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

This Article Abstract 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 Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Prunty, L. Articles by Casey, F. X. M. Search for Related Content PubMed Articles by Prunty, L. Articles by Casey, F. X. M. GeoRef GeoRef Citation Agricola Articles by Prunty, L. Articles by Casey, F. X. M. Related Collections Hydraulic Conductivity Soil Hydrology Soil Models Soil Analysis Soil Physics Vadose Zone Processes and Chemical Transport

Soil Water Retention Curve Description Using a Flexible Smooth Function

Department of Soil Science, North Dakota State Univ., Fargo, ND 58105-5638

View larger version (11K): [in a new window]   Fig. 1. Notation for points and asymptote lines which are used to define flexible functions.

View larger version (11K): [in a new window]   Fig. 2. Plot of an example of a function given by Eq. [4]. Values of d are 0.01 except for d3, which is 0.1.

View larger version (15K): [in a new window]   Fig. 3. The Brooks and Corey (BC) function of Eq. [7] represented by the curved line and its dashed extension. Since relative saturation is limited to 1, the WRC is represented everywhere by the solid line. The dashed straight lines represent the limiting case of d = 0.

View larger version (15K): [in a new window]   Fig. 4. The van Genuchten function of Eq. [9]. This function has exactly zero slope at x = 0 and at x = . The dashed straight lines represent the limiting case of d = 0.

View larger version (28K): [in a new window]   Fig. 5. Examples of the fit of different functions to measured WRC data. (a) Results of fitting three functions from the literature. (b) Results of fitting the flexible function.

View larger version (19K): [in a new window]   Fig. 6. Example of flexible function fit to data from Dane and Puckett (1992).

View larger version (25K): [in a new window]   Fig. 7. Fit of the flexible function and the virtual cubic spline functions to scatter data.

View larger version (21K): [in a new window]   Fig. 8. Comparison of RETC (van Genuchten, 1980) and the flexible function. (a) Water content. (b) Relative hydraulic conductivity.