云应盆地北部浅层地下水氢氧同位素特征分析

Characteristics of Hydrogen and Oxygen Isotopes of Shallow Groundwater in the North Area of Yunying Basin

区域氢氧同位素特征对于区域地下水来源具有非常重要的指示意义,可为正确评价与合理开发利用地下水资源地下水提供科学依据。以云应盆地北部的澴河河谷阶地为研究对象,分析了流域内不同含水层地下水中氢氧同位素特征,探讨了流域内浅层含水层之间的水力联系及其水循环特征。结果表明:研究区各含水层地下水样点主要分布在当地大气降水线的右侧,构成斜率明显小于大气降水线的蒸发线;不同含水层地下水中δD、δ18 O值的不同体现了研究区不同水体的水循环条件存在差异性;不同含水层蒸发线的斜率不同说明各含水层的蒸发强度不同,其蒸发强度与含水层的埋藏深度表现出一致性。

Regional hydrogen and oxygen isotopeshave indicates the regional source of groundwater,and provides a scientific basis for correct evaluation of groundwater resources and the rational exploitation and utilization of groundwater.Taking the Huan River valley terrace in the northern part of the Yunying basin as the research object,this paper analyzes the characteristics of hydrogen and oxygen isotopes in different aquifers,and discusses the hydraulic signatures and water cycle signatures of different aquifers in the research area.These results show that the water sampling points of different aquifers in the research area are mainly located on the right side of the local atmospheric precipitation line and constitute the evaporation line whose slope is obviously less than that of the atmospheric precipitation line.The different values of δD and δ^18O in different aquifers reflect the differences of water bodies in cycling conditions.The differences of slope Kof evaporation lines in different aquifers indicates that the evaporation intensity of each aquifer is different,and the evaporation intensity is in accordance with the buried depth of aquifer.