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Determining the influence of stones on hydraulic conductivity of saturated soils using numerical method
- NovÃ¡k, Viliam, KÅava, Karol, Å imÅ¯nek, Jirka
- Geoderma 2011 v.161 no.3-4 pp. 177-181
- moraine soils, saturated hydraulic conductivity, simulation models, soil water movement, stony soils, water flow
- Mountainous soils usually contain a large number of rock fragments (particle diameter>2mm), which influence soil hydraulic and retention properties. Data characterizing the properties of these soils usually describe only the fine earth (particle diameter<2mm). To quantitatively describe soil water movement in stony soils, their most important characteristic, i.e., the effective saturated hydraulic conductivity (Kââ), must be known. The objective of this study was to use a numerical method for estimating the saturated soil hydraulic conductivity that depends on relative stone content (stoniness), and sizes and shapes of stony parts. The method is based on a numerical version of the classical experiment of Darcy. The steady-state water flow under a unit hydraulic gradient through hypothetical soils containing stones was simulated using the two-dimensional simulation model HYDRUS-2D. Four soil textural types were considered. Special attention was paid to the moraine soil from the FIRE site in High Tatras. A relationship between the relative saturated hydraulic conductivity, Káµ£, and the relative stone content, Ráµ¥, was derived. Káµ£(Ráµ¥) function is decreasing slower for larger stones. Numerical results were used to propose an empirical equation to estimate Káµ£ of soils containing rock fragments of a spherical shape of various diameters.