基于环境示踪剂氯的北山地区浅部地下水补给研究  

Estimation of shallow groundwater recharge using the environmental tracer chloride method in Beishan Area

作　　者：李杰彪[1] 苏锐[1] 周志超[1] 郭永海[1] 季瑞利[1] 张明[1] 王洪斌[1] LI Jie-biao;SU Rui;ZHOU Zhi-chao;GUO Yong-hai;JI Rui-li;ZHANG Ming;WANG Hong-bin(CNNC Key Laboratory on Geological Disposal of High-level Radioactive Waste,Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院,中核高放废物地质处置评价技术重点实验室,北京100029

出　　处：《干旱区地理》2020年第1期135-143,共9页Arid Land Geography

基　　金：核设施退役及放射性废物治理专项项目(科工二司〔2017〕1405号)。

摘　　要：地下水补给研究是高放废物深地质处置库选址和场址评价的重要研究内容之一。甘肃北山地区是我国高放废物地质处置库场址首选预选区,为查明该区地下水补给特征,基于环境示踪剂氯查明了北山地区浅部地下水补给量。结果表明:(1)总体而言,氯质量平衡方法在北山地区应用效果较好。(2)基于包气带的氯质量平衡方法计算得出的浅部地下水垂向补给量在渗透性较大的沟谷盆地中为0.07~2.03 mm·a-1,平均值约1.0 mm·a-1。(3)基于饱和带的氯质量平衡方法计算得出北山地区浅部地下水多年平均入渗补给量为0.25 mm·a-1,不足多年平均降水量的0.5%。相关结果可为我国高放废物地质处置库选址和场址评价提供依据。Hydrogeological condition is one of the most important factors in the site selection and site safety assessment for the disposal of high-level radioactive waste(HLW).Furthermore,groundwater recharge research is of importance in the study of hydrogeology.Beishan area in Gansu Province,China is a preselected priority region for disposal of China’s HLW.Beishan area locate in the north of Hexi Corridor,Gansu Province,about 70 km south of Yumen Town In order to find out the groundwater recharge in this area,this paper used the chloride mass balance(CMB)method in the unsaturated zone as well as the saturated zone.Considering the thickness and the lithology of the unsaturated zone,the typical profile and the available fieldwork,four typical profiles were carried out in Beishan area.They are located in Suanjingzi,Shazaoyuan and Xinchang respectively.In addition,this experiment successfully collected 45 samples of shallow groundwater.The groundwater level of most wells are less than 10 meters.The distribution of the wells is relatively evenly.The result indicated as follows:(1)In general,the applicability of the CMB method in Beishan area is good.The groundwater recharge rate ranges from 0.07 mm·a-1 to 2.05 mm·a-1 based on unsaturated CMB method,where all the profiles were located in the gully basin with relatively larger permeability.The groundwater recharge rate is approximately 0.26 mm·a-1 based on saturated CMB method,which accounts for only 0.40%of the average annual precipitation.(2)The CMB method based on the unsaturated zone is limited where the background value is high.Therefore,other methods should be considered in these areas,such as the artificial tracer method,3H,Br,water-table fluctuation method,water-budget models method.(3)The chloride concentration in atmospheric precipitation has a great effect on the results as the background input data.(4)Due to the complexity and uncertainty of the groundwater recharge research,it is suggested that other methods should be studied on the basis of this study,such a

关 键 词：地下水补给 高放废物地质处置 环境示踪剂 氯质量平衡法 

分 类 号：TL942.1[核科学技术—辐射防护及环境保护] P641.2[天文地球—地质矿产勘探]