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《Resources and Environment in the Yangtze Basin》 2009-04
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DAMMING EFFECT ON WATER DISSOLVED CHEMISTRY COMPONENTS——A CASE STUDY OF WUJIANGDU RESERVOIR WATER IN SUMMER,SOUTHWEST CHINA

HAN Zhi-wei1,LIU Cong-qiang2,WU Pan1,WANG Fu-shun3,WANG Bao-li2,LI Si-liang2,GUAN Jin2(1.College of Mineral Resources and Environment,Guizhou University,Guiyang 550003,China;2.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China; 3.College of Environmental and Chemical Engineering,Shanghai University,Shanghai 201800,China)  
This study investigated the water chemistry of Wujiangdu Reservoir and its response to river damming.Results showed that major ionic chemistry of the reservoir dominated by HCO-3,SO2-4,Ca2+ and Mg2+,which account for about 90% of the total solutes in the water.It is concluded that limestone weathering,among silicate rock and evaporation weathering,are the most important controls on the water chemistry.The reservoir showed clear temperature stratification,and hence induced different chemical composition of major ions in the water of different water layers.Accordingly,dissolved components appeared different distribution characteristics along the water column.Si and Chlorophyll showed a negative correlation with each other in the vertical profile,due to biological function such as algal absorption.Concentration of HCO-3 decreased from surface water to 30 m in depth and then increase downwards,controlled by both photosynthesis and organic decomposition.River damming and the ways of water discharge of the reservoir can change the water chemistry of the reservoir and discharged water.In Pianyan River and Xifeng River Ca2+,SO2-4,HCO-3 Mg2+,K+,Na+ and Cl-have contributions to Wujiangdu Reservoir.Fish feeding,sewage inputs,fertilizer use and acid rain deposition are the possible contaminant sources for the reservoir water.
【Fund】: 国家自然科学基金项目(90610037和40603006);; 中国科学院创新团队国际合作伙伴计划;; 国家重点基础发展研究计划(2006CB403205)资助
【CateGory Index】: X832
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