摘要
在寒区,关于冻结层上包气带边界特征的分析一直备受人们关注。在充分梳理既有研究成果的基础上指出:冻结层上包气带一般指的是位于地表与冻结层上地下水之间岩层圈最顶部的地带;包气带的分类依据冻土和地貌条件划分;在包气带边界处,岩层中的孔隙气体会和大气圈进行交换;冻结层上包气带水分迁移的影响因素有水分饱和差和热梯度差。
Analysis of vadose zone boundary characteristics in frozen layer has been drawing people＇s attention in cold regions.On the basis of combing research results adequately,this paper points out：Vadose zone in frozen layer generally refers to the topmost zone in rock layer between the surface and the groundwater in frozen layer;The classification of vadose zone can be divided according to permafrost and landform condition;The pore gas in the rock layer can be exchanged with the atmosphere circle on the border of the vadose zone;The influence factors about vadose zone moisture migration in frozen layer are saturated moisture difference and thermal gradient difference.
关键词
冻结层
包气带
边界特征
水分迁移
寒区
frozen layer
vadose zone
boundary characteristics
moisture migration
cold regions
