摘要
为深入研究藏东南拉月曲流域地表水水化学特征及其影响因素,在研究区采集地表水样品25组、收集雨水样品2组。运用Piper三线图、Gibbs模型、Ca/Na和TDS对数关系模型及相关性分析等方法对测试结果进行分析。结果显示:23组样品中,4种阳离子Ca^(2+)、Mg^(2+)、Na^(+)、K^(+)的平均值分别为13.90、1.43、1.65和1.56 mg/L,5种阴离子HCO_(3)^(-)、SO_(4)^(2-)、NO_(3)^(-)、Cl^(-)、F^(-)的平均值分别为27.57、14.88、2.92、5.40和0.24 mg/L,pH位于7.05~7.96,水体呈弱碱性。2组雨水样品中,4种阳离子Ca^(2+)、Mg^(2+)、Na^(+)、K^(+)的平均值分别为1.94、0.01、0.12和0.18 mg/L,5种阴离子HCO_(3)^(-)、SO_(4)^(2-)、NO_(3)^(-)、Cl^(-)、F^(-)的平均值分别为0.10、4.38、2.48、5.26和0.00 mg/L,pH位于7.56~7.60,雨水样品的阴阳离子含量均明显低于23组地表水样品的平均值。来自地下深处的2组温泉水样除NO_(3)^(-)含量显示为0.00 mg/L以外,阴阳离子含量明显高于23组地表水样的平均值。水化学类型为HCO_(3)-Ca型或HCO_(3)-Ca·Mg型,TDS与Ca^(2+)和HCO_(3)^(-)的相关系数分别为0.930、0.924。控制因素以岩石风化溶解作用为主、大气降水作用为辅,阳离子交替吸附作用和蒸发浓缩作用均相当微弱,地表水水文地球化学演化仍然处于自然演化阶段,人类活动干扰因素可忽略不计。地表水主要离子受到硅酸盐岩、碳酸盐岩风化溶解作用控制较强,蒸发盐岩风化溶解作用控制较弱。
In order to probe into the hydrochemical characteristics and influencing factors of surface water of the Layuequ River basin in southeast Tibet,samples of surface water(25 groups incl.two groups of hot-spring)and rainwater(two groups)were collected in the study area,and anions and cations in the water samples were measured.Analytic tools including the Piper triplex graph,Gibbs model,Ca/Na and TDS logarithmic relationship model and the correlation analysis were used to analyze the testing results.As a result,the analysis showed that the mean values of four cations(Ca^(2+),Mg^(2+),Na^(+)and K^(+))of the 23 groups(surface water except hot-spring)were 13.90,1.43,1.65 and 1.56 mg/L,respectively,and the mean values of the five anions(HCO_(3)^(-),SO_(4)^(2-),NO_(3)^(-),Cl^(-)and F^(-))were 27.57,14.88,2.92,5.40 and 0.24 mg/L,respectively,while pH values were in the range of 7.05-7.96,indicating that the water was weak alkaline.As for the two groups of rain-water samples,the mean values of four cations(Ca^(2+),Mg^(2+),Na^(+)and K^(+))were 1.94,0.01,0.12 and 0.18 mg/L,respectively,and the mean values of five anions(HCO_(3)^(-),SO_(4)^(2-),NO_(3)^(-),Cl^(-)and F^(-))were 0.10,4.38,2.48,5.26 and 0.00 mg/L,respectively,with pH values ranging from 7.56 to 7.60.So the contents of cations and ions in rain-water samples were markedly lower than the mean values of 23 groups surface water samples.On the other hand,the contents of anions and cations in two groups of hot-spring water from deep underground was significantly higher than the mean values of 23 groups surface-water samples,except for NO_(3)^(-)content(0.00 mg/L).For hydro-chemical type e.g.,HCO_(3)-Ca or HCO_(3)-Ca·Mg,the correlation coefficients of TDS versus Ca^(2+)and TDS versus HCO_(3)^(-)were 0.930 and 0.924,respectively.With respect to the control factors which were mainly the rock weathering and dissolution,supplemented by atmospheric precipitation,while the action of cations alternating adsorption and evaporation and concentration was very weak.Furthermore,the hydro-geochemical evolution of surface water was still in the natural evolution stage,and the interference factors of human activities could be ignored;the main ions contained in the surface water were rather strongly controlled by the weathering dissolution of silicate and carbonate rocks,but controlled by the weathering dissolution of evaporative rocks comparatively weak.
作者
邵杰
滕超
陈喜庆
杨欣杰
张泽琛
曹军
朱宁
肖登
孙思远
吕菲
SHAO Jie;TENG Chao;CHEN Xiqing;YANG Xinjie;ZHANG Zechen;CAO Jun;ZHU Ning;XIAO Deng;SUN Siyuan;LYU Fei(Cores and Samples Center of Natural Resources(CSCNR),China Geological Survey(CGS),Sanhe 065201,China;National Sichuan-Tibet Railway Technology Innovation Center,Chengdu 610200,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2023年第12期1-10,28,共11页
Environmental Science & Technology
基金
国家重大工程实物地质资料采集与应用服务(DD20221814)
实物地质资料采集更新与数字化应用(DD20230138)
国家地下水监测工程运行与维护(河北省秦皇岛地下水与海平面综合监测站运行维护)
作者简介
邵杰(1989-),男,工程师,硕士,主要从事水工环地质调查与研究工作,(电子信箱)313439358@qq.com;通讯作者:滕超,男,高级工程师,硕士,主要从事地质调查与研究工作,(电子信箱)275498009@qq.com。
