Study on Groundwater Cycle in Beijing Pinggu Basin Based on Isotopes and Hydrochemistry
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摘要:
通过在区域开展地下水同位素、水化学取样分析，研究了平谷泃河和洳河冲洪积扇地下水循环演化特征。分析结果显示：本次所取水样pH值为7.6～8.1，为中性水；阳离子含量均以Ca2+、Mg2+为主，占70%以上，阴离子含量以HCO3−为主，占82%以上，所取水样地下水水化学类型均为HCO3•Ca•Mg 型。研究区浅层第四系松散孔隙水δ2H值和δ18O值分别为64.9‰、9.08‰，深层第四系松散孔隙水δ2H值和δ18O值分别为67.6‰、δ18O值，基岩岩溶水δ2H值和δ18O值分别为64.5‰、9.36‰。基岩岩溶水稳定同位素含量均值与浅层地下水比较接近；浅层第四系松散孔隙水14C含量为46.7%～93.1%，深层水第四系松散孔隙水14C含量为40.23%～61.13%，基岩岩溶水14C含量为46.79%～89.2%，与浅层第四系松散孔隙水比较接近。通过分析研究掌握了北京平谷盆地地下水的循环演化规律，盆地第四系孔隙水和隐伏基岩岩溶水的水力联系，研究成果能够为平谷盆地地下水水文地质概念模型的建立、水文地质参数的初步确定、地下水资源计算评价提供技术支撑。
Abstract:Based on the analysis of groundwater isotope and water chemical sampling in the region, the evolution characteristics of groundwater circulation in the alluvial fan of Juhe and Ruhe rivers in Pinggu were studied. The analysis results show that the pH value of the water sample is between 7.6 and 8.2, which is neutral water. The cationic content is mainly Ca2+ and Mg2+, accounting for more than 70%, and the anionic content is mainly HCO3–, accounting for more than 82%. The water chemical type of the groundwater samples is HCO3•Ca•Mg. In the study area, the stable isotope content of shallow quaternary loose pore water is (δ2H: 64.9 ‰, δ18O: 9.08 ‰), the meanstable isotope content of deep quaternary loose pore water is (δ2H: 67.6 ‰, δ18O: 9.97 ‰), and the stable isotope content of bedrock karst water is (δ2H: 64.6 ‰, δ18O: 9.36 ‰). The average stable isotope content of bedrock karst water is close to that of shallow groundwater. The 14C content of shallow quaternary loose pore water is 46.7%～93.1%, that of deep quaternary loose pore water is 40.23%～61.13%, and that of bedrock karst water is 53.7%～89.2%,which is close to that of shallow Quaternary loose pore water.Through the analysis and research to master the Beijing pinggu basin groundwater circulation evolution, basin quaternary pore water and concealed rock karst water hydraulic connection, research results for pinggu basin groundwater hydrogeological conceptual model and hydrogeological parameters of a preliminary determination, evaluation of groundwater resources calculation provides the technical support.
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Keywords:
- Pinggu basin /
- hydrochemistry /
- 2H /
- 18O /
- hydraulic connection
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图 4 泃河A–B剖面主要阴阳离子含量变化情况图
Figure 4. Major cations and anions change of A–B profile in Juhe river
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图 5 洳河C–D剖面主要阴阳离子变化情况图
Figure 5. Major cations and anions change of C–D profile in Ruhe river
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图 6 泃河和洳河地下水δ2H和δ18O组成
Figure 6. Composition of underground water δ2H and δ18O in Juhe river and Ruhe river
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图 9 泃河、洳河14C含量在垂向变化情况图
Figure 9. The vertical change of 14C content in Ju’ River and Ru’River
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图 10 平谷区2017年6月潜水含水层流场图
Figure 10. Flow field of phreatic aquifer in Pinggu District in June 2017
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图 11 王都庄、中桥水源地地区地下水位动态曲线图
Figure 11. Dynamic curve of groundwater level in Wangduzhuang and Zhongqiao water source areas
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图 12 泃河冲洪积扇地下水循环模式剖面示意图
