山东省日照沿海浅层地下水化学特征与成因探讨

The chemical characteristics and causes of shallow groundwater in the Rizhao coastal area of Shandong province are discussed

日照地处山东省东南沿海,浅层地下水类型为第四系松散岩类孔隙水与基岩裂隙水。通过对日照市浅层地下水1984~1992年与2013年水化学资料进行分析对比,结果显示,从1980年以来,日常市浅层地下水水化学特征发生巨大变化,由HCO_3型或HCO_3·Cl型为主逐渐转化为NO_3^-、SO_4^(2-)型,出现NO_3-Ca·Na型水和NO_3·SO_4型水等更复杂类型地下水。且靠近沿海区域的地下水Cl-离子含量相对较高。分析认为,该特征形成原因是东南季风携带了海水气溶胶干降或随降水湿降所致。该区近年来硫酸盐及硝酸盐污染急剧加重,致使浅层地下水中的硫酸根含量剧增,使地下水水质受到严重污染,应引起足够重视。

The Rizhao is located along the southeastern coast of Shandong province,and the shallow groundwater type is the fourth line of the loose rock pore water and the rock crack water. The analysis and comparison of water chemical data from1984-1992 and 2013 were shown that,since 1980,a great change of the shallow groundwater hydrochemical characteristics in Rizhao,by mainly HCO3 type or HCO3 Cl type gradually transformed to NO3^-,SO4^2-,NO3-Ca·Na water and NO3SO4 type water more complex types of groundwater. And near the coastal area of groundwater,Cl-content is relatively high. The analysis suggests that this feature is caused by the fact that the southeast monsoon carries seawater aerosols dry or is caused by the decrease with precipitation. In recent years,the pollution of sulfate and nitrate has increased sharply,which results in a sharp increase of sulfate content in shallow groundwater and seriously polluted groundwater quality,which should be paid enough attention to.