马莲河流域下游水体~(222)Rn特征及指示意义
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摘要
为揭示黄土高原典型流域地表水和地下水相互作用规律,以马莲河流域下游为例,应用氡同位素~(222)Rn示踪方法分析了不同水体~(222)Rn分布特征、影响因素以及河水和地下水转化关系,并利用氡同位素梯度指示河水和地下水作用强度。结果表明:马莲河下游不同水体~(222)Rn活度差异较大,表现为白垩系地下水>黄土地下水>第四系地下水>河水。岩性是控制地下水中~(222)Rn活度分布的首要因素,构造和氧化还原条件对其也有影响,河水~(222)Rn活度主要受地下水补给的影响。马莲河下游各段~(222)Rn同位素梯度分布表明R02—R03,R03—R04,R13—R14段地下水大量补给河水,其他区段地下水无补给或补给强度较低。
Radon isotope was utilized as a tracer to determine the river-groundwater interaction and explore the spatial variation and controlling factors of ~(222)Rn activity in river water and groundwater in the lower reach of the Malian River. Isotope gradient was proposed as an indicator of the magnitude of river water and groundwater interaction. The results implied that ~(222)Rn activity was considerably lower in river water than that in groundwater. The highest ~(222)Rn activity in groundwater was found in the Cretaceous aquifer, followed by the loess aquifer, the quaternary aquifer, and river water in sequence. Moreover, ~(222)Rn activity in groundwater was controlled by lithology, geological formation and redox conditions and lithology was the most important factor, whereas ~(222)Rn activity in river water was influenced by groundwater discharge. The distribution of ~(222)Rn isotopic gradient provided a detailed profile of river water and groundwater interaction. A positive index indicated that groundwater had entered surface water between those sites of R02-R03, R03-R04 and R13-R14, while a weaker interaction in other sites.
Radon isotope was utilized as a tracer to determine the river-groundwater interaction and explore the spatial variation and controlling factors of ~(222)Rn activity in river water and groundwater in the lower reach of the Malian River. Isotope gradient was proposed as an indicator of the magnitude of river water and groundwater interaction. The results implied that ~(222)Rn activity was considerably lower in river water than that in groundwater. The highest ~(222)Rn activity in groundwater was found in the Cretaceous aquifer, followed by the loess aquifer, the quaternary aquifer, and river water in sequence. Moreover, ~(222)Rn activity in groundwater was controlled by lithology, geological formation and redox conditions and lithology was the most important factor, whereas ~(222)Rn activity in river water was influenced by groundwater discharge. The distribution of ~(222)Rn isotopic gradient provided a detailed profile of river water and groundwater interaction. A positive index indicated that groundwater had entered surface water between those sites of R02-R03, R03-R04 and R13-R14, while a weaker interaction in other sites.
引文
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[16] 赵威光,郭华明,张莉,等.河套平原沉积物中铀的赋存形态及其与地下水铀浓度的关系[J].水文地质工程地质,2015,42(2):24-30.
[2] 杨勇,赵坚,陈孝兵,等.河道低温水对地表水-地下水交错带温度的影响[J].长江科学院院报,2012,29(1):20-24.
[3] 邓志民,张翔,潘国艳.武汉市大气降水的氢氧同位素变化特征[J].长江科学院院报,2016,33(7):12-17.
[4] 李艳平,李兰,朱灿,等.地表水地下水的交互作用与耦合模拟[J].长江科学院院报,2006,23(5):17-20.
[5] 宋献方,刘鑫,夏军,等.基于氢氧同位素的岔巴沟流域地表水-地下水转化关系研究[J].应用基础与工程科学学报,2009,17(1):8-20.
[6] HUANG T,PANG Z.Changes in Groundwater Induced by Water Diversion in the Lower Tarim River,Xinjiang Uygur,NW China:Evidence from Environmental Isotopes and Water Chemistry[J].Journal of Hydrology,2010,387(3):188-201.
[7] YU M C L,CARTWRIGHT I,BRADEN J L,et al.Examining the Spatial and Temporal Variation of Groundwater Inflows to a Valley-to-Floodplain River Using 222Rn,Geochemistry and River Discharge:The Ovens River,Southeast Australia[J].Hydrology & Earth System Sciences,2013,17(12):4907-4924.
[8] LEFEBVRE K,BARBECOT F,LAROCQUE M,et al.Combining Isotopic Tracers (222Rn and δ13C) for Improved Modeling of Groundwater Discharge to Small Rivers[J].Hydrological Processes,2015,29(12):2814-2822.
[9] 苏小四,万玉玉,董维红,等.马莲河河水与地下水的相互关系:水化学和同位素证据[J].吉林大学学报(地球科学学报),2009,39(6):1087-1094.
[10] 李云峰,李金荣,侯光才,等.从水文地球化学角度研究鄂尔多斯盆地南区白垩系地下水的排泄途径[J].西北地质,2004,37(3):91-95.
[11] 解建仓,张建龙,朱记伟,等.马莲河苦咸水来源分析及治理方案[J].资源科学,2011,33(1):77-85.
[12] CARTWRIGHT I,HOFMANN H,SIRIANOS M A,et al.Geochemical and 222Rn Constraints on Baseflow to the Murray River,Australia,and Timescales for the Decay of Low-salinity Groundwater Lenses[J].Journal of Hydrology,2011,405(3/4):333-343.
[13] 潘峰,郭占荣,马志勇,等.胶州湾周边地下水和河水中222Rn的分布特征及影响因素[J].核化学与放射化学,2015,37(6):490-496.
[14] 张钟先,田均良.黄土区土壤中天然放射性元素背景值研究[J].中国环境科学,1993,13(4):288-292.
[15] KLUGE T,ROHDEN C V,SONNTAG P,et al.Locating and Quantifying Groundwater Inflow into Lakes Using High-precision 222Rn Profiles[J].Journal of Hydrology,2012,450/451:70-81.
[16] 赵威光,郭华明,张莉,等.河套平原沉积物中铀的赋存形态及其与地下水铀浓度的关系[J].水文地质工程地质,2015,42(2):24-30.