連続する粗大孔隙を含む土層中の水と溶質の移動に関する実験的研究

概要

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To illustrate water and solute movement in a soil containing continuous macropore under saturated and unsaturated conditions, two-dimensional flow experiments were conducted using a thin rectangular container filled with glass beads with an artificial macropore. Under saturated conditions, the macropore functioned as a preferential flow pathway. Under unsaturated conditions, all water and solute flow only through the matrix part. When water repellency was added to the matrix, preferential flow through the macropore occurred. To investigate the size for which flow equations of a homogeneous system, i.e., Richards' equation and the convection-dispersion equation, are valid for describing the macroscopic transport of water and solute in soils with macropores, computer simulations using the finite element method were conducted. When the size of the domain under consideration exceeded the size of the macropores sufficiently, flow equations of the homogeneous system were useful for describing the average behavior of water and solute.
日本地形学連合の論文
2002-10-25