三工河流域氢氧同位素特征及其水循环意义

Features of Hydrogen and Oxygen Isotopes and Their Indication of Hydrological Cycle in Sangong River Basin of Xinjiang

以新疆三工河流域为研究对象,通过对地表水、浅层地下水及深层地下水采样,分析δD、δ^(18)O及氘过量参数d的分布规律,得到地表水及地下水之间的转换关系。结果表明:山区降水是研究区内水体的主要补给源;降水向地表水转化过程中,受蒸发作用影响较弱;地表水在出山口入渗补给地下水过程中,经历了较强的蒸发作用,地表水入渗地下后,一部分转入深层地下水,一部分转入浅层地下水,地表水对地下水的补给贡献量所占的比例为78.0%;深层地下水与浅层地下水水力联系较密切,在平原区深层地下水逐渐向浅层地下水运移排泄;浅层地下水主要受地表水、灌溉水补给,少量受大气降水补给,受蒸发作用影响强烈。

Based on samples of the surface water,groundwater in shallow aquifer and groundwater in deep aquifer,the paper analyzed the distribution of isotope features of hydrogen and oxygen and deuterium excess( d) in Sangong River basin and the interaction between surface water and groundwater was obtained. The results indicate that all waters are mainly derived from the snow melting water and rainfall; And the surface water is evaporated for short time before the surface water infiltration to the groundwater. Evaporation effect is obvious during the surface water infiltration to the groundwater. There is a close interaction between the shallow groundwater and deep groundwater,and it can be regarded as one unified groundwater system. The deep groundwater transports to the shallow groundwater in the flood plain area. In addition to a small amount of atmospheric precipitation recharge,the shallow groundwater is recharged chiefly by the surface water and irrigation water and is evaporated obviously.