棕壤盐水入渗水分运移特征研究

Features of Infiltration Water Migration in Brown Soil with Saline Water

采用水平土柱,以质量浓度5%的KCl溶液作为入渗液,并以耕层棕壤为供试材料,测定了不同入渗时间下的水分运移特征。结果表明,累积入渗量与时间呈幂函数关系,随入渗时间的延长,累积入渗量增大但增幅减小;累积入渗量与湿润峰运移距离呈线性关系,随湿润峰运移距离的增大,累积入渗量亦增大;湿润峰运移距离与入渗时间呈幂函数关系,随入渗时间的延长,湿润峰运移距离增大但增幅减小;盐溶液入渗情况下,棕壤的吸湿率约为162.38 cm/h;水分入渗率与时间呈幂函数关系,初始入渗时段入渗率下降速度快,随后入渗率随入渗时间的延长而缓慢下降。

Taking topsoil brown soil as the experimental material,horizontal soil column is used to test the migration law of water in different infiltration periods with 5 percent of mass concentration of KCl infiltrated solution.The experimental results demonstrate that the relationship between cumulated infiltration and measured infiltration time is power function.As the infiltration duration prolong,the cumulative infiltration increases while the increasing amplitude of infiltration capacity decreases.The relation...