Influence of the β parameter of the Haverkamp model on the transient soil water infiltration curve

JOURNAL OF HYDROLOGY

卷:564

Article

Latorre, B.¹  Moret-Fernandez, D.¹  Lassabatere, L.²  Rahmati, M.³  Lopez, M., V¹  Angulo-Jaramillo, R.²  Sorando, R.⁴  Comin, F.⁴  Jimenez, J. J.⁵ 

[1] CSIC, Estn Expt Aula Dei, Dept Suelo & Agua, POB 13034, Zaragoza 50080, Spain

[2] Univ Lyon 1, Univ Lyon, Lab Ecol Hydrosyst Nat & Anthropises UMR5023, ENTPE,CNRS, 3 Rue Maurice Audin, F-69518 Vaulx En Velin, France

[3] Univ Maragheh, Fac Agr, Dept Soil Sci, Maragheh, Iran

[4] CSIC, Inst Pirena Ecol, Av Montanana 1005, Zaragoza 50059, Spain

[5] Pyrenean Inst Ecol IPE CSIC, ARAID, Avda Ntra Sra Victoria 16, Jaca 22700, Huesca, Spain

关键词: Sorptivity;    Hydraulic conductivity;    Water retention curve;    Methods;   

DOI  :  10.1016/j.jhydrol.2018.07.006

来源: Elsevier

【 摘 要 】

Soil water infiltration can be described with the quasi-analytical Haverkamp et al. (1994) equation, defined by the hydraulic conductivity (K-s), sorptivity (S) and the beta parameter. K-s and S are commonly estimated from the transient cumulative infiltration curve, using a constant beta value. The objective of this work was to study the influence of beta on the estimation of K-s and S. The study was first performed on synthetic 1-D infiltration curves generated at different infiltration times for loam sandy, loamy and silty soils, and next extrapolated to a 3-D loam synthetic soil and on 10 infiltrations curves measured on the field with a disc infiltrometer on different types of soils. The infiltration measurements lasted between 600 and 900 s. The results showed that, while early infiltration times (i.e. 100 s) promoted good estimations for S, longer infiltrations (i.e. 1.000 s) were required to estimate accurately K-s. Only very long infiltration (i.e. 10.000 s) allowed defining the actual beta value. A similar behaviour was observed for the 3-D infiltration measurements. Except for f, significant relationships (R-2 = 0.99) were obtained between the K-s and S of the three theoretical soils and the corresponding values calculated by optimizing the three hydraulic parameters on 2.000 s 1-D infiltration curves. The large confidence interval observed in beta (between 0.3 and 2.0) resulted from the fact that beta had a small effect on the infiltration curve. A significant relationship (R-2 = 0.99) was also obtained between the K-s and S optimized from the experimental curves using a beta = 1.1 and the corresponding values obtained by simultaneous optimization of the three hydraulic parameters. These results demonstrated that S and K-s can be accurately estimated using a constant beta and that downward infiltration is not an appropriate procedure to estimate beta.

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