Five sampling sites at the Gap Stream, a major tributary flowing into the Geum River, were classified according to their locations on the left or right banks of the latter; this was to allow an assessment of the pollution level in the river. To this end, the water quality and the sediments were examined twice -in the first and the second half of the year and before and after the rainy season. In terms of water quality, the concentration of nutrients increased during the second half of the testing period at sites G3 to G5, which are located just before the confluence of the stream and the river. The assessment results also showed that site G5-R required particular attention because of water pollution due to a frequent inflow of contaminants via surface sediments, in the second half of the study period after rainfall, when the WQI(Water Quality Index) was applied. In terms of the sediments, there was no site corresponding to Class IV or “heavily polluted”, according to the standards of the National Academy of Environmental Research. However, in the first half of the year, sites G4 and G5 on the left bank were polluted at LEL-SEL levels, which, according to the Ontario standards and the Org-Index assessment, indicated that they were “moderately polluted” or worse, indicating a concern regarding pollution from organic matter and nutrients.

/pdf/assessment-of-water-quality-and-sediment-pollution-in-gap-2ayl506j5f.pdf

Assessment of Water Quality and Sediment Pollution in Gap Stream

Shin Kim, Dalrae Jin, Hyeyun Lee, Kwonchul Lee, Hyungi Jeong, Heongak Kwon, Yongseok Kim, and Deukseok Yang Nakdong River Environmetal Research Center, National Institute of Environmental Research, 24, Pyeongri-1gil, Goryeong-gun, Gyeongsangbuk-do, Korea Water Environment Research Department, Water Environmental Engineering Research Division, National Institute of Environmental Research, 42, Hwangyeong-ro, Su-gu, Incheon, Korea

/pdf/transformation-of-physico-chemical-characteristics-in-the-eo2ozs8pux.pdf

Transformation of Physico-chemical Characteristics in the Sediments of the Jinyang Lake

The objective of this study was to investigate the pollution assessment of organic matters, nutrients, and metals in sediment in major lakes (5 lakes and 17 sites) of Buk-han river using various sediment pollution assessment guidelines and indices. The concentrations of organic matters and nutrients were lower than class IV (Sediment pollution assessment guidelines of Korea) and Severe Effect Level (SEL, Sediment pollution assessment guidelines of Ontario). This results indicated that the lakes sediments were unpolluted and tolerable level for sediment dwelling organisms by organic matters and nutrients. However, several sites of Chuncheon and Soyang lakes were evaluated “heavily polluted” level by organic index (Org-index). The order of lakes by metals concentrations from the one with the highest concentration was Hwacheon, Chuncheon, Cheongpyeong, Uiam, Soyang. All lakes except Hwacheon were assessed unpolluted to marginally and tolerable level for sediment dwelling organisms by metals based on sediment pollution assessment guidelines (Korean and Ontario), indices of geoaccumulation (Igeo), pollution loading (PLI) and ecological risk (RI). In Lake Hwacheon, every investigated sites were polluted with metals, especially Hg, based on sediment pollution assessment guideline of Korea and indices (Igeo, PLI and RI). The dwelling organisms in sediment of Hwacheon Lake were likely to be severed by metals.

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