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Isotopic characteristics of precipitation, groundwater, and stream water in an alpine region in southwest China

机译：中国西南高寒地区降水，地下水和溪流水的同位素特征

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摘要

The hydrological cycle has been enhanced under the warmer climatic conditions on the southeastern edge of the Tibetan Plateau, China. To investigate the complex hydrological system in the study area, delta O-18 and delta H-2 were measured on waters in a mountainous region-Huang-bengliu watershed. The stream water tends to be isotopically more depleted in O-18 and H-2 than precipitation and groundwater, but more enriched than meltwater. A clear seasonality with higher isotopic values of stream water in summer and lower values in winter is evident, coinciding with the timing of the peak discharge. The correlation between delta O-18 and delta H-2 in stream water shows that the isotopic signature of precipitation is well preserved in stream flow, and the evaporation during the stream flow is only minor. The isotopic composition of stream water shows a decreasing trend from upstream to downstream, which results from tributary water inputs with heavy-isotope-depleted water. According to an isotopic mass-balance model, the fraction of meltwater inputs over the total stream flow ranged from 25.5 to 61.8 %. The study demonstrates that the ice-snow melting and tributary inputs are the prevailing mechanisms regulating stream isotope hydrology in alpine regions on the edge of the Tibetan Plateau.
机译：在青藏高原东南缘气候变暖的条件下，水文循环得到了加强。为了调查研究区的复杂水文系统，在山区-黄本留流域的水域上测量了三角洲O-18和三角洲H-2。与沉淀和地下水相比，O-18和H-2中的河水同位素更趋于耗尽，但比熔体水更富集。明显的季节变化是夏季的溪水同位素值较高，而冬季的同位素值较低，这与高峰排放时间一致。溪流水中的δO-18和δH-2之间的相关性表明，沉淀的同位素特征在溪流中得到了很好的保留，在溪流中的蒸发很小。溪流水的同位素组成从上游到下游呈递减趋势，这是由于支流水输入量少且同位素贫化所致。根据同位素质量平衡模型，融水输入量占总流量的比例为25.5％至61.8％。研究表明，冰雪融化和支流输入是调节青藏高原边缘高寒地区河流同位素水文学的主要机制。

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  • 来源
    《Environmental earth sciences》 |2016年第10期|894.1-894.11|共11页
  • 作者

    Meng Yuchuan; Liu Guodong;

  • 作者单位

    Sichuan Univ, State Key Lab Hydraul & Mt River Engn, Chengdu 610064, Peoples R China|Sichuan Univ, Coll Water Resources & Hydropower, Chengdu 610064, Peoples R China;

    Sichuan Univ, State Key Lab Hydraul & Mt River Engn, Chengdu 610064, Peoples R China|Sichuan Univ, Coll Water Resources & Hydropower, Chengdu 610064, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Stable isotope; Stream water; Meltwater; Tributary; Hydrological cycle; Tibetan Plateau;

    机译：稳定同位素;溪流水;融水;支流;水循环;西藏高原;

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