【摘要】 分析了盐分在土壤中的动态迁移特征及其影响因素,综合运用多孔介质热、质传递理论,考虑温度效应对土壤湿分迁移的影响以及不动水体与盐分吸附或解吸作用,建立了全面描述土壤中水、热、盐耦合运移的数学模型并进行相应的数值研究,获得土壤中水、热、盐的动态迁移特性,探讨了土壤质地对盐分运移的影响,以期为土壤次生盐渍的防治提供有效的理论指导.模拟结果表明:盐分运移受土壤质地与结构的影响较大,并与土壤水分运移密切相关.更多还原

【Abstract】 The dynamic characteristics of soil salt migration and its influential factors were analyzed.On the basis of theories of solute transport and heat and mass transfer in porous media and in consideration of the temperature effect on soil moisture transport and absorption-desorption and mobileimmobile region,the mathematical model for moisture,heat and salt transport was described and numerical research conducted.The dynamic characteristics for moisture,heat and salt transport in soil were obtained.The effect of soil properties on salt migration was analyzed,expecting to provide theoretical guidance for preventing and curing soil salinization.Simulation results indicated that salt transport was affected by soil properties,soil structure,and closely related with soil water migration.更多还原