Quantitative morphology and network representation of soil pore structure
Quantitative morphology and network representation of soil pore structure
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DOI：
10.1016/s0309-1708(00)00055-5
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发表时间：
2001-02
影响因子：
4.7
通讯作者：
H. Vogel;K. Roth
中科院分区：
文献类型：
--
作者：
H. Vogel;K. Roth
孔隙网络模型在描述土壤中的孔隙几何和运移过程方面很有吸引力。在这一贡献中，提出了一种基于三维孔隙几何的定量形态研究来生成网络模型以预测土壤水力特性的“形态路径”。通过浸渍样品的连续切片获得了直径大于0.04 mm的孔的三维几何形状。除了孔径分布之外，孔隙几何的一个重要的拓扑学方面是孔隙空间的连通性，这是很难测量的。提出了由3D-Euler数定义的连通性函数。在不同大小和形状的子样本中，考察了序列截面法估计欧拉数的优良性。然后，生成一个简单的网络模型，该模型可以适应预定义的孔径分布和连通性函数。在相同的土壤材料上，将水力特性的网络模拟与独立的测量进行了比较，并研究了地形对水流和溶质运移的影响。得出的结论是，由连通性函数定义的对孔隙尺寸分布和拓扑的粗略估计可能足以预测水力特性。
Pore-network models are attractive to relate pore geometry and transport processes in soil. In this contribution a `morphological path' is presented to generate a network model based on quantitative morphological investigations of the 3D pore geometry in order to predict soil hydraulic properties. The 3D-geometry of pores larger than 0.04 mm in diameter is obtained using serial sections through impregnated samples. Beside pore-size distribution an important topological aspect of pore geometry is the spatial connectivity of the pore space which is difficult to measure. A connectivity function is proposed defined by the 3D-Euler number. The goodness in the estimation of the Euler number using serial sections is investigated in subsamples of different sizes and shapes. Then, a simple network model is generated which can be adapted to a predefined pore-size distribution and connectivity function. Network simulations of hydraulic properties are compared to independent measurements at the same soil material and the effect of topology on water flow and solute transport is investigated. It is concluded that a rough estimation of pore-size distribution and topology defined by the connectivity function might be sufficient to predict hydraulic properties.