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Transient Flow from Tension Infiltrometers

I. The Two-Parameter Equation

^a Lab. d'étude des Transferts en Hydrologie et Environ. (CNRS UMR 5564, INPG, IRD, UJF) BP 53, 38041 Grenoble Cedex 9, France
^b Dep. of Land Resource Sci., Univ. of Guelph, Ontario, Canada N1G 2W1

View larger version (45K): [in a new window]   Fig. 1 Determination of coefficients C1 and C2 for a disk infiltrometer test: (a) cumulative infiltration and infiltration flux, (b) differentiated linearization method, (c) cumulative linearization method, (d) cumulative influx method, and (e) infiltration flux method

View larger version (23K): [in a new window]   Fig. 2 Simulated effect of the sand contact layer on infiltration. (a) cumulative infiltration, (b) infiltration flux, (c) cumulative linearization method, and (d) differentiated linearization method

View larger version (26K): [in a new window]   Fig. 3 Application of the differentiated linearization method for numerically simulated infiltration tests and for two disk radii: (top) Grenoble sand (GS), and (bottom) Yolo light clay (YLC)

View larger version (41K): [in a new window]   Fig. 4 Quarter-disk infiltrometer and the cubic plexiglas box

View larger version (18K): [in a new window]   Fig. 5 Application of the differentiated linearization method to laboratory infiltration tests: axisymmetric geometry (3D), and one-dimensional geometry (1D)

View larger version (11K): [in a new window]   Fig. 6 Comparison of C1 estimates as a function of pressure head: axisymmetric geometry (3D), and one-dimensional geometry (1D)