太行山前平原浅层地下水年龄及其对含水层固有脆弱性的指示意义

Shallow groundwater ages and implication to the intrinsic vulnerability of aquifers in piedmont plain of Taihang mountain

地下水资源在生产和生活供水中占有重要地位,然而随着人类活动的不断增强,很多地区出现了地下水污染的现象,使得地下水保护研究成为一项势在必行的工作。已有研究显示,地下水年龄可以指示含水层固有脆弱性程度,反映地下水的潜在污染风险性。本次以太行山前平原为研究区,利用3H(3H/3He)同位素识别了浅层地下水年龄并探讨了其对含水层固有脆弱性的指示意义。结果显示,研究区浅层地下水年龄普遍小于40年,由山前至平原沿地下水流动方向呈现增大特征,并呈现较好的分带性。同时,通过对比前人提出的地下水中现代水的含量指示含水层固有脆弱性的方法,揭示地下水年龄的分布,对含水层固有脆弱性亦具有较好的指示意义。结果显示,研究区含水层固有脆弱性由山前到平原呈现降低趋势,并利用其他指标和数据进行了验证和讨论。

Groundwater resources play an important role in water supply for industry and living,however,with the increasing of human activities,groundwater pollution has occurred in many areas.Therefore,groundwater protection research becomes an imperative basic work.Previous studies showed that groundwater ages can indicate the intrinsic vulnerability of aquifers,which reflected the potential pollution risk of groundwater.Taking the piedmont plain of Taihang mountain as an example,the groundwater ages and their implication to intrinsic vulnerability were studied based on 3H(3H/3He)isotopes.The results showed that the ages of the shallow groundwater in the study area were generally less than 40 years,which increased along the direction of groundwater flow from piedmont to plain,and presented a better zonation feature.Simultaneously,comparing with the method of indicating inherent vulnerability of aquifer by content of modern water in groundwater,it revealed that the distribution of groundwater ages also displayed a good indication.The results showed that inherent vulnerability of the aquifers in the study area showed a decreasing trend from the piedmont to the plain,and was discussed and verified with other indicators and data.