Hydro-meteorological Effects on Water Quality Variability in Paldang Reservoir, Confluent Area of the South-Han River-North-Han River-Gyeongan Stream, Korea

Hwang, Soon‐Jin; Kim, Keon-Hee; Park, Chaehong; Seo, Wanbum; Choi, Bong-Geun; Eum, Hyun Soo; Park, Myung-Hwan; Noh, Hye Ran; Sim, Yeon Bo; Shin, Jae-Ki

doi:10.11614/ksl.2016.49.4.354

Cited by 11 publications

(11 citation statements)

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“…Since the initial impoundment in 1968, severe blooms caused by harmful cyanobacteria ( Dolichospermum circinale ) and their negative impacts have continuously persisted in the Gongji Stream river mouth near the discharge port for the treated wastewater of the Chuncheon wastewater treatment plant (WWTP) [ 35 , 36 , 37 , 38 , 39 ]. Consequently, a potential exists for GSM production that can affect not only Euiam Reservoir but also the downstream Cheongpyeong and Paldang Reservoirs, depending on the occurrence pattern of D. circinale [ 37 , 40 , 41 , 42 ].…”

Section: Methodsmentioning

confidence: 99%

Downstream Transport of Geosmin Based on Harmful Cyanobacterial Outbreak Upstream in a Reservoir Cascade

Shin

Park

Kim

et al. 2022

IJERPH

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Understanding water quality events in a multiple-impoundment series is important but seldom presented comprehensively. Therefore, this study was conducted to systematically understand the explosion event of geosmin (GSM) in the North Han River (Chuncheon, Soyang, Euiam, and Cheongpyeong Reservoirs) and Han River (Paldang Reservoir), which consists of a cascade reservoir series, the largest drinking water source system in South Korea. We investigated the spatiotemporal relationship of harmful cyanobacterial blooms in the upstream reservoir (Euiam) with the water quality incident event caused by the GSM in the downstream reservoir (Paldang) from January to December 2011. The harmful cyanobacterial bloom occurred during August–September under a high water temperature (>20 °C) after a heavy-rainfall-based flood runoff event. The high chlorophyll-a (Chl-a) concentration in the upper Euiam Reservoir was prolonged for two months with a maximum concentration of 1150.5 mg m−3, in which the filamentous Dolichospermum circinale Kütz dominated the algal community at a rate of >99%. These parameters remarkably decreased (17.3 mg Chl-a m−3) in October 2011 when the water temperature decreased (5 °C) and soluble reactive phosphorus was depleted. However, high and unprecedented GSM concentrations, with a maximum value of 1640 ng L−1, were detected in the downstream reservoirs (Cheongpyeong and Paldang); the level was 11 times higher than the value (10 ng L−1) recommended by the World Health Organization. The concentrations of GSM gradually decreased and had an adverse effect on the drinking water quality until the end of December 2011. Our study indicated that the time lag between the summer–fall cyanobacterial outbreak in the upstream reservoir and winter GSM explosion events in the downstream reservoirs could be attributed to the transport and release of GSM through the effluent from hydroelectric power generation in this multiple-reservoir system. Therefore, we suggest that a structural understanding of the reservoir cascade be considered during water quality management of drinking water sources to avoid such incidents in the future.

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Section: Methodsmentioning

confidence: 99%

Downstream Transport of Geosmin Based on Harmful Cyanobacterial Outbreak Upstream in a Reservoir Cascade

Shin

Park

Kim

et al. 2022

IJERPH

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“…Therefore, it is not enough to analyze the flow and water quality characteristics of the Paldang reservoir based solely on existing weekly or monthly data. Previous studies [35,38,40,41] analyzed the relationship between flow and water quality based on the hydrological parameters (i.e., water level, precipitation, inflow, discharge, and hydraulic retention time) of the entire waterbody and the weekly or monthly water quality data measurements. As a result, the sub-daily dynamic flow characteristics of the Paldang reservoir and the resulting spatial variability in water quality have been overlooked.…”

