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Changes in groundwater induced by water diversion in the Lower Tarim River,Xinjiang Uygur,NW China:Evidence from environmental isotopes and water chemistry

Changes in groundwater induced by water diversion in the Low...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Tianming Huang~(a,b),Zhonghe Pang~(a,*) a Key Laboratory of Engineering Geomechanics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China b Graduate School,Chinese Academy of Sciences,Beijing 100039,China

The Lower Tarim River in NW China is under severe ecosystem degradation due to stopped stream flow and diminished groundwater *** year 2000,eight water diversions from the upper stream and from the neighboring Kaidu-Kongque River have been implemented to alleviate the ecosystem disaster. In order to assess the effectiveness of the water diversion project and to identify proper tracers of groundwater dynamics,we sampled the riparian groundwater system in 2007 and 2008 along the 350 km-long river channel through the 40 monitoring wells situated along nine transects perpendicular to the river and three soil *** on the samples have included environmental isotopes (O,H,H)and water *** results show that remarkable changes have been induced by the water *** observed response of riparian groundwater system includes general decrease in total dissolved solid(TDS)and rise of water *** with greater than 1 m rise in water table is within～700 m from the riverbank in the upper segments and～300 m in the lower *** rise of water table occurs near the river *** data show that the extent of modern recharge(since 1960s),including that from the diverted water,is limited to 600 m from the riverbank at the upper segments and 200 m at the lower *** isotopes show that groundwaters,regardless of modern or pre-modern,are enriched in heavy isotopes and are plotted in parallel to the meteoric water line in theδ-δplot,attributed to evaporation during *** is generally of Na-Mg-Cl-SO type and is formed by dissolution of minerals,such as halite,sulfate,and carbonates,based on component correlation matrices *** salinity of groundwater is mainly affected by that of the diverted water and of the local antecedent groundwater,salts in the unsaturated zone,evapotranspiration during *** the zone of smaller groundwater depth(less than 5 m)suitable for the most existing Populus euphratica and

关键词： Water diversion Environmental isotopes Water chemistry salinization mechanism Tarim River Arid environment

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