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首页> 外文OA文献 >Application of environmental tracers for investigation of groundwater mean residence time and aquifer recharge in fault-influenced hydraulic drop alluvium aquifers
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Application of environmental tracers for investigation of groundwater mean residence time and aquifer recharge in fault-influenced hydraulic drop alluvium aquifers

机译：环境示踪器在地下水平均停留时间和含水层充电中的应用的应用液压液滴含水层

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Investigating groundwater residence time and recharge sources is crucial forwater resource management in the alluvium aquifers of arid basins.Environmental tracers (chlorofluorocarbons, 3H, 14C, δ2H,δ18O) and groundwater hydrochemical components are used forassessing groundwater mean residence times (MRTs) and aquifer recharge infault-influenced hydraulic drop alluvium aquifers in the Manas River basin(China). Aquifers under the Manas River upstream (south of the fault)contains very high 3H activity (41.1–60 TU), implying waterrecharge affected by the nuclear bomb tests of the 1960s. Carbon-14groundwater age correlates positively with distance from mountain area(3000–5000 years in the midstream to > 7000 years in thedownstream) and groundwater depth, but correlates negatively to a decrease in3H activity (1.1 TU) and more negative δ18O values.This phenomenon reveals that the source of the deeper groundwater in thesemi-confined aquifer is paleo-meteoric recharge. Special attention has beenpaid to the estimation of MRTs using CFCs and 3H by an exponentialpiston flow model. The results show that MRTs vary from 19 to 101 years byCFCs and from 19 to 158 years by 3H. MRTs estimated from3H are much longer than those from CFCs, probably due to thedifferent time lag of liquid (3H) and gas-phase CFCs through theunsaturated zone. The MRTs estimated by CFCs show good correlations with pHand the concentrations of SiO2 and SO42-, which canprovide a possible approach to estimate first-order proxies of MRTs forgroundwater age. The young water fractions are investigated by the CFC binarymixing method in the south and north of the fault. Relatively modern rechargeis found in the south of the fault with young (post-1940) water fractions of87 %–100 %, whereas in the north of the fault the young waterfractions vary from 12 % to 91 %. This study shows that thecombination of CFCs and 3H residence time tracers can help inanalysing the groundwater MRTs and the recharge sources for the differentmixing end-members.
机译：调查地下水停留时间和充电来源是干旱盆地的含水含水层中的关键水资源管理。环境示踪剂（氯氟烃，3H，14C，Δ2H，Δ18O）和地下水氢化物组分用于地下水平均停留时间（MRTS）和含水层补给在玛纳斯河流域（中国）中有影响液压液滴血液含水层。在玛纳斯河上游（断层的南部）下的含水层包含非常高的3H活动（41.1-60 TU），暗示受20世纪60年代核弹测试影响的水推力。 Carbon-14croundwater年龄与山区区域（中游3000-5000岁的距离在上游）和地下水深度的距离相关，但地下水深度，但对13h活动（1.1u）和更负Δ18o值的降低相关。这一现象揭示了Chesemizi含水层的深层地下水的来源是古流学的充值。特别注意使用CFCS和3H估计MRTS通过指数间隙流量模型来估计MRT。结果表明，MRTS从19到101年的BYCFS和19岁到158年之间有所不同。估计从3H的MRT比来自CFC的MRTS长得多，这可能是由于液体（3H）和气相CFC的液相滞后，通过刺刺区。 CFC估计的MRTS与PPAND浓度的SiO2和SO42-均显示出良好的相关性，这可以通过难以估算MRTGGater时代MRTS的一阶代理的可能方法。通过南部和北部的CFC二进制混合方法研究了幼小的水分。相对现代的reChargeis在南部发现的南部有年轻（1940年）水分分数为87％-100％，而在北北部的幼小水路中的次数从12％变化到91％。本研究表明，CFCS和3H停留时间示踪剂的诱变可以帮助为不同混合终构件进行地下水MRTS和充电来源。

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