洛河干流枯水期水化学空间分布特征  

Spatial Distribution Characteristics of Hydro-chemistry in Stem Stream of Luo River During Dry Season

作　　者：原名扬 郭晓明[1] 刘越 禹洋 王冰冰 赵同谦[1] YUAN Mingyang;GUO Xiaoming;LIU Yue;YU Yang;WANG Bingbing;ZHAO Tongqian(School of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]河南理工大学资源环境学院,河南焦作454000

出　　处：《环境科学与技术》2024年第11期118-126,共9页Environmental Science & Technology

基　　金：国家自然科学基金项目(U23A2016)。

摘　　要：洛河是黄河(河南段)最大的一级支流,沿岸加剧的人类活动深刻影响着洛河的水化学特征,从而制约着流域经济社会的可持续健康发展。该文以洛河为研究对象,在洛河干流(洛阳-巩义段)设置11个采样点,于枯水期(2023年12月)采集河水样品,研究水中盐分(K^(+)、Ca^(2+)、Na^(+)、Mg^(2+)、Cl^(-)、SO_(4)^(2-)和HCO_(3)^(-))和营养元素(总溶解性氮、总溶解性磷和总溶解性碳)的空间分布特征。结果表明,水体呈弱碱性,总矿化度为282~448 mg/L,水化学类型为HCO_(3)-SO_(4)-Ca-Mg;层次聚类法分析表明盐分和营养元素含量从上游到下游可划分为3个分区,Ⅰ区(洛宁县-宜阳县郊)含量相对较低,而Ⅱ区和Ⅲ区(宜阳县城-洛阳市区-巩义)含量相对较高;Gibbs模型等表明盐分离子主要受到硅酸盐岩风化的影响;总溶解性氮浓度(3.27 mg/L)超过国家地表水环境质量的Ⅴ类水标准,其组分以硝态氮为主(占比78.05%);流域内土地利用类型和相关性分析表明其主要受农业生产活动和城市生活污水影响。研究结果可为洛河流域的地表水环境质量保护提供理论依据。The hydro-chemical characteristics of Luo River,the largest first-class tributary of the Henan reach of the Yellow River,were significantly influenced by the intensified human activities,which restricted the sustainable and healthy economic and social development of the the River-basin.In this study,river-water quality monitoring was carried out with 11 sampling points being set up in the stem stream of the River(Luoyang-Gongyi reach),and the water samples were collected during the dry season(December,2023)to study the spatial distribution characteristics of salinity(K^(+),Na^(+),Mg^(2+),Cl^(-),SO_(4)^(2-)and HCO_(3)^(-))and nutrients(total dissolved nitrogen,total dissolved phosphorus and total dissolved carbon).The results of the monitoring showed that in general,the river-water was weakly alkalic,and total mineralization was equal to 282~448 mg/L with hydrochemistry type being HCO_(3)-SO_(4)-Ca-Mg.The results of hierarchical clustering indicated that with respect to the content of sa⁃linity and nutrient,the River-reach was divided into three zones from upstream to downstream,i.e.,relatively low content in ZoneⅠ(Luoning County-Yiyang County’s suburb)and relatively high content in ZoneⅡand ZoneⅢ(Yiyang County-Luoy⁃ang urban area-Gongyi City).By using Gibbs image model it was showed that salinity ions were mainly affected by weather⁃ing of silicate rocks;the concentration of total dissolved nitrogen was as high as 3.27 mg/L exceeding the GradeⅤof the Envi⁃ronmental Quality Standard for Surface Water,its main component being nitrate nitrogen(accounting for 78.05%).Further⁃more,the land-use type and correlation analyses indicated that the content of total dissolved nitrogen was mainly affected by agricultural activities and urban domestic wastewater discharge within the River Basin.The achievements of the study could be used as a theoretical basis for the protection of water quality in the River Basin.

关 键 词：洛河流域 水化学 盐分 营养元素 总溶解性氮 硝态氮 

分 类 号：X52[环境科学与工程—环境工程]