한강 최종방류수의 수질 및 물질 방류량의 장기변동 연구 = Long-term Variations of Water Quality and Material Flux in the Han River, Korea

다국어 초록 (Multilingual Abstract)

The Han River discharges 18×109 tones of freshwater per year into the Yellow Sea, and its variation of water quality influences its estuary. In order to analyze the direct effect of the long-term variations of the water quality and material flux on the ecosystem of the Han River’s estuary, we collected water quality data(e.g., water temperature, dissolved oxygen, COD, nitrogen, phosphorus, suspended solids(SS), and chlorophyll-α) for 23 years(1994~2017). Discharge from the Han River into the Yellow Sea was influenced by rainfall of the watershed of the river based on positive relation between the discharge and amount of rainfall, but the discharge has been seasonally regulated by dams constructed in up- and mid-stream. Phosphate and ammonia concentrations showed a decline while nitrate concentrations consistently increased. COD and SS displayed a decline before the dam construction in 2013 but increased afterwards. On the contrary, DO consistently increased before dam construction in 2013 but decreased afterwards. Change in water quality by river discharge was distinct when river discharge was minimal.This resulted in distinct seasonal change. The flux of COD, chlorophyll-α, ammonia and phosphate decreased, but SS flux increased after 2013 which means that the flux of organic matter and nutrients decreased when the SS flux increased.

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