【作者】 马东豪； 王全九；

【Author】 MA Dong-hao,WANG Quan-jiu (Xi’an University of Technology, Xi’an 710048,China;Key Ub. Of Soil Erosion and Dry land, Yangiing 712100,China)

【机构】 西安理工大学； 西安理工大学土壤侵蚀与旱地农业国家重点试验室；

【摘要】 考虑不动水体的影响,两区模型改善了对洛质穿透曲线的描述,尤其是优先流情况下溶质穿透曲线的描述。同样考虑了不动水体,毛管束模型把洛质运移与水分特征曲线联系起来,得到了形式简单的通量浓度的表达式。不动水体是影响两区模型计算精度的重要参数。本文讨论了现有的确定不动水体含量的几种方法,并对两区模型与毛管束模型的不动水体进行了比较分析。结果表明,对于对流作用占优的粉砂性土壤,可以认为两模型中的不动水体是一致的;而对非结构的壤土和质地粘重的土壤,这种等价会产生一定的误差。更多还原

【Abstract】 Considering the effects of i mmobile water content, the mobile-i mmobile domain model improves the description of the soil solute breakthrough curves, especially for the situation wit the preferential flows. A simple relation, describing soil solute breakthrough curve, is given by the capillary bundle model relating solute transport with soil water characteristic curve, which includes residual water content. I mmobile water content is an important parameter affecting the precision of predicting soil solute concentration through two-region model. Several methods of determining i mmobile water content are discussed in this paper. Analytical comparison is also carried out, between the i mmobile water content of two-region model and that of capillary bundle model. The results show that the i mmobile water content of the two models can be regarded the same for sand soils where convection role dominates, while such equality will cause considerable error for heavy-textured soils and unstructured soils where mass exchange and dispersion may be in the ascendant.更多还原