北大河流域地下水化学演化与补给特征

摘要/Abstract

摘要： 综合运用水文地球化学与同位素技术研究北大河流域地下水演化规律,研究区地下水水化学类型从上游到下游由HCO-3型向SO2-4-HCO-3型变化,再过渡到SO2-4型；随着矿化度增大,各离子出现不同的增减速度,白云石和硬石膏的溶解引起Mg2+、SO2-4增加,阳离子交换作用对Na+影响较大,Ca2+则受矿物溶解沉淀及离子交换等的共同影响,另外,蒸发浓缩也是影响研究区水化学的一个重要因素。地下水稳定同位素分布范围较广,δ18O为-10.28～-7.85‰,δD为-65.07～-53.85‰,总体上,南盆地山前地带比细土平原同位素贫乏,南北两盆地地下水同位素差别不大,两盆地同位素氘盈余,反映了酒泉山前及浅层水是由现代河流渠系迅速补给,深层水是现代水和古水混合的,金塔地下水受人类活动影响较大,开发利用过程中一定要慎重。

关键词: 地下水, 水化学演化, 同位素

Abstract: The objectives of this study are to use hydrochemical and stable isotope technology to determine hydrochemical evolution of groundwater and its source in Beidahe river watershed of Gansu province. Along the groundwater path, groundwater evolves gradually from HCO-3 to SO2-4-HCO-3, and then becomes SO2-4. The growth rates of defferent ions are defferent with increase of total dissolved solid. The dissolution of dolomite and gypsum contribute to increase of Mg2+ and SO2-4, and other processes such as cation-exchange have significative contribution on the water composition, especially for Na+. Ca2+ is strongly influenced by dissolution-precipitation and subsequent cation-exchange. Evaporation of shallow groundwater occurred during the path. The stable isotope ranges from -10.28 to -7.85‰ for δ18O, and from -65.07 to -53.85‰ for δD. There is not significant defference for isotope between Jiuquan basin and Zhangye basin in Gansu province, but the isotope is deficient at piedmont compared with at plains in Jiuquan basin. The river runoff is the main source for alluvial fan groundwater, but the deep groundwater is complex. So we must be cautious during the exploitation of groundwater.

Key words: groundwater, geochemical evolution, stable isotope

中图分类号:

P641

何建华;付素静;马金珠;张清寰. 北大河流域地下水化学演化与补给特征[J]. 中国沙漠, 2011, 31(6): 1630-1638.

HE Jian-hua;FU Su-jing;MA Jin-zhu;ZHANG Qing-huan. Groundwater Recharge and Geochemical Evolution in Quaternary Aquifer of Beidahe River Watershed[J]. JOURNAL OF DESERT RESEARCH, 2011, 31(6): 1630-1638.

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