δD和δ^(18)O同位素技术在傍河水源地勘探中的应用研究——以洛阳吉利水源地为例  

Application study of δD and δ^(18)O isotope technology in the water resource exploration of riverside water source areas:A case of Jili water resource in Luoyang,Henan Province

作　　者：王广华 田大永 任静 孟冲 邓晓颖 Wang Guanghua;Tian Dayong;Ren Jing;Meng Chong;Deng Xiaoying(No.2 Institute of Geo-Environment Survey of Henan,Zhengzhou 450053,Henan)

机构地区：[1]河南省地质矿产勘查开发局第二地质环境调查院,郑州450053

出　　处：《工程勘察》2023年第10期28-34,共7页Geotechnical Investigation & Surveying

基　　金：河南省自然资源科研项目(2022-266-3);河南省国土资源科技项目(2013-85)。

摘　　要：为应对频发的极端气候灾害,提高居民用水安全系数,优化区内水资源分配,“双水源”建设已成为城市规划和发展中考虑的重大问题。本研究以黄河中下游过渡带洛阳吉利拟建水源地为例,通过不同水体中δD和δ^(18)O同位素的组成特征及分布规律分析,运用同位素分馏原理和质量平衡原理,揭示了水源地地下水的主要补给来源,计算了地下水补给高程,划分了黄河侧渗影响宽度,并采用现场水文地质调查法对分析结果进行验证。结果表明:区内地下水整体由西北向东南方向径流,水源地主要补给来源为地下水侧向径流、黄河侧渗和大气降水补给,各自贡献占比分别为68%、18%和14%。其中,地下水径流补给区为西北侧丘陵区的207~216m高程段,黄河侧渗补给宽度约为0.2~2.5km,且随着开采程度的增加,黄河侧渗补给宽度也相应逐渐扩大。证明傍河开采可激发黄河补给量,加快地下水更新速率,提高区域水资源利用率。故δD和δ^(18)O同位素技术在傍河水源地勘探中具有重要指示作用,本研究可为沿黄城市群的供水示范区建设提供经验参考。In order to cope with frequent extreme climate disasters,improve residents'water safety factor and optimize the allocation of water resources in the region,the construction of dual water sources has become a major issue in the urban planning and development.A case study of Jili water source project in Luoyang,Henan Province in the transition zone of the middle and lower reaches of the Yellow River was carried out.The main recharge sources of groundwater in the water source was revealed by analyzing the composition and distribution of δD and δ^(18)O isotopes in different water bodies,and applying the principle of isotope fractionation and mass balance,the groundwater recharge elevation was calculated,the influence width of lateral seepage of the Yellow River was divided,and field hydrogeological survey method was used to verify the analysis results.The results show that the overall groundwater runoff in the area is from northwest to southeast,and the main recharge sources are groundwater lateral runoff,lateral infiltration of the Yellow River and atmospheric precipitation recharge,which accounted for about 68%,18%and 14%respectively;the groundwater runoff recharge area is 207~216m in the northwest hilly area,and the width of the Yellow River lateral infiltration recharge is about 0.2~2.5km.With the increase of mining,the lateral seepage recharge width of the Yellow River also gradually expands.It is further proved that riverside mining can stimulate the Yellow River supply,accelerate the rate of groundwater renewal,and improve the utilization rate of regional water resources.Therefore,the δD and δ^(18)O isotope techniques play an important indicative role in the exploration of river source area,and this study can provide an empirical reference for the construction of water supply demonstration area along the Yellow River agglomeration.

关 键 词：同位素技术 傍河水源地 水文地质勘察 地下水流向 补给特征 

分 类 号：P641.3[天文地球—地质矿产勘探]