摘要
在1980—2009年北运河水质监测资料的基础上,综合运用数学统计、三角组分图、Gibbs图等方法,分析研究了北运河流域长达30年时间内地表水化学特征变化趋势。结果表明,HCO3-和Ca2+在河水中质量浓度相对稳定,绝对值较大,分别是决定河水水化学特征的最主要阴、阳离子。1991年与2006年河流中水化学离子相关性差异较为明显,水化学特征略有不同,近年来河流水化学特征随季节变化变异性略有增大,受人类活动的影响而改变了其主要地球化学离子自然特征。离子强度、Cl-、SO24-、Na+和NH4+呈现较为明显的上升趋势,其中离子强度和NH4+质量浓度上升趋势尤其显著;pH值总体变化趋势相对比较平稳;HCO3-质量浓度和总硬度/总碱度呈现下降趋势。北运河流域河水离子自然起源的优势机制是碳酸盐岩石的风化作用,大气降水的输入和"蒸发-结晶"作用比较微弱。
An analytical study on the tendency of the surface water chemical characteristics basin had been carried out by the mathematical statistics,the ternary diagram and the Gibbs diagram,based on the water quality monitoring data in the Beiyunhe River Basin during the period from 1980 to 2009.The results showed that the contents of HCO-3 and Ca2＋ in river were relatively stable and their absolute values were lager.HCO-3 and Ca2＋ were respectively the most dominant anion and cation,which determined water chemical characteristics.The ion correlation diversity in river was obvious during the 1991＇s and 2006＇s.The variability of water chemical characteristics increased with the reason.The natural content of the major geochemical ion varied under the influence of human activity.The variance of ionic strength,Cl-,SO2-4,Na＋ and NH＋4 showed obvious upward tendency,especially the ionic strength and NH＋4.The variance of pH value was steady.HCO-3 and the ratio of total hardness to alkalinity showed slightly downward tendency.The major origin of water ions in the Beiyunhe River Basin was weathering of carbonate rocks.The precipitation inputs and evaporation-crystallization were very weak.
出处
《灌溉排水学报》
CSCD
北大核心
2012年第5期82-86,107,共6页
Journal of Irrigation and Drainage
基金
国家973项目(2010CB428801)
北京市优秀人才培养基金(PYZZ090419001989)
北京市科技计划项目(D07050601510000)
关键词
北运河
地表水
水化学
离子
Beiyunhe River Basin
surface water
water chemical
ion
