논문
Downstream Transport of Geosmin Based on Harmful Cyanobacterial Outbreak Upstream in a Reservoir Cascade
학술지
In`t J of Environmental Research and Public Health
저자
신재기
발표일
20220729
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
Kutz 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.
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
Kutz 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.