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Estimate of soil hydraulic properties from disc infiltrometer threedimensional infiltration curve: theoretical analysis and field applicability

AuthorsLatorre Garcés, Borja ; Moret-Fernández, David ; Peña-Sancho, Carolina
Keywordssoil hydraulic properties
hydraulic conductivity
cumulative infiltration measurement
transient water flow
tension disc infiltrometer
Issue Date2013
CitationLatorre B, Moret-Fernández D, Peña C. Estimate of soil hydraulic properties from disc infiltrometer threedimensional infiltration curve: theoretical analysis and field applicability. In: Four decades of progress in monitoring and modeling of processes in the soil-plant-atmosphere system: applications and challenges (Romano N, Durso G, Severino G, Chirico GB, Palladino M, eds.). Procedia Environmental Sciences 19: 580–589 (2013)
AbstractThis paper describes a new method (NSQE) to estimate soil hydraulic properties (sorptivity, S, and hydraulic conductivity, K) from full-time cumulative infiltration curves. The technique relies on an inverse procedure involving the quasi-exact equation of Haverkamp et al. (1994). The numerical resolution is described and the sensitivity of the method is theoretically evaluated, showing that the accuracy of the estimates depends on the measured infiltration time. A new procedure to detect and remove the effect of the contact sand layer on the cumulative infiltration curve is also given. The method was subsequently compared to the differentiated linearization procedure (DL), which calculate K and S from the simplified Haverkamp et al. (1994) equation, valid only for short to medium times. A total of 264 infiltration measurements performed with a 10cm diameter disc under different soil conditions were used. Compared to the DL procedure, field measurements showed that the NSQE method allowed better estimates of soil hydraulic properties, independently on the infiltration noise and the presence of contact sand layer. Overall, although comparable S values were estimated with both methods, the longer infiltration times allowed by the proposed method made this procedure more accurate estimations of K. In conclusion, the NSQE method have shown to be a significant advance to accurate estimate of the soil hydraulic properties form the transient water flow.
Description9 Pags., 3 Figs., 2 Tabls. The definitive version is available at: http://www.sciencedirect.com/science/journal/18780296/19/supp/C
Publisher version (URL)http://dx.doi.org/10.1016/j.proenv.2013.06.066
Appears in Collections:(EEAD) Libros y partes de libros
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