用对流扩散方程确定非饱和土壤水动力弥散系数

The Determination of Dispersion Coefficient by Convective Dispersive Equation

用非饱和土壤水动力弥散方程及其解析解 ,在室内试验的基础上 ,研究了非饱和土壤在不同初始含水量、不同入渗方式及不同加肥方式下的水动力弥散系数。研究结果表明 :土壤初始含水量、灌水方式对非饱和土壤水动力弥散系数影响大 ,而加肥方式对土壤水动力弥散系数影响小。所述方法 ,理论性强 ,概念清楚明潦 ,试验操作简便 。

Using the convective dispersive equation and based on laboratory experiment, the hydrodynamic dispersion coefficient of unsaturated soil is determined under different inial soil water content, different manner of water infiltration and fertilizer supply. The results indicate that the inial soil water content and the manner of water supply affect the dispersion coefficient deeply, but the manner of fertilizer supply does not affect it. The method has the advantages of having a higher theoretical level, being clearer in concept and more simple in operation.