信江流域水化学与同位素地球化学特征  

Characteristics of Hydrogeochemistry and Isotope Geochemistry in Xinjiang River Basin

作　　者：方正 高柏[1,2] 林聪业 史天成 刘圣锋 丁燕 FANG Zheng;GAO Bai;LIN Cong-ye;SHI Tian-cheng;LIU Sheng-feng;DING Yan(School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学水资源与环境工程学院,南昌330013 [2]东华理工大学核资源与环境国家重点试验室,南昌330013

出　　处：《有色金属（冶炼部分）》2023年第1期138-145,共8页Nonferrous Metals（Extractive Metallurgy)

基　　金：江西省重点研发计划项目(2018ACG70023)。

摘　　要：为探究信江流域水化学特征,揭示流域内主要离子来源及其影响因素,共采集了82个地表水、地下水样,运用数理统计方法分析水化学组分特征,Piper三线图和舒卡列夫分类法划分水化学类型,Gibbs图法和岩石风化端元模型分析离子来源和影响因素,氢氧同位素特征判别水体补给来源及影响因素。结果表明,信江流域地表水和地下水中优势阳离子为Ca^(2+),优势阴离子为HCO_(3)^(-)、SO_(4)^(2-),pH呈中性(7.32)和弱碱性(8.88)。水化学类型均以HCO_(3)·SO_(4)-Ca、HCO_(3)-Ca型为主,地下水的水化学类型更丰富。水化学成因分析表明,地表水和地下水的主要控制因素是岩石风化作用,少量点位受人为因素影响。岩石风化端元模型进一步确定碳酸盐岩风化是研究区岩石风化的主导类型。氢氧同位素特征表明,信江流域地表水地下水均接受大气降水补给,地表水受蒸发作用影响最强,氢氧同位素分馏效应明显。地表水线和地下水线偏移明显,表明两者水力联系差。海洋性气团是信江流域水体的主要降水控制气团。In order to explore the hydrochemical characteristics of Xinjiang river basin,reveal the main ion sources and their influencing factors in the basin,total of 82 surface water and groundwater samples were collected.Mathematical statistical methods were used to analyze the characteristics of water chemical components.Piper three-line diagram and Shukarev classification method were used to divide water chemical types.Gibbs diagram method and rock weathering end meta-model were used to analyze ion sources and influencing factors.Hydrogen and oxygen isotope characteristics were used to identify water supply sources and influencing factors.The results show that the predominant cations in surface water and groundwater in Xinjiang river basin are Ca^(2+),the predominant anions are HCO_(3)^(-)and SO_(4)^(2-),and the pH value is neutral(7.32)and weakly alkaline(8.88).The hydrochemical types are mainly HCO_(3)·SO_(4)-Ca and HCO_(3)-Ca types,and the hydrochemical types of groundwater are more abundant.The analysis results of hydrochemical origin show that the main controlling factor of surface water and groundwater is rock weathering,and a small number of sampling points are affected by human activities.The rock weathering End-members diagram further determines that carbonate weathering is the dominant type of rock weathering in the study area.The hydrogen and oxygen isotope characteristics show that both surface water and groundwater in Xinjiang river basin are recharged by atmospheric precipitation,surface water is most affected by evaporation,and hydrogen and oxygen isotopes are most affected by evaporation.The isotope fractionation effect is obvious.The surface water line and the groundwater line are obviously offset,indicating that the hydraulic connection between the two is poor.The oceanic air mass is the main precipitation-controlling air mass in Xinjiang river basin.

关 键 词：信江流域 水化学组分 水化学特征 成因分析 氢氧同位素 

分 类 号：X522[环境科学与工程—环境工程]