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Effects of Weir Construction on Phytoplankton Assemblages and Water Quality in a Large River System

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  • Hae-Jin Lee

    (Nakdong River Environment Research Center, National Institute of Environmental Research, Goryeong 40103, Korea)

  • Hae-Kyung Park

    (Nakdong River Environment Research Center, National Institute of Environmental Research, Goryeong 40103, Korea)

  • Se-Uk Cheon

    (Geum River Environment Research Center, National Institute of Environmental Research, Okcheon 29027, Korea)

Abstract

Flow regulation is one of the most common anthropogenic factors affecting rivers worldwide. In Korea, 16 weirs were constructed along four major rivers from 2009 to 2012. This study aimed to elucidate initial changes in physical, chemical, and biological variables after the construction of consecutive weirs on the Nakdong River, a major large river system. Water quality variables and phytoplankton cell densities were investigated at eight representative sites and compared with the data recorded before the weir construction. There were spatial and temporal changes in the hydraulic retention time (HRT), total phosphorus (TP), and chlorophyll a concentrations among the eight weir sections. HRT increased after the weir construction, while TP and chlorophyll a tended to decrease from the middle to lower section of the Nakdong River. Furthermore, differences were observed in the phytoplankton community composition between 2006–2007 and 2013. There was a marginal decrease in the duration of centric diatom ( Stephanodiscus hantzschii ) blooms after weir construction. However, Microcystis aeruginosa proliferated more extensively during summer and autumn than it did before the weir construction. Our results suggest that changes in hydrological factors, in response to consecutive weir construction, may contribute to greater physical, chemical, and ecological variability.

Suggested Citation

  • Hae-Jin Lee & Hae-Kyung Park & Se-Uk Cheon, 2018. "Effects of Weir Construction on Phytoplankton Assemblages and Water Quality in a Large River System," IJERPH, MDPI, vol. 15(11), pages 1-14, October.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:11:p:2348-:d:178021
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    References listed on IDEAS

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    1. Christoph Humborg & Venugopalan Ittekkot & Adriana Cociasu & Bodo v. Bodungen, 1997. "Effect of Danube River dam on Black Sea biogeochemistry and ecosystem structure," Nature, Nature, vol. 386(6623), pages 385-388, March.
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    Cited by:

    1. Namsrai Jargal & Ho-Seong Lee & Kwang-Guk An, 2021. "Long-Term Water Quality Patterns in an Estuarine Reservoir and the Functional Changes in Relations of Trophic State Variables Depending on the Construction of Serial Weirs in Upstream Reaches," IJERPH, MDPI, vol. 18(23), pages 1-17, November.
    2. Jongchan Kim & Andreja Jonoski & Dimitri P. Solomatine & Peter L. M. Goethals, 2023. "Decision Support Framework for Optimal Reservoir Operation to Mitigate Cyanobacterial Blooms in Rivers," Sustainability, MDPI, vol. 15(17), pages 1-28, August.

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