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青海湖泉湾镭同位素的空间分布与沿岸地下水排放评价
苏维刚1, 沙占江2, 孔凡翠3, 王求贵2, 马茹莹1, 刘磊1
1.青海省地震局 青海 西宁;2.青海师范大学 青海 西宁;3.中科院青海盐湖研究所 青海 西宁
摘要:
青海湖是青藏高原的重要组成部分,它是维系青藏高原东北部生态安全的重要水体。其地下水的排放直接影响了青海湖的水文生物地球化学过程,然而对地下水的排放的研究仍然存在不足。本次研究于2014年对青海湖泉湾湖水、河水和地下水进行Ra活度的测定分析,并对泉湾湖水水平向和垂直向的Ra活度分布进行深入分析,最后估算并探讨了泉湾水体的停留时间和布哈河口沿岸地下水的排放通量。其中不同端元的水体223Ra和224Ra活度值分别为0.441 dpm/100L和0.026 dpm/100L、0.22 dpm/100L和0.016 dpm/100L以及0.061 dpm/100L和1.30 dpm/100L,最高值为井水,接下来为湖水最后为河水;总体上泉湾223Ra和224Ra 活度随离岸距离增加分别有由0.11到0.045 dpm/100L和0.2到1.4 dpm/100L的减小,垂向上Ra活度呈楔形分布,Ra活度在不同方向上的非保守性分布主要受到悬浮颗粒物解析的影响;通过水体滞留时间模型计算获得青海湖泉湾水体的平均停留时间为1.8天,进一步分析泉湾水体Ra的源汇项,应用镭同位素质量平衡模型获得泉湾布哈河口沿岸地下水排放通量为0.054~0.109 m3m-2d-1。
关键词:  青海湖  泉湾和布哈河口  223Ra和224Ra分布  地下水排放通量
DOI:
分类号:
基金项目:
Evaluation of the groundwater discharge and the spatial distribution of radium isotope in Quanwan bay of Lake QinghaiLake Qinghai
suwiegang,shazhanjiang,kongfancui,wangqiugui,maruying,liulei
1.Qinghai Earthquake Agency;2.Institute of Life and Geographical Science, Qinghai Normal University,
Abstract:
Lake Qinghai is an important part of the Qinghai-Tibet Plateau. It is important to maintain the ecological security in the northeast of Qinghai-Tibet Plateau. The discharge of groundwater directly affects the hydrobiogeochemical process of Lake Qinghai. This study were measured and analyzed the activity of Ra in the lake water, river water and groundwater in Quanwan Bay of Lake Qinghai in 2014. Discussed the distribution of activity of Ra in the horizontal and vertical lake water of Quanwan Bay in Lake Qinghai. Estimated the residence time of Quanwan water and the discharge flux of groundwater in the Buha Estuary. The activity values of 223Ra and 224Ra at different end elements are respectively 0.441 dpm/100L and 0.026 dpm/100L, 0.22 dpm/100L and 0.016 dpm/100L, 0.061 dpm/100L and 1.30 dpm/100L. The value of Ra from high to low was followed by groundwater, lake water and river water. In general, the activity of 223Ra and 224Ra in Quanwan bay were decreased with the increase of offshore distance from 0.11 to 0.045 dpm/100L and 0.2 to 1.4 dpm/100L, respectively. And the activity of Ra was presented wedge in the vertical of lake water. Ra activity in different directions of conservative distribution mainly affected by the suspended particle resolution; The average residence time of Quanwan Bay water was calculated by using the water retention time model, and the source and sink term of Ra in Quanwan Bay was further analyzed. The discharge flux of groundwater was 0.054 ~ 0.109m3m-2d-1 in the Buha Estuary which was calculated by the radium isotope mass balance model.
Key words:  Lake Qinghai  Quanwan Bay and buha Estuary  Distribution of 223Ra and 224Ra  The discharge flux of groundwater
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