GSTDTAP  > 资源环境科学
DOI10.1029/2020WR027808
A new fractal approach to account for capillary and adsorption phenomena in the water retention and transfer properties of unsaturated soils
Filip Stanić; Pierre Delage; Ioulia Tchiguirinskaia; Pierre‐; Antoine Versini; Yu‐; Jun Cui; Daniel Schertzer
2020-11-16
发表期刊Water Resources Research
出版年2020
英文摘要

To describe the water retention and transfer properties of an unsaturated soil over the whole range of matric suction, it is necessary to account for both capillary and adsorption phenomena. Existing models combine well‐known empirical functions for capillary water at lower suctions and more physically‐based ones for adsorptive water at higher suctions. To determine their full set of parameters, they however require different optimization procedures, among which those coming from capillary models are empirical. In this context, the main objective of this work is to develop a simple and robust physically‐based model of the water retention and transfer properties of unsaturated soils valid from saturation to oven‐dryness. To do so, new capillary‐based water retention and hydraulic conductivity functions founded on the fractal approach have been derived from the pore size distribution, by means of the Young‐Laplace law and Mualem's model. To describe adsorption phenomena, these functions are combined with those used in the Peter‐Iden‐Durner (PID) model, providing a model along the full‐range of suctions, with less parameters than the existing models. Our work also shows that some parameters are directly determined from the experimental grain size distribution data (the fractal dimension), or from the water retention data (air entry suction and residual water content), leaving only two parameters to be optimized. The model was successfully validated with respect to published experimental data from 10 different coarse, sandy and clayey soils.

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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/304319
专题资源环境科学
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Filip Stanić,Pierre Delage,Ioulia Tchiguirinskaia,et al. A new fractal approach to account for capillary and adsorption phenomena in the water retention and transfer properties of unsaturated soils[J]. Water Resources Research,2020.
APA Filip Stanić.,Pierre Delage.,Ioulia Tchiguirinskaia.,Pierre‐.,Antoine Versini.,...&Daniel Schertzer.(2020).A new fractal approach to account for capillary and adsorption phenomena in the water retention and transfer properties of unsaturated soils.Water Resources Research.
MLA Filip Stanić,et al."A new fractal approach to account for capillary and adsorption phenomena in the water retention and transfer properties of unsaturated soils".Water Resources Research (2020).
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