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Assessing impact of irrigation water on groundwater recharge and quality in arid environment using CFCs,tritium and stable isotopes,in the Zhangye Basin,Northwest China

Assessing impact of irrigation water on groundwater recharge...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Dajun Qin~(a,*),Yunping Qian~b,Liangfeng Han~c,Zhimin Wang~a,Chen Li~a,Zhanfeng Zhao~a a Key Laboratory of Engineering Geomechanics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China b Hydrology Bureau,Yellow River Conservancy Commission,Zhengzhou,Henan 450004,China c Isotope Hydrology Section,Department of Nuclear Sciences and Applications,International Atomic Energy Agency,P.O.Box 100,A-1400 Vienna,Austria

Environmental tracers CFCs,O,H and tritium were used to determine the natural groundwater recharge and the impact of irrigation activity on the groundwater system in the semi-arid Zhangye Basin of *** in the irrigated areas have been identified as mixtures containing fractions recharged in different periods of *** CFC and 3H data show that the oldest fraction in the ground-water was recharged before 1950,whereas the younger fractions were recharged in different periods of time since *** isotope(0,H),CFC and electrical conductivity data show that most of the samples can be regarded as binary mixtures with the river/irrigation water presents the younger fraction and the regional groundwater presents the older *** mixing model is used to estimate the age and fraction of the younger *** of the younger fraction was recharged after 1980s,in response to the increasing irrigation *** to local precipitation surface water plays a major role in recharging the aquifer in the irrigated *** irrigation activity had more impact on the aquifer under thin unsaturated zone(recharge, whereas it had less impact on the aquifer under thick unsaturated zone(tens of meters).CFCs are useful in identifying regions of different impact of irrigation return *** positive correlation between nitrate and CFC data show that contaminants are transported to the saturated zone by irrigation water. This study shows that in this semi-arid basin due to strong evaporation of infiltrating surface water and regional groundwater,5180 and EC values,in contrast to CFCs,do not show simple relationship with NO concentration in *** with a proper mixing model,however,they can provide evidences that the CFCs found in groundwater were introduced by infiltrating irrigation return flow and, therefore,reveal that human activities can produce a much localized water circulation

关键词： CFCs Isotopes groundwater age Irrigation water return groundwater recharge and quality Zhangye

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