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Interpretation of ponded infiltration data using numerical experiments

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    0457210 - ÚH 2017 RIV SK eng J - Journal Article
    Dohnal, M. - Vogel, T. - Dušek, J. - Votrubová, J. - Tesař, Miroslav
    Interpretation of ponded infiltration data using numerical experiments.
    Journal of Hydrology and Hydromechanics. Roč. 64, č. 3 (2016), s. 289-299. ISSN 0042-790X
    Institutional support: RVO:67985874
    Keywords : ponded infiltration experiment * two-parameter infiltration equation * three-dimensional axisymmetric dualcontinuum model * preferential flow
    Subject RIV: DA - Hydrology ; Limnology
    OBOR OECD: Environmental sciences (social aspects to be 5.7)
    Impact factor: 1.654, year: 2016

    Ponded infiltration experiment is a simple test used for in-situ determination of soil hydraulic properties, particularly saturated hydraulic conductivity and sorptivity. It is known that infiltration process in natural soils is strongly affected by presence of macropores, soil layering, initial and experimental conditions etc. As a result, infiltration record encompasses a complex of mutually compensating effects that are difficult to separate from each other. Determination of sorptivity and saturated hydraulic conductivity from such infiltration data is complicated. In the present study we use numerical simulation to examine the impact of selected experimental conditions and soil profile properties on the ponded infiltration experiment results, specifically in terms of the hydraulic conductivity and sorptivity evaluation. The effect of following factors was considered: the depth of ponding, ring insertion depth, initial soil water content, the presence of preferential pathways, hydraulic conductivity anisotropy, soil layering, surface layer retention capacity and hydraulic conductivity, the presence of soil pipes or stones under the infiltration ring. Results were compared with a large database of infiltration curves measured at the experimental site Liz (Bohemian Forest, Czech Republic). Reasonably good agreement between simulated and observed infiltration curves was achieved by combining several of factors tested. Moreover, the ring insertion effect was recognized as one of the major causes for uncertainty in the determination of soil hydraulic parameters.
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