Section: Field Monitoringmentioning

confidence: 99%

“…The area affected by algal bloom (overgrowth of harmful cyanobacteria including Microcystis sp., Anabaena sp., Oscillatoria sp., Aphanizomenon sp. ), in the Paldang reservoir is closely related to the hydraulic flow characteristics formed by the influent density flows and the thermal stratification of the reservoir [38,40]. When nutrients flow from the Gyeongancheon branch and the NH-and SH-rivers, algae grows through photosynthesis in the congested waters at the confluence and are transported into the Paldang reservoir.…”

Section: Local Retention Time (Water Age) and Water Quality Impactmentioning

confidence: 99%

“…In addition, previous studies [38][39][40][41][42] have reported that hypoxia occurs temporarily or long-term at the bottom of the Paldang reservoir. The hypoxia occurs due to hydraulic and hydrological conditions such as rainfall, inflow, and discharge.…”

Section: Local Retention Time (Water Age) and Water Quality Impactmentioning

confidence: 99%

“…In addition, due to the operating characteristics of the ROR reservoir and the geographic structure resulting from rapidly increasing width and depth near the bends where the two main rivers converge, the variability in hydraulic and water quality properties is even greater [27,35,36]. Consequently, spatial distribution characteristics of water quality in Paldang reservoir are closely related to physical mixing characteristics [37][38][39][40][41][42]. The purpose of this study was to characterize the mixing and circulation of three rivers with different physicochemical properties into the Paldang reservoir, using high-frequency monitoring and 3D hydrodynamic modeling.…”

Section: Introductionmentioning

confidence: 99%

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Characterizing Density Flow Regimes of Three Rivers with Different Physicochemical Properties in a Run-Of-The-River Reservoir

Ryu

Chung

2020

Water

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Inflow mixing affects the spatiotemporal heterogeneity of water quality in reservoirs. Reservoir water quality management requires accurate prediction of density flow regimes to understand the spatiotemporal distribution of dissolved and particulate nutrients and organics. This study aims to characterize the mixing and circulation of three rivers with different physicochemical properties in a run-of-the-river (ROR) reservoir, using high-frequency monitoring and three-dimensional (3D) hydrodynamic modeling. The Aquatic Ecosystem Model (AEM3D) was constructed for the reservoir and calibrated with high-frequency data obtained from May–June 2016, accurately reproducing the observed spatiotemporal variations of flow velocity, water temperature, and electrical conductivity (EC) in the reservoir. High-frequency data and 3D model results showed that mixing of the rivers in the ROR reservoir is governed by density flow regimes formed by influent water temperature differences. At the confluence, colder and warmer river influents formed underflows and surface buoyant overflows, respectively. The spatial arrangement of flow direction, water residence time, and EC concentration were largely controlled by the buoyancy-driven flow. Stagnant areas with long residence times corresponded with areas of observed algal blooms and hypoxia. High-frequency sensor technology, combined with 3D hydrodynamic modeling, is effective for understanding the complex flow regimes and associated water quality characteristics in ROR-type reservoirs.

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Spatiotemporal and Longitudinal Variability of Hydro-meteorology, Basic Water Quality and Dominant Algal Assemblages in the Eight Weir Pools of Regulated River (Nakdong)

Shin¹,

Park²

2018

Korean J. Ecology and Environment.

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Hydro-meteorological Effects on Water Quality Variability in Paldang Reservoir, Confluent Area of the South-Han River-North-Han River-Gyeongan Stream, Korea

Cited by 11 publications

References 0 publications

Downstream Transport of Geosmin Based on Harmful Cyanobacterial Outbreak Upstream in a Reservoir Cascade

Downstream Transport of Geosmin Based on Harmful Cyanobacterial Outbreak Upstream in a Reservoir Cascade

Characterizing Density Flow Regimes of Three Rivers with Different Physicochemical Properties in a Run-Of-The-River Reservoir

Spatiotemporal and Longitudinal Variability of Hydro-meteorology, Basic Water Quality and Dominant Algal Assemblages in the Eight Weir Pools of Regulated River (Nakdong)

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