利用水同位素和水文地球化学证据表征张家口地区的地下水年龄和补给率

查看全文 作　　者：[1]张清华;[1]罗专溪;[3]陆文;HARALD [4]Zepp;[1,2]赵玉峰;[3]唐家良

机构地区：[1]Key Laboratory of Urban Environment and Health,Institute of Urban Environment,CAS,Xiamen 361021,Fujian,China;[2]College of Geographical Science,Shanxi Normal University,Linfen 041000,Shanxi,China;[3]Institute of Mountain Hazards and Environment,CAS,Chengdu 610041,China;[4]Geographical Institute,Ruhr-University Bochum,Bochum D-44780,Germany

出　　处：《Journal of Geographical Sciences》索引2020年第30卷第6期,共14页

基　　金：The National Major Science and Technology Program for Water Pollution Control and Treatment,No.2017ZX07101001-02。 摘　　要：Despite the increasing depletion of the groundwater at the Zhangjiakou aquifer system in the northwest of Beijing-Tianjin-Hebei region,little information is available on the hydrological process of groundwater in this region.In this study,we utilized water isotopes composition(51sO,5D and 3H)of groundwater,river and precipitation to identify the characteristics of hydrochemistry,groundwater age and recharge rates in different watersheds of the Zhangjiakou area.Results showed that the river water and groundwater could be characterized as HCO3-Mg Na,HCO3 CI-Na and HCO3-Mg Na,HCO3 CI-Na,HCO3 CI-Na Mg types,respectively.The 5D and 5180 values in precipitation were linearly correlated,which is similar to the Global Meteorological Water Line(GMWL).Furthermore,the decreasing values of the 6D and 5180 from precipitation to surface water and groundwater indicate that groundwater is mainly recharged by atmospheric precipitation.In addition,the variation of 3H concentration with depth suggests that groundwater shallower than around 100 m is generally modern water.In contrast,groundwater deeper around 100 m is a mixture of modern and old waters,which has longer residence times.Groundwater showed a relatively low tritium concentration in the confined aquifers,indicating the groundwater recharged might be relatively old groundwater of over 60 years.The flow velocity of the groundwater in the study area varied from 1.10 to 2.26 m/a,and the recharge rates ranged from 0.034 to 0.203 m/a.The obtained findings provide important insights into understanding the groundwater recharge sources and hydrochemistry in the Zhangjiakou area,in turn developing a sustainable groundwater management plan. 关键词：hydrogen and oxygen isotopes tritium isotope water cycle GROUNDWATER Zhangjiakou

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利用水同位素和水文地球化学证据表征张家口地区的地下水年龄和补给率

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