摘要
本文利用可模拟自然环境的土壤热质迁移实验装置，就自然气候条件下风速、日照、大气温度与湿度等因素对土壤中水、盐、热等要素的一维动态迁移的影响进行了多种条件下的实验研究，揭示了土壤内温度、水分和盐分的分布动态与外界气候因素之间的联系，获得了土壤热质迁移过程中各主要参数的变化规律。对于本文实验中的砂土而言，发现土表以下存在吸水、过渡和释水三个自然分区，并分析了热渗透深度和平衡时间等主要的热质迁移特征，从而为各种理论模型提供了可靠的验证。
In this work, an experimental study on heat and mass transfer in unsaturated soil was conducted. The influences of the different factors such as air temperature, air velocity and heat radiation on the migration processes of heat moisture and salt were investigated. The dynamic distribution of temperature, moisture content and salt content in unsaturated soil under simulated climatic conditions was obtained. It is found that unsaturated soil can be divided into three regions as absorbing,transihng and releasing in moisture migrating process. The positions of different regions,the depth of heat infiltration and the equilibrium time for heat and mass transfer processes were determined.The results could be used to examine and correct the theoretical models of heat and mass transfer in soil.
出处
《土壤学报》
CAS
CSCD
北大核心
1998年第3期338-344,共7页
Acta Pedologica Sinica
基金
国家自然科学基金!39570410
关键词
传热传质
多孔介质
土壤
不饱和渗流
Heat and mass transfers,Porous media,Soils, Unsaturated flow
