Transient Flow from Tension Infiltrometers II. Four Methods to Determine Sorptivity and Conductivity

摘要: In Vandervaere et al. (2000) it was shown that the transient regime of axisymmetric infiltration can be described by a two-term equation with one term proportional to square root time and other time. The two corresponding coefficients, C, C 2 , are functions hydraulic conductivity, K, sorptivity, S. this paper we propose four different methods achieve determination S K. differ number disk radii supply pressure head values which utilized. We show accuracy given method is highly dependent on combination K obtained. Three situations distinguished, depending radius: (i) flow dominated lateral capillary term; (ii) gravity (iii) terms have equivalent weights. seven model soils tested here all correspond first situation usual radius values. This tends precise estimation unlikely from infiltrometer data. introduce new scale, t sab generalizes concepts well known scales grav geom . guideline for investigator choose between existing analysis use steady or flow. Finally, against numerically simulated tests Grenoble sand Yolo light clay.