金华江城区段主要离子变化特征及来源辨析

Anflysis on Changes in Major ions of Jinhua Urban Section and Its' Source

为揭示金华江城区段主要离子变化特征及其来源,从2015年8月~2016年6月对金华江城区段进行连续11个月的观测分析,并结合降水量等数据,得到相关结论,河水离子总量的年内变幅较大,Ca^(2+)和Na^+浓度变化明显并表现出冬季高于夏季的特征,K^+,Mg^(2+),SO_4^(2-)和HCO_3^-浓度季节变化不明显,Cl^-浓度变化与流域降水量变化呈现一致性,同时各离子浓度在空间上也存在一定差异;经Gibbs图判别,研究河段离子组分来源以岩石风化为主,Ca^(2+),Mg^(2+)和HCO_3^-主要来自流域碳酸盐岩风化,Cl^-主要来源是通过大气带入并沉降在河水中的海盐,高浓度的SO_4^(2-)主要来自工业排水和酸沉降。

In order to reveal the changes in major ions of Jinhua urban section and its＂ source,we have monitored river waters in Jinhua urban section caves from August 2015 to June 2016.Combined with the local data of precipitation, we got the following conclusions,the total variation of river water was large in the year;the changes of Ca^2＋ and Na^＋ showed significantly higher in winter than in summer;, the seasonal variation of K^＋, Mg^2＋, SO4^2-; HCO3^- was not obvious;the overall trend was relatively flat ;Cl^- concentration and precipitation changes showed consistency; the ions concentration in space also had some differences, deducing form Gibbs graph, the main source of the river ions is rock weathering;Ca^2＋,Mg^2＋ and HCO3^- mainly come from the weathering of carbonate rocks; Cl^- mainly comes from atmospheric precipitation; high concentrations of SO4^2- are mainly derived from industrial drainage and acid deposition.