摘要
运用主成分分析方法探讨了海水入侵对莱州湾东南岸地下水地球化学特征的影响。分析结果表明 ,第一主分量是海水入侵强度的量度 ,K+ 、Na+ 、Mg2 + 、SO42 - 、Cl- 的正向负荷量大 ,它们的增加意味着海水入侵的加剧 ,这间接表明可以用以上指标监测地下水的海水入侵。第二主分量是在第一主分量表示的海水入侵强度大致相同的情况下 ,可逆反应CaCO3 +CO2 +H2O Ca2 + +HCO3- 进行情况的量度。Ca2 + 、HCO3- 、pH在第二主分量上的负荷量最大 ,说明水中溶解的CO2 显著影响这三者的数值。Ca2 +与HCO3-负荷量的符号相反 ,说明两者在含量上是相互消长的。以相关系数为基础作聚类分析 ,K+ 、Na+ 、Mg2 + 、SO42 - 、Cl- 明显地聚为一组 ,而后三项指标之间的距离较大 ,并与上述Cl- -K+
This paper studied the effect of seawater intrusion on the ion hydrogeochemical characteristics of groundwater on the southeast coast of Laizhou Bay through pricipal component analysis. The conclusions as follows. The first principal component represents the intensity of seawater intrusion ints groundwater on southeast coast of Laizhou Bay. K+, Na+, Mg2+, SO42- and Cl- had higher positive loading than other ions,that is,the increase of these irons suggests seawater intrusion into on groundwater is worsening.Correlation coefficients between these irons or between each of the irons and salt concentration of groundwater are very significant. The second component stands for the condition of the reversible reaction CaCO3 + CO2 + H2OCa2+ + HCO3-.The reaction is controlled by CO2 concentration in the groundwater. Ca2+、HCO3- and pH had higher loading, which suggest that CO2 significantly affects these values. Ca2+ had negtive relation with HCO3-.Because of above characteristics, K+, Na+, Mg2+, SO42- and Cl- were naturally close to each other by clustering analysis of the correlation coefficient. But the distance between the ion and ion group is vary far.
出处
《海洋科学》
CAS
CSCD
北大核心
2004年第9期6-9,共4页
Marine Sciences
基金
国家自然科学基金资助项目 (40171037)
关键词
海水入侵
地下水
主成分分析
水文地球化学特征
莱州湾
seawater intrusion
groundwater
principal component analysis
hydrogeochemical characteristics
Laizhou Bay
