slot fishway (i.e. BMSF-R11 in the literature). Numerical results indicate that Scheme-2, Scheme-8, Scheme-9, and Scheme-10 can eliminate the mainstream’s adherence to sidewalls and ensure that the mainstream always lies in the middle region of the 90° - turning pool, which are deemed as favourable flow regime for upstream-migrating fish. Moreover, by alternately arranging five short baffles, three guide walls and one flow-splitting pier, Scheme-8, Scheme-9 and Scheme-10 can effectively reduce the size of the recirculation region in the 90°-turning pool, which is beneficial to avoiding the previously observed delay and inhibition of fish-passing. In addition, among all the eleven layouts, Scheme-8 and Scheme-9 generate the overall lowest velocity magnitude and turbulent level, being conducive to the upstream migration of moderate-swimming and weak-swimming fishes. Meanwhile, Scheme-9 can provide sufficient resting areas for upstream-migrating fish, with 30%–50% of the volume having the velocity magnitude less than 0.3 m/s, but Scheme-8 fails to meet this requirement. Due to its relatively good flow regime and hydrodynamic performance, Scheme-9 is ultimately recommended for the BMSF-R11 90° - turning pool. Fish passage experiments with live fish will be performed in the future to examine the actual passage efficiency of Scheme-9.