| 牟汶河中上游孔隙水化学特征及控制因素 |
| 摘要点击 2554 全文点击 852 投稿时间：2022-04-14 修订日期：2022-06-07 |
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| 中文关键词 牟汶河 离子来源 水化学 化学风化 水文地质 |
| 英文关键词 Mouwen River ion source hydrochemistry chemical weathering hydrogeology |
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| 中文摘要 |
| 为研究牟汶河中上游孔隙水水化学特征及离子来源，在牟汶河中上游莱芜盆地采集了孔隙水样品29组，综合利用相关性和主成分分析、Piper三线图和Gibbs图集离子比值等方法，分析了该区孔隙水主要离子特征及其控制因素，揭示了该区孔隙水中的主要物质来源.结果表明，牟汶河中上游孔隙水阴阳离子以HCO3-、NO3-、SO42-和Ca2+为主；以TDS>1000 mg ·L-1为标准，正常值点水化学类型主要为HCO3 ·NO3 ·SO4-Ca和HCO3 ·SO4-Ca ·Mg型水，异常值点水化学类型主要为NO3 ·Cl-Ca型水.地下水化学演化过程主要受岩石风化、阳离子交替吸附和人类活动影响，Na++K+主要来自硅酸盐风化溶解作用，HCO3-、Ca2+和Mg2+来自以方解石为主要矿物的碳酸盐岩风化及碳酸和硫酸参与的溶解作用；阳离子交替吸附与硅酸盐岩的风化作用为孔隙水提供了盈余的Ca2+和Mg2+；生活污水混入、农业种植活动和铁矿煤矿开采等工矿活动改变着孔隙水化学成分，特别是NO3-超标现象，已成为当地地下水化学环境的主要问题. |
| 英文摘要 |
| In order to study the hydrochemical characteristics and ion sources of pore water in the middle and upper reaches of the Mouwen River, 29 groups of pore-water samples were collected in the Laiwu Basin. The main ion characteristics and their controlling factors of pore-water in this area were analyzed by using correlation and principal component analysis, Piper trigram, and Gibbs diagram methods. The main material sources of pore water in this area were revealed. The results showed that HCO3-, NO3-, SO42-, and Ca2+ were the main anions and cations in the pore water of the middle and upper reaches of the Mouwen River. With TDS >1000 mg·L-1 as the standard, the normal water chemistry type was mainly HCO3·NO3·SO4-Ca and HCO3·SO4-Ca·Mg, whereas the abnormal water chemistry type was mainly NO3·Cl-Ca. The chemical evolution of groundwater was mainly influenced by rock weathering, cation alternation adsorption, and human activities. Na++K+ mainly came from silicate weathering and dissolution, and HCO3-, Ca2+, and Mg2+ came from calcite weathering and dissolution involving carbonate and sulfuric acid. Alternation adsorption of cations and weathering of silicate rock provided a surplus of Ca2+ and Mg2+ for pore water. Industrial and mining activities such as domestic sewage mixing, agricultural planting activities, and iron and coal mining changed the chemical composition of pore water, especially NO3- exceeding the standard, which has become the main problem of the local groundwater chemical environment. |
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