THE HYDRAULICS OF NATURE-LIKE FISHWAYS

Authors

  • Xi Mao Sichuan Agricultural University
  • Sheng Huang
  • Yuchen Xu
  • Zhong Cheng
  • Jiehao Zhang

DOI:

https://doi.org/10.14311/CEJ.2021.04.0063

Abstract

Nature-like fishway arrangements are commonly used because these structures imitate the characteristics of natural rivers and effectively allow fish to migrate past river sections blocked by hydraulic structures. In this paper, physical models were analyzed, and the velocity distributions of two different fishway structures (Types I and II) were compared. Results showed that the maximum mainstream velocity of the Type I structure was 5.3% lower than that of the Type II structure. However, the average mainstream velocity of the Type I structure was 21.1% greater than that of the Type II structure. The total per-cycle length of the mainstream path in the Type II structure was 2.1 times greater than that of the Type I structure, which indicated that the length of the mainstream path was somewhat proportional to the average velocity of the mainstream. When the flow rate was kept constant, increases in the velocity of the main flow associated with changes in the internal structure of the fishway decreased the average velocity of the main flow, while decreases in the total length of the flow path led to increases in the average velocity of the main flow. Due to frictional head loss along the fishway and local head loss, as well as the overlaps between these factors, the overall flow rate gradually decreased every cycle, despite periodic fluctuations.

References

Mao X, Li J, An R, Zhao W, Li K., Li R, Deng Y, Liang X., Yang M, Zhang J., Tang K., 2019. Study of key technologies for fishways in the plateaus of western China. Global Ecology and Conservation, vol. 20, e00755.

Mao X., 2018. Review of fishway research in China. Ecological Engineering, vol. 115: 91-95.

Nyqvist D, Elghagen J, Heiss M, Calles O., 2018. An angled rack with a bypass and a nature-like

fishway pass Atlantic salmon smolts downstream at a hydropower dam. Marine and Freshwater Research, vol. 69(12): 1894-1894.

Gustafsson S., 2012. Macroinvertebrate colonization of a nature-like fishway : The effects of habitat design. Ecological Engineering, vol. 61(19): 345-353.

Li G, Sun S, Zhang C, Liu H, Zheng T., 2019. Evaluation of flow patterns in vertical slot fishways with different slot positions based on a comparison passage experiment for juvenile grass carp. Ecological Engineering, vol. 133: 148-159.

Tamario C, Degerman E, Donadi S, Spjut D, Sandin L., 2018. Nature‐ like fishways as compensatory lotic habitats. River Research and Applications, vol. 34(3): 253-261.

Muraoka K, Nakanishi S, Kayaba Y., 2017. Boulder arrangement on a rocky ramp fishway based on the swimming behavior of fish. Limnologica - Ecology and Management of Inland Waters, vol. 62: 188-193.

Li S, Ding X, Liu D., 2014. Review of natural-like fishway. Yangtze River, vol. 96: 70-73. (in Chinese)

State Key Laboratory of Hydraulics and Mountainous River Development and Protection, Sichuan

University, 2016. Hydraulics(5th edition)( Volume one) 533 pp. (in Chinese)

Chen K, Tao J, Chang Z, Cao X, Ge H., 2014. Difficulties and prospects of fishways in China: An overview of the construction status and operation practice since 2000. Ecological Engineering, vol. 70: 82- 91.

Mao X, Zhang J, Tang K, Zhao W., 2019. Designs for T shape fishways. The Civil Engineering Journal 2019, vol. 28 no. 2: 270-280.

Larinier M, Travade F, Porcher J., 2002. Fishways: biological basis, design criteria and monitoring.

Downloads

Published

2021-12-31

How to Cite

Mao, X., Huang, S., Xu, Y., Cheng, Z., & Zhang, J. (2021). THE HYDRAULICS OF NATURE-LIKE FISHWAYS. Stavební Obzor - Civil Engineering Journal, 30(4). https://doi.org/10.14311/CEJ.2021.04.0063

Issue

Section

Articles