| 王康,张仁铎,王富庆.基于不完全分形理论的土壤水分特征曲线模型[J].水利学报,2004,35(5):0001-0006 |
| 基于不完全分形理论的土壤水分特征曲线模型 |
| Model for estimating soil water retention based on incomplete fractal theory |
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| DOI： |
| 中文关键词: 不完全分形 孔隙及粒径分布 土壤水分特征曲线 |
| 英文关键词: incomplete fractal theory particle-pore size distribution soil water retention characteristic parameters |
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| 中文摘要: |
| 本文将土壤的物理构成分为不具有分形结构的固体颗粒和孔隙以及具有分形结构的团聚体结构，建立了土壤孔隙和粒径分布的不完全分形模型，并与土壤毛管水运动Young-Laplace方程相结合推导出土壤水分特征曲线模型。将模型应用于6种土壤的结果表明，模型所包括的3个参数中分形维数有随土壤黏粒含量的增加而增大的趋势，另2个参数分别为基质势作用下的可释放含水率和特征曲线的形状参数。所提出的水分特征曲线模型能够较好的模拟不同土壤质地和基质势范围下土壤基质势和含水率的特征关系。 |
| 英文摘要: |
| The soil is regarded as a structure composed of non-fractal soil particles and pores as well as fractal aggregation. Based on the fractal theory and Young-Laplace equation, used for describing the capillary flow in soils, a new fractal soil water retention model is established. Soil water retention data obtained from six kinds of soil are used to evaluate the applicability of the proposed model. The application shows that one of the parameters in the model named as fractal dimension increases with the increase of clay content, and another two parameters can be considered as releasable water content and shape parameter respectively. The comparison of predicted soil water retention with measured data shows that the proposed model can be used to describe various soil textures. |
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