Journal of Environmental Impact Assessment (환경영향평가)

Korean Society of Environmental Impact Assessment (한국환경영향평가학회)
권호 표지

Analysis of Origin Matter of Blackish Water in Dam Reservoir During Winter

동절기 댐저수지 수색변동에 영향을 미치는 인자 및 원인물질 분석

  • Lee, Yosang (Dept. of Environmental Engineering, Seoul National Univ. of Technology) ;
  • Shin, Hyun Sang (Dept. of Environmental Engineering, Seoul National Univ. of Technology) ;
  • Yi, Hye Suk (Korea Institute of Water and Environment, K-WATER) ;
  • Park, Jae-Chung (Water Resources Planning Dept., K-water)
  • 이요상 (서울산업대학교 환경공학과) ;
  • 신현상 (서울산업대학교 환경공학과) ;
  • 이혜숙 (한국수자원공사 수자원연구원) ;
  • 박재충 (한국수자원공사 수자원기획처)
  • Received : 2006.08.01
  • Accepted : 2006.02.07
  • Published : 2007.02.28
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Abstract

This study has been conducted to assess blackish-water phenomena in Dam reservoir. To searching for the reason, we survey physical changes in reservoir and analyze metal and organic content in particulate materials and water. The blackish-water phenomena in lake A are occurred with turbidity increases in turnover season irregularly. It was reported on 6 Jan. 2005 weakly and the water column mixed with 35~40m depth and water temperature shows $7^{\circ}C$. The turbidity of AD and AM site increased up to 20NTU. Especially, AN site shows 27NTU, such a result makes that Dam manager conclude it to blackish-water phenomena. The results of sequential extraction analysis show that over 80% of Al, Cr and Fe is existed in residual form in sediment. On the other hand, the most part of Mn shows exchangeable and carbonates form, which have a good possibility of release to water column. Mn contents in pore waters of the sediment samples are also found to be ~4 times higher than Fe contents. The metal contents in pore water of different dam sites are in order of AN (Fe: 9.98, Mn: 40.6) > AD(8.33, 37.5) > DD(1.91, 2.55). According to the results of extracted organic materials from sediment, humic substances is occupied with over 85% in total organic carbon including 23~45% of humic acid (HA) and 0.9~8.5% of fulvic acid (FA). However, HA content in pore water is not detectable while FA contents, acid-soluble humic fractions is higher than that of sediment(10~15%). which indicating that FA is a main humic components affecting water color. The color unit per DOC of FA in pore waters of different dam sites are found to be higher in lake A than lake D. From the results, it could be suggested that blackish-water phenomena of lake A are mainly arise from higher concentration of Mn and water soluble organic fractions (e.g., FA) released from sediments as well as the strength of turnover in Dam reservoir.

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References

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