摘要
为揭示在蒸发条件下非饱和土中水分的运动规律,进行了一维土柱非饱和蒸发室内试验,并采用湿/热耦合的非等温渗流方程对蒸发条件下土壤水分的运动规律进行了数值模拟,通过将数值计算结果与试验结果进行对比,验证了湿/热耦合的非等温渗流方程的可靠性,同时发现干土层的形成是引起土壤水分运动形式发生转变的根本原因,即在干土层形成前,土壤内水分的运动以液态流动形式为主;在干土层形成后,干土层以下土壤的水分仍以液态流动形式向上运移,在干土层内则是以水蒸气扩散的形式向大气运动。
Unsaturated evaporation test of one-dimensional soil column is conducted to study the migration regularity of soil moisture and heat under the conditions of unsaturated evaporation. And a coupled model o{ heat-moisture aniso- thermal flow is used to simulate the movement laws of soil water content under the condition of evaporation. The reliabili- ty of numerical model is verified by the evaporation test. It indicates that the formation of dry soil is the basic reason for changing the form of soil water movement; before the formation of dry soil, the soil moisture moved in the form of liquid phase~ after the formation of dry soil, the soil moisture under the dry soil moved still in the form of liquid phase; but in the interior of dry soil, the soil moisture diffused into the atmosphere in the form of water vapor.
出处
《水电能源科学》
北大核心
2013年第11期155-158,187,共5页
Water Resources and Power
基金
国家自然科学基金资助项目(51178251)
关键词
非饱和蒸发
湿
热耦合
水分运动
干土层
水蒸气扩散
unsaturated evaporation
coupled heat-moisture
moisture movement
dry soil
water-vapor diffusion
