摘要
大气的蒸发效应引起土体内部含水量及温度的重新分布,本文旨在研究蒸发条件下非饱和土中水分及热量的迁移规律.对于土体在蒸发条件下总吸力和温度的变化特征,采用非饱和土水-热迁移模型加以描述,该模型中液态水和气态水的迁移分别是基于Darcy定律和Fick定律而建立的.探究了利用土体基本物性指标和气象因素预测模型计算中相关参数及边界条件的方法,利用上述模型及预测方法只需获取土体基本物理性质便可获取任意时刻非饱和土中含水量及温度的分布情况.该理论被用来模拟Wilson土柱蒸发试验实测结果,其理论结果和试验实测结果是较一致的.
Atmospheric evaporation influences the redistribution of soil moisture content and temperature. The aim of this paper is to study the migration regularity of soil moisture and heat under the conditions of unsatu- rated evaporation. A heat and water migration model for unsaturated soil was adopted to describe fundamental variation of total suction and temperature of unsaturated soil; in the model the migrations of liquid water and water vapour are respectively based on Darcy's law and Fick's law. The paper explores the use of soil basic physical property indexes and meteorological factors to predict model calculation related parameters and the boundary conditions. The distribution of soil moisture content and temperature can be easily got by the nu- merical model and method and the basic physical properties of soil. The above-mentioned theory is adopted to simulate the results of Wilson's indoor soil evaporation test; and the numerical simulation results show that the calculated results and measured results are in good agreement.
出处
《三峡大学学报(自然科学版)》
CAS
2014年第1期46-50,共5页
Journal of China Three Gorges University:Natural Sciences
关键词
蒸发效应
水-热迁移模型
总吸力
非饱和土
边界条件
evaporation
heat and water migration model
total suction
unsaturated soil
boundaryconditions