土壤非饱和导水率机理的探讨

Characteristic function of soil moisture and analytical solution of richards equation

本文从土壤微观结构的统计学角度出发，提出各向均－土壤孔径统计分布曲线的幂函数表达式．由此论证了土壤非饱和导水率随含水率而变的统计特征和物理机理，导出了相应函数关系．用文献［１］提供的萨庇（Ｓａｒｐｙ）壤土和吉里（Ｇｅａｒｙ）粉壤土实验成果，对上述关系做了验证．

From the statistical microconstruction point of view, a statistical distribution expression with power function from of homogenous soil pore is proposed; the physical mechanism of the relation ship between the soil moisture and transmissivity is demon atrationed. The analytical solution of Richards equation for one dimensional horizontal seepage flow in the condition of water supplied sufficently and the qvasi-analytical solution for one dimensional vertical seepage flow are derived. The relationship and solutions have been verified by experimental results for Sarpy loam and Geay fine-loam.