鄱阳湖流域河水、湖水及地下水同位素特征分析
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P343

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国家重点基础研究发展计划(973计划)(2012CB417005);国家自然科学基金(61301025)


Analysis of isotopes characteristics of river water, lake water and groundwater in Poyang Lake Basin
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    摘要:

    利用鄱阳湖流域同位素按月份呈周期性变化的特征,将氘氧同位素关系作为示踪剂,研究降水入渗及地下水、河水与湖水之间的转化关系。结果表明:4月中旬湖水、河水、井水的δDδ18O的均值分别为(-2.32%,-0.42%)、(-2.86%,-0.48%)和(-3.18%,-0.55%),δ18O~δD关系点都落在全球雨水线GMWL上;湖水最为富集,湖水的补给除河水之外,湖区及周边的降水也占一定比例。7月下旬湖水、河水与井水的δDδ18O值明显比4月中旬的值贫化,与降水同位素变化趋势相一致,经历干旱高温天气后,湖水、河水与井水的δ18O~δD关系点落在蒸发线(EL2)上。同位素数据表明,井水与河水之间的转化性强,大量降水入渗地下成为潜水,通过地下径流补给河流,降水转化为河水的周期大约经历了1个月。3—6月为雨季,鄱阳湖对长江水的补给较大,影响到长江水中的同位素。

    Abstract:

    Based on the month cyclical changes of the isotopes of Poyang Lake Basin, we selected the deuterium isotope and oxygen isotope as a tracer to study the conversion relationship between the infiltration of precipitation, groundwater, rivers and lakes. The results indicate that in mid April the average values of δD and δ18O of lake water, river water and well water were(-2. 32%, -0. 42%), (-2. 86%, -0. 48%)and(-3. 18%, -0. 55%), respectively. The values of δD and δ18O scatter close to the Global Meteoric Water Line(GMWL). The isotopes in lake water are the most enriched, and the lake is not only supplied by rivers but also by precipitation around the lake. In late July, the δD and δ18O values of lake water, river water and well water are extremely depleted than that in mid April, which is consistent with the variation trend of isotopes in the precipitation. After experiencing the drought and high temperature, δD and δ18O values of lake water, river water and well water scatter along the evaporation line(EL2). The isotope data shows that the conversion between the well water and the river water is very frequent. Most of the precipitation infiltrates downward and becomes phreatic water, and then recharges river water through underground runoff. The cycle of precipitation conversing into the river water is about 1 months. During the rainy season from March to June, Poyang Lake greatly recharges the Yangtze River, which will affect the isotopic composition of the Yangtze River water.

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陈建生,彭靖,詹泸成,等.鄱阳湖流域河水、湖水及地下水同位素特征分析[J].水资源保护,2015,31(4):1-7.(CHEN Jiansheng, PENG Jing, ZHAN Lucheng, et al. Analysis of isotopes characteristics of river water, lake water and groundwater in Poyang Lake Basin[J]. Water Resources Protection,2015,31(4):1-7.(in Chinese))

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  • 收稿日期:2015-01-07
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  • 在线发布日期: 2015-08-03
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