Lignitic mine soils represent a dual-porosity\nmedium consisting of a technogenic mixture of overburden\nsediments that include porous fragments embedded within\na mostly coarse-textured matrix. Flow and transport process\nin such soils are not sufficiently understood. The\nobjective of this study was to identify the most appropriate\nconceptual model for describing small-scale heterogeneity\neffects on flow based on the physical structure of the system.\nHYDRUS-1D was used to simulate water flow under\nfield conditions. We compared a dual-porosity (mobileââ?¬â??\nimmobile) model simulation of the field soil water with\nfield monitoring results. The predicted and observed water\ncontent were in good agreement. Since the heterogeneity of\nthe lignitic mine soil may lead to preferential flow, Coomassie\nbrilliant blue dyes were applied to the reclaimed\nsurface, revealing preferred flow paths through macropores\nsurrounding the numerous, large rock fragments
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