摘要
通过采集闪电河流域2020年2月至2022年2月的降水与2021年的丰(8月)和枯(10月)水期的地表水和地下水,运用稳定同位素技术,对流域“三水”的氢氧稳定同位素进行时空变化分析,探讨水体同位素与环境因子的关系,结合HYSPLIT模型追踪大气水汽来源,利用端元混合模型揭示水体转换关系.结果发现,当地降水线的斜率和截距均小于当地大气降水线,水汽主要来自西风水汽、极地气团和东亚季风环流,降水同位素有显著的温度效应;时间上,地表水与地下水同位素在季节变化上均表现出枯水期较丰水期更富集,地表水与地下水d-excess值均低于全球平均值,显现出当地强烈的蒸发作用;空间上,地表水δ^(18)O值丰枯季节在空间上具有相同的变化特征,呈现上游至下游逐渐富集,地下水δ^(18)O高值区空间分布不均,地下水δ^(18)O值随埋深的增加更加贫化;地下水水线斜率最高在丰水期为7.87,与当地大气降水线和地表水水线斜率十分接近,表明丰水期“三水”存在复杂的水力联系.研究区在丰水期地表水主要接受降水的补给,其次是接受地下水的径流补给.研究结果有助于明确闪电河流域同位素变化特征反映的水文信息,为揭示干旱半干旱区水文循环提供理论依据.
In this study,we collected precipitation from February 2020 to February 2022 and the surface water and groundwater in the wet(August)and dry(October)periods of 2021 in the Shandian River Basin.Stable isotope technology was used to analyze the temporal and spatial changes in the hydrogen and oxygen stable isotopes of the"three waters"in the basin to explore the relationship between water isomorphs and environmental factors and to reveal the water conversion relationship using the end element mixing model.The results showed that the slope and intercept of the local precipitation line were smaller than the local atmospheric precipitation line.The water vapor mainly came from westerly water vapor,polar air mass,and East Asian monsoon circulation.The precipitation isotope had a significant temperature effect.In terms of time,the isotopes of surface water and groundwater were more enriched in the dry season than those in the wet season,and the d-excess values of surface water and groundwater were lower than the global average,indicating strong local evaporation.Spatially,the δ^(18)O value of the rivers had the same change characteristics in the wet and dry seasons,showing gradual enrichment from the upstream to the downstream,and the groundwater δ^(18)O high value area was unevenly distributed in space,with groundwater δ^(18)O values becoming more depleted with the increase in burial depth.The highest slope of the groundwater water line was 7.87 in the wet season,which was very close to the slope of the local atmospheric precipitation line and river water line,indicating that there was a complex hydraulic connection between the"three waters"in the wet season.The surface water in the study area was mainly supplied by precipitation during the wet season and then by groundwater runoff.These results can provide a theoretical basis for revealing the hydrological cycle in arid and semi-arid areas.
作者
杨丽娜
贾德彬
高瑞忠
苏文旭
卢方园
郝玉胜
YANG Li-na;JIA De-bin;GAO Rui-zhong;SU Wen-xu;LU Fang-yuan;HAO Yu-sheng(Institute of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot 010010,China;Key Laboratory of Water Resources Protection and Utilization,Hohhot 010010,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2023年第7期3855-3863,共9页
Environmental Science
基金
国家自然科学基金项目(51869018,52169003)。
关键词
闪电河流域
降水
氢氧同位素
地下水与地表水
水体转换
Shangdian River Basin
precipitation
hydrogen and oxygen isotopes
groundwater and surface water
water conversion
