非饱和土壤导水参数的推求 Ⅰ:理论  

DETERMINATION OF THE HYDRAULIC CONDUCTIVITY AND WATER DIFFUSIVITY IN UNSATURATED SOILS 1, THEORY

作　　者：邵明安[1] 

机构地区：[1]中国科学院水利部西北水土保持研究所

出　　处：《中国科学院水利部西北水土保持研究所集刊》1991年第1期13-25,共13页

摘　　要：本文根据—维非饱和土壤水分的垂直入渗再分布和水平扩散再分布,采用土壤湿润剖面平均湿度和湿润锋湿度之间函数关系的三种形式,分别推导出非饱和土壤导水率,水分扩散率,比水容量的解析表达式,解析表达式中仅有四个独立参数,均可通过实验数据的简单拟合而得到。与其它方法相比,这种新的推求方法具有花费少、准确度高和测定范围大等特点。Three simple equations for the relatioships beLween the water content at wetting front and the average water content in the wetting zone, during the redistributions of soil water in unsaturated soils both vertically and horizontally, are described in this paper. Based on both vertical infiltration and horizontal diffusion of soil water in unsaturated soils, analytical expressions for hydraulic conductivity, water diffusivity and specific water capacity were derived. The resulting expressions for the three hydraulic parameters contain four independent parameters which can be obtained by fitting the proposed equations to experimental data. Compared with previous methods of predicting hydraulic conductivity and water diffusivity, the new method in this paper has advantage of less time-consuming and expensive, more accurte and wider range of application over them.

关 键 词：非饱和土壤导水率 水分扩散率 比水容量 

分 类 号：S157[农业科学—土壤学]