两种包气带类型的浅层地下水水化学特征对比研究

Contrastive Studies of Hydrochemical Characteristics of Shallow Groundwater between Two Different Vadose Zones

通过对安徽太和地区地下水调查及样品测试分析,发现近二十年来该地区地下水水化学类型已由简单变为复杂,HCO3-Ca型水分布范围明显减少甚至消失,HCO3-Ca·Mg型水分布范围增大,河间地区以HCO3-Na型水为主,且分布范围有继续增大的趋势。亚黏土包气带类型和亚砂土包气带类型地下水化学类型明显不同,后者水化学类型的变化要大于前者,且后者TDS含量也比前者要低。亚砂土截污能力较亚黏土弱,因此该包气带类型地区更要注意防止地下水污染。

By investigating and analyzing the groundwater samples in Tat-he area ot ~nnut t＇rovtttce, tt ta tuu J cal types in this region have become from simple to complicate in recent 20 years, the distribution area of the HCO3-Ca type reduces significantly or even disappear, while the HCO3-Ca. Mg type water distribution area increases. The main hydro-chemical types between rivers.are HCO3-Na, which has continued increasing trend. Loam vadose zone type and sandy loam vadose zone type have significantly different chemical types of groundwater, the changes of water chemistry type in the latter is greater than that in the former, and the TDS content in the latter is lower than that in the former. Silty clay sand has more interception capability than clay, therefore more attention should be paid in sandy loam vadose zone type area to prevent groundwater pollution.