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http://dx.doi.org/10.11614/KSL.2017.50.1.029

Rainfall and Hydrological Comparative Analysis of Water Quality Variability in Euiam Reservoir, the North-Han River, Korea  

Hwang, Soon-Jin (Department of Environmental Health Science, Konkuk University)
Sim, Yeon Bo (Han River Environment Research Center, National Institute of Environmental Research)
Choi, Bong-Geun (Department of Environmental Health Science, Konkuk University)
Kim, Keonhee (Department of Environmental Health Science, Konkuk University)
Park, Chaehong (Department of Environmental Health Science, Konkuk University)
Seo, Wanbum (Department of Environmental Health Science, Konkuk University)
Park, Myung-Hwan (Department of Environmental Health Science, Konkuk University)
Lee, Su-Woong (Han River Environment Research Center, National Institute of Environmental Research)
Shin, Jae-Ki (Office for Southern Region Management of the Nakdong River, Korea Water Resources Corporation (K-water))
Publication Information
Korean Journal of Ecology and Environment / v.50, no.1, 2017 , pp. 29-45 More about this Journal
Abstract
This study explored spatiotemporal variability of water quality in correspondence with hydro-meteorological factors in the four stations of Euiam Reservoir located in the upstream region of the North-Han River from May 2012 to December 2015. Seasonal effect was apparent in the variation of water temperature, DO, electric conductivity and TSS during the study period. Stratification in the water column was observed in the near dam site every year and vanished between August and October. Increase of nitrogen nutrients was observed when inflowing discharge was low, while phosphorus increase was distinct both during the early season with increase of inflowing discharge and the period of severe draught persistent. Duration persisting high concentration of Chl-a (>$25mg\;m^{-3}$: the eutrophic status criterion, OECD, 1982) was 1~2 months of the whole year in 2014~2015, while it was almost 4 months in 2013. Water quality of Euiam Reservoir appeared to be affected basically by geomorphology and source of pollutants, such as longitudinally linked instream islands and Aggregate Island, inflowing urban stream, and wastewater treatment plant discharge. While inflowing discharge from the dams upstream and outflow pattern causing water level change seem to largely govern the variability of water quality in this particular system. In the process of spatiotemporal water quality change, factors related to climate (e.g. flood, typhoon, abruptly high rainfall, scorching heat of summer), hydrology (amount of flow and water level) might be attributed to water pulse, dilution, backflow, uptake, and sedimentation. This study showed that change of water quality in Euiam Reservoir was very dynamic and suggested that its effect could be delivered to downstream (Cheongpyeong and Paldang Reservoirs) through year-round discharge for hydropower generation.
Keywords
water quality; variability; climate; rainfall; hydrology; chlorophyll-a; Euiam Reservoir;
Citations & Related Records
Times Cited By KSCI : 17  (Citation Analysis)
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