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The hydrogeochemistry of the wujiang River drainage system in Guizhou, China (Ⅱ)——Variations in concentrations of dissolved trace elements in karst river water and their controlling factors

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Chinese Science Bulletin 1999年第S2期44卷 112-115页

作者： LIU Congqiang and HAN Guilin State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

GEOCHEMICAL studies of trace elements, especially heavy metal elements in river water will provide thegrounds for the assessment of the influence of human activities on the environment. At present, the stud- ies of water bodies in karst areas are focussed on the analysis of chemical compositions of surface and underground water samples, and almost no systematic study has been done on trace elements. So theauthors have carried out systematic studies on the distribution of concentrations of the dissolved trace elements and their controlling factors, while some systematic studies are under way on the major compositionsof river water in the wujiang drainage system in Guizhou Province. On the basis of the characteristics ofthe U-Ca-Sr system in river water and their geochemical indicating implications (Refer to the paper entitled "The hydrogeochemistry of the wujiang River drainage system in Guizhou, China: I. The U-Ca-Srsystem in karst river water"), the paper is concerned mainly with the trace element composition of

关键词： dissolved trace elements karst wujiang River drainage system Guizhou China.

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Impacts of river impoundment on the riverine water chemistry composition and their response to chemical weathering rate

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Frontiers of Earth Science 2013年第3期7卷 351-360页

作者： Yang GAO Baoli WANG Xiaolong LIU Yuchun WANG Jing ZHANG Yanxing JIANG School of Environmental and Chemical Engineering Shanghai University Shanghai 200444 China Institute of Geochemistry Chinese Academy of Science Guiyang 550002 China Tianjin Normal University Tianjin 300387 China Department of Water Environment China Institute of Water Resources and Hydroelectric Power Research (IWHR) Beijing 100038 China

Currently, most rivers worldwide have been intensively impounded. River damming becomes a big problem, not only in inducing the physical obstruction between upstream and downstream, but also in destroying the natural continuity of river. But the discontinuity of water quality was often neglected, which presents a challenge to traditional river geochemistry research. To understand the changes in basic chemistry of water upstream and downstream of the dam, we investigated the Miaotiao River reservoirs in series in the wujiang River Basin, and the Hongjiadu, Dongfeng Reservoir on the upper reaches of the wujiang River. Chemical weathering rates were calculated using the water chemistry data of the reservoir surface and downstream of the dam, in each reservoir, respectively. The results showed that the difference between the chemical weathering rates calculated from reservoir surface water and water downstream of the dam was greater in reservoirs with a longer water retention time. In Hongjiadu Reservoir with the longest water retention time among the studied reservoirs, this difference reaches 9%. As a result, the influence of fiver damming, especially the influence of reservoirs in series, should be taken into account when calculating the chemical weathering rate of a fiver basin.

关键词： reservoirs in series chemical weathering rate wujiang

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