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Numerical studies on ecological effects of artificial mixing of surface and bottom waters in density stratification in semi-enclosed bay and open sea

Author

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  • Mizumukai, Kentaro
  • Sato, Toru
  • Tabeta, Sigeru
  • Kitazawa, Daisuke

Abstract

An apparatus, which mixes waters in upper and lower layers in density stratification and discharges the mixture at the middle depth, has made a remarkable success in enhancing water quality for ecosystems in a small semi-enclosed bay. In this study, we conducted numerical simulations by using a three-dimensional tidal current model and an ecosystem model to predict the effects of the apparatus in two different seas; a larger semi-enclosed bay and the area around a solitary island in the open sea. Isahaya Bay in Ariake Sea was chosen as the former case to see how effectively the apparatus can reduce oxygen-deficient water, and the sea around Okinotori-shima Island represents the latter, where we are interested in the effect of the apparatus on fertilisation; how much primary production can be increased. As a result, it is suggested that the apparatus reduced up to 70% of oxygen-deficient water in Isahaya Bay during the neap tide in high summer, although it is not very effective in fertilising around the solitary island; only 0.3% of chlorophyll-a was increased in the area affected by the apparatus.

Suggested Citation

  • Mizumukai, Kentaro & Sato, Toru & Tabeta, Sigeru & Kitazawa, Daisuke, 2008. "Numerical studies on ecological effects of artificial mixing of surface and bottom waters in density stratification in semi-enclosed bay and open sea," Ecological Modelling, Elsevier, vol. 214(2), pages 251-270.
    • Handle: RePEc:eee:ecomod:v:214:y:2008:i:2:p:251-270
    DOI: 10.1016/j.ecolmodel.2008.02.023
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    Citations

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    Cited by:

    1. Junbo Zhang & Daisuke Kitazawa & Chenxing Yang, 2016. "A numerical modeling approach to support decision-making on design of integrated multitrophic aquaculture for efficiently mitigating aquatic waste," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 21(8), pages 1247-1261, December.
    2. Zhang, Dahai & Fan, Wei & Yang, Jing & Pan, Yiwen & Chen, Ying & Huang, Haocai & Chen, Jiawang, 2016. "Reviews of power supply and environmental energy conversions for artificial upwelling," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 659-668.
    3. Tabeta, Shigeru & Suzuki, Shota & Nakamura, Yoshiharu, 2015. "Combined modeling of fish behavior and fishing operations for conger eel fishery in Ise Bay," Ecological Modelling, Elsevier, vol. 313(C), pages 266-275.

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