ORIGINAL RESEARCH
Middle-Stream Weir Gate Openings Partially
Neutralize the Impacts of Nutrients Over
Algal Primary Productivity in a Large
Managed River of South Korea
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National Ecosystem Survey, National Institute of Ecology (NIE), Seocheon, 33657, Republic of Korea
Submission date: 2024-02-25
Final revision date: 2024-05-11
Acceptance date: 2024-07-24
Online publication date: 2024-12-18
Publication date: 2025-07-22
Corresponding author
Hong-Suk Koh
National Ecosystem Surveys and Research Team, National Institute of Ecology, Maseomyeon Geumgang ro 1210, 33607, Seocheon, Korea (South)
Pol. J. Environ. Stud. 2025;34(5):5607-5625
KEYWORDS
TOPICS
ABSTRACT
The influence of opening river weir gates on algal biomass – nutrient relationships on a large
scale has been understudied in the fluvial ecosystem. The 5 waterbodies (weir impoundments
and dam reservoirs) formed by 3 middle-stream weirs, 1 estuary dam, and 1 upstream dam, all of
which are in the same main stem of the third largest river (Geum River) in South Korea, were compared
quantitatively between the closed and opened periods of weir gates in chlorophyll a (Chl) responses
to total phosphorus (TP). Regardless of whether weir gates were opened or closed, weir impoundments
had a higher Chl:TP ratio than dam reservoirs did. However, the opened gate period, irrespective of
waterbody type, had a lower Chl:TP ratio than the closed gate period did. These results corroborated
that, after weir gate openings, algal biomass accruals were somewhat limited because of increases
in flow rates and reductions in hydraulic residence time, but a significant reduction in the Chl:TP ratio
was not displayed. Furthermore, the Chl:TP ratio differed among weir impoundments, likely because
of bottom topographical heterogeneity caused by declines in water levels. Long-term and periodic
monitoring of the algal responses to P varying with river hydrology as well as basin morphometry
is required to verify whether the possibility of algal biomass accruals following weir gate openings
has significantly become attenuated.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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