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中文摘要：
精确描述水流在土壤中的运动需要能够反映土壤物理特性的模型。将土壤介质在空间上分为基质区与大孔隙区2种介质区，把大孔隙看作竖直向下的管道，并利用土壤大孔隙密度概念，把杂乱无章的大孔隙分布进行了简化，同时采用不同的方法分别对2种不同介质内的水流进行了模拟，在算例计算时又采用了区域分解算法，提高了计算效率。通过模拟结果的对比可以看出，采用的模型及方法较好地描述出了大孔隙流的特点。
英文摘要：
Exact description of water movement in soil needs a model that can reflect the physics character of soil. In this paper, we regard that soil is divided into two porous media, one for matrix flow, one for macropore flow, and a macropore is assumed extend vertically from soil surface down to desired depth, macropore density is also imported into model to describe the complex distribution of macropore in soil. Water movement in two flow domain is simulated using different models, in order to improve the computational efficiency, domain decomposition method is adopted. From the comparison of the simulating results, it can be found that the models and methods that used in the paper can preferably depict the characteristic of macropore flow and improve the practicability and applicability of the model.
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