摘要
苏干湖盆地在我国干旱内陆盆地中具有典型盐渍化湿地生态系统,探究盆地内地下水形成演化机制对该地区湿地生态系统的保护至关重要。基于苏干湖盆地多年地下水氢氧稳定同位素(δ2H、δ18O)和氘盈余d值数据,采用相关性分析与空间插值法,分析了地下水氢氧稳定同位素组成特征,识别了地下水的主要补给来源,解析了地下水稳定同位素组成的空间变化规律,揭示了区域水文循环过程。结果表明:(1)研究区周围高海拔山区的大气降水是苏干湖盆地地下水的主要补给来源;(2)地下水中δ2H、δ18O与d值分别为-105.87‰~14.61‰、-13.93‰~-0.17‰及-2.62‰~18.1‰,区域空间上δ2H与δ18O表现为东南富集、西北贫化的特征,而d值则具有东高西低特征;(3)补给来源、混合作用及蒸发作用影响着地下水氢氧同位素的空间分布特征;(4)研究区东部地下水主要接受山区地下水侧向径流与河水渗漏补给,西北部地下水主要来自山区地下水的侧向径流补给。研究结果可为研究区水资源的可持续管理与生态环境保护提供科学支持。
Sugan Lake Basin is a typical salinized wetland ecosystem in China s arid inland basins,so exploring the formation and evolution mechanism of groundwater is of vital importance for the protection of the wetland ecosystem in the study area.Based on the stable isotope compositions of hydrogen and oxygen(δ2H,δ18 O)and d-excess in the groundwater of Sugan Lake Basin,the authors adopted correlation analysis and spatial interpolation method to analyze the compositions characteristics of oxygen and hydrogen isotope of groundwater and identify the main recharge sources of groundwater.The spatial variations of stable isotope in groundwater were also decomposed and regional hydrological cycle processes were revealed.The results were concleded as follows:①The atmospheric precipitation in the high-altitude mountainous areas surrounding the study area served as the primary recharge source for groundwater in Sugan Lake Basin.②The values ofδ2H,δ18 O and d of groundwater were-105.87‰to 14.61‰,-13.93‰to-0.17‰and-2.62‰to 18.1‰,respectively.Spatially,δ2H andδ18 O show the enrichment characteristics in the southeast and depletion in the northwest,while d had the feature of being higher in the east and lower in the west.③The spatial distribution characteristics of hydrogen isotopes of groundwater were affected by the sources of recharge,mixing and evaporation.④Groundwater in the eastern part of the study area was mainly recharged by the mountain groundwater lateral runoff and river water seepage,while the groundwater in the northwestern part was mainly recharged by the mountain groundwater lateral runoff.The results could provide important scientific support for the sustainable management of water resources and ecological environment protection in this area.
作者
谷瑜
韩涤清
宁佳
刘喜梅
王金金
GU Yu;HAN Diqing;NING Jia;LIU Ximei;WANG Jinjin(Prevention and Control Center for the Geological Disaster of Henan Geological Bureau,Zhengzhou Henan 450012,China;Henan Engineering Research Center of Geo-environment Protection and Ecological Restoration,Zhengzhou Henan 450012,China)
出处
《中国地质调查》
2025年第6期88-96,共9页
Geological Survey of China
基金
河南省地质矿产勘查开发局“黄河下游中牟段水循环及其湿地生态系统保护与恢复研究(编号:豫地环[2022]4号)”
河南省水利厅“周口市中深层地下水可更新能力评价(编号:SCBZXSZYK-2025-167)”项目联合资助。
关键词
地下水
氢氧稳定同位素
水文循环过程
苏干湖盆地
groundwater
hydrogen-oxygen stable isotopes
hydrological cycle process
Sugan Lake Basin
