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Changes of δ18O and δD along Dousitu River and its indication of river water evaporation
Author(s): 
Pages: 107-112
Year: Issue:  1
Journal: HYDROGEOLOGY & ENGINEERING GEOLOGY

Keyword:  都思兔河同位素流量变化蒸发比例;
Abstract: 本文在对都思兔河流域水文地质条件进行介绍的基础上,根据实测结果对河流量及δ18O和δD沿流程的变化进行了讨论,分析了其变化机理.结果表明都思兔河流量沿流程的变化与地下水等水位线及河水与地下水的补排关系吻合很好.把河水的氢氧稳定同位素成分与流域内其他水体的成分进行比较发现,河水明显受蒸发作用的影响.河水同位素成分的变化主要由地下水的补给及河水的蒸发两种作用共同引起,地下水的补给使河水的δ18O和δD减小,河水的蒸发则使其同位素成分增大.文章使用Rayleigh平衡分馏方程对河水的蒸发比例进行了计算,结果表明,河水的累计蒸发比例可达20%~48%.
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