利用盐分迁移函数模型研究入渗条件下土层的水盐动态  

The utilization of salt transfer function model in studying water-salt movements in soil layers under infiltration

作　　者：叶自桐[1] 

机构地区：[1]武汉水利电力学院

出　　处：《水利学报》1990年第2期1-9,共9页Journal of Hydraulic Engineering

基　　金：水利水电科学基金资助的"溶质在结构土层中的运移"课题

摘　　要：本文首先对Jury等的TFM一般方程进行了简化,导出了适于研究在入渗条件下描述盐分对流运移的TFM简化方程;根据田间高低不同矿化度水灌溉入渗试验结果和上述简化方程,得到了盐分通过0—60cm土层的时间概率分布函数P(t)及其相应的密度函数g(t—t’),同时还推求出有关描述土壤水非饱和流动和盐分对流运移特征的参数:如盐分通过所研究土层的平均时间t、水分在土壤孔隙中的平均流速V、土体中可动水体的平均含水率θ_m等,并对这些参数进行分析和讨论;最后指出了本文在理论方面的不足之处和尚待进一步探讨的问题.The general equation of transfer function model (TFM) developed by Jury et al is simplified in this paper and a simplified equation of TFM is introduced suitable for studying the salt movements under infiltration. The travel time probability distribution function P(t) and its density function g(t-t'), describing salt movements through soil layers of 0-60cm, are obtained from the simplified equation for irrigation water with different salinities in the field. Some parameters such as average travel time t of salt, average velocity v in pores, average water content of movable water θm, describing the charateristics of unsaturated water movement and convection transport of salt in soil layers are obtained. Some theoretical shortcomings in this research are also pointed out.

关 键 词：迁移 函数模型 土层 盐分 

分 类 号：TU441.2[建筑科学—岩土工程]