영산강 유역 하상퇴적물의 지화학적 특성과 환경 변화
The Geochemical Characteristics and Environmental Changes of Surface Sediments in Yeongsan River Area
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Considering the sedimentological setting and changes of fluvial environments in Yeongsan river area, this study investigated the depositional and geochemical characteristics of the river. In addition, the present study results were compared to the previous ones by Oh(2002). The channel deposits of the river were composed mainly of gravels in the upper stream, sands in the midstream, and silts and clays in the downstream. The deposits were strongly correlated with the mean grain size, Al content, and total organic carbon (TOC) (r values > 0.7). Also, the geochemical elements in the deposits appeared to be controlled by fining of sediments, surrounding geology, and organic matters like TOC. With regard to metallic Enrichment Factor, Li (1.96), Zn (1.13), and Pb (2.19) were enriched in the deposits; however, P was enriched in some limited areas only. According to the findings by Oh(2002), content changes were recognized in elements of Al, Fe, Mg, Ca, Na, K, Ba, Cu, Ni, Sr, and Pb. Therefore, it is considered that grain size fining of the deposits controls the geochemical behaviors of the above-mentioned elements and that organic matters partly influence behaviors.
Abstract
Considering the sedimentological setting and changes of fluvial environments in Yeongsan river area, this study investigated the depositional and geochemical characteristics of the river. In addition, the present study results were compared to the previous ones by Oh(2002). The channel deposits of the river were composed mainly of gravels in the upper stream, sands in the midstream, and silts and clays in the downstream. The deposits were strongly correlated with the mean grain size, Al content, and total organic carbon (TOC) (r values > 0.7). Also, the geochemical elements in the deposits appeared to be controlled by fining of sediments, surrounding geology, and organic matters like TOC. With regard to metallic Enrichment Factor, Li (1.96), Zn (1.13), and Pb (2.19) were enriched in the deposits; however, P was enriched in some limited areas only. According to the findings by Oh(2002), content changes were recognized in elements of Al, Fe, Mg, Ca, Na, K, Ba, Cu, Ni, Sr, and Pb. Therefore, it is considered that grain size fining of the deposits controls the geochemical behaviors of the above-mentioned elements and that organic matters partly influence behaviors.
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