摘要
本文论述了室内无出流和补给时低含水率条件下土柱蒸发试验。用水、汽、热耦合模型计算了土壤蒸发过程中水、汽运动规律,并进行了验证。文中讨论了温度梯度对土壤水,汽运动的影响,以及低含水率条件下土壤蒸发时蒸发面下移的规律。
This paper describes an experiment of soil evaporation on a soil column under the condition of zero flux at the bottom and process of soil drying and forming of drylayer observed in the course of evaporation. A coupled numerical model of water-vapor-heat transport is used for computing soil water and vapor movement under the condition of soil evoporation. The solution of numerical model is verified by the experiment. The effects of soil temperal gradient on water-vapor transport and the pattern of downward movement of the evaporation face are also discussed.
基金
水利水电科学基金
关键词
土壤
蒸发
温度
水汽输运
soil evaporation
soil temperature
unsaturated flow
water vapor transport
numerical simulation
