HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (8) Citing Articles via Google Scholar Google Scholar Articles by Si, B.C. Articles by Kachanoski, R.G. Search for Related Content PubMed Articles by Si, B.C. Articles by Kachanoski, R.G. GeoRef GeoRef Citation Agricola Articles by Si, B.C. Articles by Kachanoski, R.G.

DIVISION S-1-SOIL PHYSICS

Unified Solution for Infiltration and Drainage with Hysteresis

Theory and Field Test

^a Soil Science Dep., Univ. of Saskatchewan, Saskatoon, SK, Canada S7N 5A8

gary.kachanoski{at}usask.ca

Hysteresis has been found in both the hydraulic conductivity, K, vs. pressure head, , relationship, and the soil water content, , vs. relationship. This limits the application of a unified solution for infiltration and drainage. A Haines' Jump model of hysteresis is proposed and combined with the Broadbridge and White form of K() and the diffusivity, D, relationship, D(). This allows a unified analytical solution for infiltration and drainage. This solution accounts for hysteresis by allowing the inverse macroscopic capillary length scale, , to be hysteretic. A method of a priori estimating the hysteretic nature of is proposed and tested. The hysteretic change in can be estimated from other () hysteresis models and then used in combination with the Broadbridge and White hydraulic functions. The predicted hysteresis in was similar to that obtained from inverse procedures. The unified solution was applied to field-measured soil water storage during infiltration and drainage. Neglecting hysteresis resulted in poor prediction of water storage during drainage based on hydraulic parameters estimated from infiltration. This was especially true for drainage with high initial water content. Incorporating the proposed hysteresis model resulted in prediction error less than measurement error. In addition, a single unified inverse procedure for estimating hydraulic parameters from combined infiltration and drainage measurements can now be developed.

Abbreviations: RMS, root mean square error • TDR, time domain reflectometry

This article has been cited by other articles:

				B. A. Ebel, K. Loague, J. E. Vanderkwaak, W. E. Dietrich, D. R. Montgomery, R. Torres, and S. P. Anderson Near-surface hydrologic response for a steep, unchanneled catchment near Coos Bay, Oregon: 2. Physics-based simulations Am J Sci, April 1, 2007; 307(4): 709 - 748. [Abstract] [Full Text] [PDF]

				B. C. Si and R. G. Kachanoski Measurement of Local Soil Water Flux during Field Solute Transport Experiments Soil Sci. Soc. Am. J., May 1, 2003; 67(3): 730 - 736. [Abstract] [Full Text] [PDF]

				H. H. Gerke and J. M. Kohne Estimating Hydraulic Properties of Soil Aggregate Skins from Sorptivity and Water Retention Soil Sci. Soc. Am. J., January 1, 2002; 66(1): 26 - 36. [Abstract] [Full Text] [PDF]