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Response of Fish Habitat Quality to Weir Distribution Change in Mountainous River Based on the Two-Dimensional Habitat Suitability Model

Author

Listed:
  • Yue Wang

    (College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China)

  • Jihong Xia

    (College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China)

  • Wangwei Cai

    (College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China)

  • Zewen Liu

    (College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China)

  • Jingjiang Li

    (College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China)

  • Jingyun Yin

    (College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China)

  • Jiayi Zu

    (College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China)

  • Chuanbin Dou

    (College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China)

Abstract

Weirs are often constructed on mountainous rivers because of their low construction costs and their ability to provide irrigation and facilitate landscaping, yet there is little research on how fish habitat quality in mountainous rivers responds to weir distribution. This study categorized the distribution characteristics of weirs on typical reaches according to their sinuosity and calculated the corresponding habitat suitability index ( HSI ) and weighted usable area ( WUA ) under various discharge conditions using a coupled MIKE21 and habitat suitability model. Then, the relationship between the distribution characteristics of weirs and the quality of fish habitats under different discharge conditions was analyzed. The results show that weirs in mountainous rivers can affect the habitat suitability of the rivers, but this effect is closely related to discharge conditions and layout mainly because the key hydraulic factors that determine habitat quality for different sinuous reaches vary under different discharge conditions. This study found that in high-sinuosity rivers with high discharge conditions, water depth is the key factor determining the quality of fish habitats, so weirs can improve habitat quality by improving the suitability of downstream water depth. However, in other conditions, velocity is the key factor determining habitat quality, in which case weirs cannot improve habitat quality and can even degrade it. Therefore, other methods of improving velocity are needed to enhance habitat quality. The results of this study provide a reference for the protection of fish habitats in mountainous river channels and the determination of suitable locations for weir construction.

Suggested Citation

  • Yue Wang & Jihong Xia & Wangwei Cai & Zewen Liu & Jingjiang Li & Jingyun Yin & Jiayi Zu & Chuanbin Dou, 2023. "Response of Fish Habitat Quality to Weir Distribution Change in Mountainous River Based on the Two-Dimensional Habitat Suitability Model," Sustainability, MDPI, vol. 15(11), pages 1-17, May.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:11:p:8698-:d:1157592
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    References listed on IDEAS

    as
    1. Yi, Yujun & Cheng, Xi & Yang, Zhifeng & Wieprecht, Silke & Zhang, Shanghong & Wu, Yingjie, 2017. "Evaluating the ecological influence of hydraulic projects: A review of aquatic habitat suitability models," Renewable and Sustainable Energy Reviews, Elsevier, vol. 68(P1), pages 748-762.
    2. Meixler, Marcia S. & Bain, Mark B. & Todd Walter, M., 2009. "Predicting barrier passage and habitat suitability for migratory fish species," Ecological Modelling, Elsevier, vol. 220(20), pages 2782-2791.
    3. Christoph Hauer & Günther Unfer & Hubert Holzmann & Stefan Schmutz & Helmut Habersack, 2013. "The impact of discharge change on physical instream habitats and its response to river morphology," Climatic Change, Springer, vol. 116(3), pages 827-850, February.
    4. Wang, Fei & Lin, Binliang, 2013. "Modelling habitat suitability for fish in the fluvial and lacustrine regions of a new Eco-City," Ecological Modelling, Elsevier, vol. 267(C), pages 115-126.
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