南水北调中线工程官山河水氢氧稳定同位素组成及影响因素  

Composition and Influencing Factors of Hydrogen and Oxygen Stable Isotopes in Guanshan River of the South-to-North Water Diversion Middle Route Project

作　　者：张乾柱[1] 金可 吴颐杭 罗袁 卢阳[1] ZHANG Qian-zhu;JIN Ke;WU Yi-hang;LUO Yuan;LU Yang(Chongqing Branch,Changjiang River Scientific Research Institute,Chongqing 400026,China;College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]长江科学院重庆分院,重庆400026 [2]重庆交通大学河海学院,重庆400074

出　　处：《长江科学院院报》2025年第2期179-187,203,共10页Journal of Changjiang River Scientific Research Institute

基　　金：武汉市2022年度知识创新专项-曙光计划项目(2022020801020245);国家自然科学基金项目(42407108);中央级公益性科研院所基本科研业务费项目(CKSF2023299/CQ,CKSF2021744/TB);国家重点研发计划项目(2021YFE0111900);湖北省水利科研项目(HBSLKY202405)。

摘　　要：官山河流域是丹江口水库的主要河流之一,是南水北调中线工程水源地的重要组成部分。系统分析了官山河流域河水氢氧稳定同位素组成和空间分布特征,探讨不同季节河水补给来源及其氢氧同位素影响因素。结果表明:官山河流域河水丰水期δD和δ^(18)O值相对枯水期偏正,丰水期和枯水期氘盈余值(d-excess)平均值分别为12.59‰和11.30‰。官山河流域河水线方程的斜率和截距与长江流域大气降水线极为类似,表明河水主要受长江流域大气降水补给影响,丰水期同位素组成偏正则主要受到降水与水岩作用的共同影响。流域内河水氢氧稳定同位素组成受多重因素影响,其中,沿程蒸发和高程效应对其影响最为显著。研究成果对官山河流域水文循环具有重要的指导意义。Guanshan River Basin is a major contributory source to the Danjiangkou reservoir and a critical component of the water source area of the South-to-North Water Diversion Project.The composition and spatial distribution of hydrogen and oxygen stable isotopes in Guanshan River Basin were comprehensively examined.The seasonal recharge sources of river water and the factors influencing hydrogen and oxygen stable isotopes were also investigated.Results reveal that δD and δ^(18)O are higher during flood season than in dry season,with average d-excess values of 12.59‰ and 11.30‰,respectively,for flood and dry season river water.The slope and intercept of the river water line equation in the Guanshan River Basin closely resemble those of the atmospheric precipitation line in the Yangtze River Basin,suggesting that river water is mainly recharged from atmospheric precipitation in the Yangtze River Basin.The isotopic composition during the flood season exhibits a positive signal,primarily influenced by both precipitation and water-rock interaction.The composition of hydrogen and oxygen stable isotopes of river water within the basin is influenced by multiple factors,with evaporation along the river course and elevation effects being the most significant.These research findings are of substantial significance for understanding the regional hydrological cycle within the Guanshan River Basin.

关 键 词：氢氧同位素组成 补给来源 影响因素 官山河流域 南水北调中线工程 水文循环 

分 类 号：P426[天文地球—大气科学及气象学]