Figure 12. Schematic diagram of groundwater circulation mode of Ju river alluvial fans
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图 13 洳河冲洪积扇地下水循环模式剖面示意图
Figure 13. Schematic diagram of groundwater circulation mode of Ru river alluvial fans
表 1 同位素取样情况表
Table 1 Isotope sampling situation table
样点编号 地理位置 取水层位 取水深度（m） 水位埋深（m） Δ2H （‰） Δ18O（‰） 14C P01 靠山集村吃水井 蓟县雾迷山 16～142 38 −64 −9.09 46.79 P02 平谷金海湖镇政府院内 蓟县雾迷山 30～136 / −63.6 −9.51 79.97 P05 南独乐河镇新农村 蓟县雾迷山 ≥150 / −67 −10.23 75.22 P03 望马台村东 第四系浅层 60～78 15 −61.6 −8.71 86.7 P04 望马台村东北 蓟县雾迷山 ≥70 12 −62.5 −8.8 87.2 P06 平谷张辛庄村供水井 蓟县雾迷山 80～100 35 −63.6 −9.96 85.98 P07 王都庄水源地 第四系浅层 30～40 34 −62 −8.5 / P08 东高村镇西高村西 第四系浅层 20～50 22.4 −62.8 −8.65 / P09 东高村镇西高村西 蓟县雾迷山 ≥117 24.6 −66.7 −9.41 53.7 P10 西鹿角村路东 第四系浅层 20～43 20 −67.2 −9.5 92.21 P11 西鹿角村路东 第四系浅层 66～96 30 −67 −10.18 57.21 P12 西鹿角村路东 第四系深层 127～166 30 −67 −10.4 41.65 P13 西鹿角村路西 第四系深层 216～284 37.5 −69 −10.14 40.23 P14 平谷马昌营镇薄各庄村南S204路西花园 第四系浅层 18～43 10 −62.1 −8.66 93.61 P15 平谷马昌营镇薄各庄村南S204路西花园 第四系浅层 72～98 36.5 −65.8 −8.91 53.77 P16 平谷马昌营镇薄各庄村南S204路西花园 第四系深层 128～160 37 −67 −10.06 61.13 P17 马坊村 第四系浅层 80～100 32 −68 −9.4 46.79 P1 翟各庄村东 长城高于庄 ≥6 24 −65.7 −9.23 / P2 中桥水源地水源井 长城高于庄 ≥163 15 −65.9 −9.38 77.85 P3 中桥水源地水源井 第四系浅层 40～149 30 −64.3 −9.08 76.31 P4 中桥水源地第四系井 第四系浅层 50～80 28.5 −64.9 −9.15 / P5 中桥水源地中桥村西 第四系深层 40～130 28 −67.3 −10.15 / P6 后芮村 第四系浅层 80～148 14 −68 −9.2 60.51 Q 小东沟泉 泉水 / / −61.9 −8.67 / 
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表 2 水化学测试成果表
Table 2 Hydrochemistry test results
样点
编号钾
（mg/L）钠
（mg/L）钙
（mg/L）镁
（mg/L）重碳酸盐
（mg/L）氯化物
（mg/L）硫酸盐
（mg/L）溶解性总固体
（mg/L）pH值 水化学
类型P01 1.94 9.05 66.1 32.9 253 16.8 16.8 489 7.72 HCO3•Ca•Mg P02 2.21 17.5 70.5 36 317 32.2 25.4 395 7.5 HCO3•Ca•Mg P03 1.89 13.6 62.7 32.8 265 26.8 32.4 353 7.79 HCO3•Ca•Mg P04 1.33 3.69 52 26.2 239 7.09 14.3 379 7.8 HCO3•Ca•Mg P05 1.04 6.19 44.6 23 235 5 6.75 339 7.8 HCO3•Ca•Mg P06 1.17 14.9 53.7 27.7 187 23.9 17.3 392 7.53 HCO3•Ca•Mg P07 1.17 4.04 41.1 23.7 199 18.8 13.8 317.1 7.9 HCO3•Ca•Mg P08 1.53 21.3 97.3 35 413 29.4 41.7 631 7.38 HCO3•Ca•Mg P09 2.81 9.2 46.6 26.4 277 2.96 9.1 366 7.77 HCO3•Ca•Mg P10 1.28 9.41 52.3 20.7 281 5.7 10.6 381 8.02 HCO3•Ca•Mg P11 0.66 21.5 66.5 23.3 328 5.3 4.4 464 7.99 HCO3•Ca•Mg P12 1.84 12.9 45.7 21.1 250 8.7 12.4 359 7.96 HCO3•Ca•Mg P13 2.31 20.8 34.7 23.8 227 4.6 12.9 346 8.1 HCO3•Ca•Mg P14 0.53 26.6 69.7 29.4 400 8.2 10.5 546 7.56 HCO3•Ca•Mg P15 0.95 8.36 61.7 26.1 320 5.9 5.6 435 7.62 HCO3•Ca•Mg p16 0.56 26.3 67.9 28.1 397 6.9 11.1 542 7.64 HCO3•Ca•Mg P17 1.23 11.4 46.7 20.9 247 5.2 12.3 350.2 7.73 HCO3•Ca•Mg P1 1.48 9.16 55.9 21.4 251 15.5 36.8 384 7.94 HCO3•Ca•Mg P2 1.43 10.2 65.4 26.2 253 16.1 22.5 455 7.7 HCO3•Ca•Mg P3 2.61 10 50.5 22.7 247 7.1 17.2 384 7.6 HCO3•Ca•Mg P4 1.49 6.87 55.7 25 281 11.9 9.8 262 7.69 HCO3•Ca•Mg P5 1.51 8.6 74 31.6 268 16.7 23.4 526 7.73 HCO3•Ca•Mg P6 1.02 6.51 47.5 22.8 247 6.1 8.8 349.8 7.94 HCO3•Ca•Mg Q 1 2.93 51.2 27 245 6.17 12.5 378 7.88 HCO3•Ca•Mg
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表 3 典型点第四系地下水和基岩岩溶水2H和18O值表
Table 3 2H and 18O values of quaternary groundwater and bedrock karst water at typical points
位置 Δ2H （‰VSMOW） δ18O （‰VSMOW） 望马台村东第四系井 −61.6 −8.7 望马台村东北基岩井 −62.5 −8.8 中桥水源地第四系井 −64.9 −9.2 中桥水源地水源井基岩井 −65.9 −9.4 东高村镇西高村西第四系井 −66.4 −9.41 东高村镇西高村西基岩井 −62.8 −8.65
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