青海湖沙柳河流域浅层地下水氢氧稳定同位素分布特征

doi:10.7522/j.issn.1000-694X.2018.00101

摘要/Abstract

摘要： 地下水氢氧稳定同位素的组成与空间分布规律可为研究地下水补给及深入认识水循环过程提供重要理论依据。基于青海湖沙柳河流域浅层地下水样品的氢氧稳定同位素数据，通过空间插值法和δD-δ¹⁸O线性关系法，分析了氢氧稳定同位素组成、空间分布特征及地下水补给关系。结果表明：沙柳河流域中下游地区浅层地下水δ¹⁸O与δD值分别为-8.54‰~-6.02‰和-58.6‰~-34.6‰，平均值分别为-6.79‰和-41.8‰；δ¹⁸O值在流域空间上表现为西北、中部高，南北低的特征；流域西北和中部地区地下水主要受降水补给，补给来源单一、蒸发作用强是该区域地下水同位素值较高的原因，降水→地下水→泉水是其主要补给、排泄关系；流域北部、南部地区地下水与降水、河水、泉水等水体水力联系密切，不同补给来源的平滑作用是该区域地下水同位素值较低的原因，其补给、排泄关系主要为降雨→河水→地下水→泉水（或降雨→地下水→泉水→河水）。

关键词: 氢氧稳定同位素, 地下水, 空间分布, 补给来源, 青海湖, 沙柳河流域

Abstract: The composition of hydrogen and oxygen stable isotopes and spatial distribution regulation in groundwater can provide important theoretical basis for the study of groundwater recharge and better understanding of water circulation. Hence, based on shallow groundwater samples collected in the Shaliu River basin of Qinghai Lake and their corresponding hydrogen and oxygen isotopic compositions (δD, δ¹⁸O) and d-excess data, this paper uses the spatial isolation method and δD-δ¹⁸O linear relationship method to study the stable isotope composition, spatial distribution characteristics and groundwater recharge relationship. It turned out that the δ¹⁸O and δD values of shallow groundwater range respectively are -8.54‰~-6.02‰ and -58.6‰~-34.6‰, with average values respectively of -6.99‰ and -41.8‰ in the middle and lower reaches of Shaliu river. In addition, the δ¹⁸O value is spatially characterized by high altitude in the northwest and middle and low in the north and south. Finally, groundwater is mainly recharged by precipitation in the northwest and central regions, which relationship with river water supply is not obvious. However, the high groundwater isotope values due to single source of recharge and strong evaporation in this region, which relationship between recharge and excretion is mainly of precipitation→ groundwater→ spring water. It is also find that the groundwater is closely related to the water bodies such as precipitation, river water and spring water in the northern and southern parts of the basin, and the low groundwater isotope values in this region because of the smoothing effect of different supply sources, which relationship between recharge and excretion is mainly of precipitation→river water→groundwater→spring water or precipitation→groundwater→spring water→river water.

Key words: hydrogen and oxygen stable isotopes, groundwater, spatial distribution, recharge source, Qinghai Lake, Shaliu River basin

中图分类号:

P641.3

杨羽帆, 曹生奎, 冯起, 曹广超, 刘英, 雷义珍. 青海湖沙柳河流域浅层地下水氢氧稳定同位素分布特征[J]. 中国沙漠, 2019, 39(5): 45-53.

Yang Yufan, Cao Shengkui, Feng Qi, Cao Guangchao, Liu Ying, Lei Yizhen. Spatial Distribution Characteristics of Composition of Stable Hydrogen and Oxygen Isotopes of Shallow Groundwater in Shaliu River Basin of Qinghai Lake[J]. Journal of Desert Research, 2019, 39(5): 45-53.

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