1. General Model Information

Name: METRONIA Ver. 3.04

Acronym: METRONIA


Main medium: terrestrial
Main subject: hydrology
Organization level: ecosystem
Type of model: not specified
Main application:
Keywords: Wind's evaporation method, data processing tool, unsaturated, soil, hydraulic properties, hydraulic functions, hydraulic conductivity, retention, characteristic,parameter estimation, laboratory determination, unimodal,bimodal, parametric models

Contact:

Junt Halbertsma
DLO Winand Staring Centre (SC-DLO)
P.O. Box 125
NL-6700 AC Wageningen
The Netherlands
Email: to j.m.halbertsma@sc.dlo.nl

Author(s):

Junt Halbertsma

Abstract:

The program-package performs all necessary procedures to derive the soil hydraulic functions from a Wind's evaporation experiment on laboratory soil cores. Necessary experimental data are matric potential versus time(0.5 to 8h increment) and depth (2 to 4 cm increment) and total sample weight versus time. The water retention (desorption)-characteristic is calculated using an iterative method proposed by Wind (1968) which has been combined with the parameter-fitting procedure of SHYP (DURNER 1994). Soil hydraulic conductivity is calculated explicitly using an instantaneous profile method according to WEEKS and RICHARDS. The retention characteristic is expressed in terms of bimodal or unimodal (unrestricted) van Genuchten parametric models, the conductivity versus matric potential and water content is given in array form and in functional representation. The calculated conductivity curve is not dependent on theoretical relationships between retention and conductivity characteristics. The range of the method is restricted to conductivities smaller than 1 to 10 cm/day (limited by the accuracy of the tensiometers) and to matric potentials greater than -800 hPa. The program comes with a user manual giving detailed information about the computer program along with instructions for data input preparation and listings of sample input and output files.


II. Technical Information

II.1 Executables:

Operating System(s): DOS The program and manual are available upon request from: Junt Halbertsma DLO Winand Staring Centre (SC-DLO) P.O. Box 125 NL-6700 AC Wageningen The Netherlands Email: to j.m.halbertsma@sc.dlo.nl

II.2 Source-code:

Programming Language(s): FORTRAN

II.3 Manuals:

(see Executables)

II.4 Data:

(see Executables)

III. Mathematical Information


III.1 Mathematics


III.2 Quantities


III.2.1 Input

III.2.2 Output


IV. References

BOELS, D., van GILS, J.B.H.M., VEERMAN, G.J., & WIT, K.E., 1978. Theory and system of automatic determination of soil moisture characteristics and unsaturated hydraulic conductivities. Soil Sci 126: 191-199.
DURNER, W., 1994. Hydraulic conductivity estimation for soils with heterogeneous pore structure. Water Resour Res 30: 211-223
FEDDES, R.A., KABAT, P., van BAKEL, P.J.T., BRONSWIJK, J.J.B, & HALBERTSMA, J., 1988. Modelling soil water dynamics in the unsaturated zone - State of the art. J Hydrol 100: 69-111
HALBERTSMA, J.M., & VEERMAN, G.J., 1994. A new calculation procedure and a simple set-up for the evaporation method to determine soil hydraulic functions. Report 88, SC-DLO, Wageningen, The Netherlands
ISO 11275 1996 Soil quality - Determination of the unsaturated hydraulic conductivity and water retention characteristic - Wind's evaporation method.
KRAHMER, U. 1987. EDV-gestuetztes Mess- und Auswerteverfahren zur Bestimmung der ungesaettigen Wasserleitfaehigkeit nach der Verdunstungsmethode. Zeitschrift fuer Pflanzenernaehrung und Bodenkunde 150: 392-394.
MALICKI, M.A., PLAGGE, R., RENGER, M. & WALCZAK, R.T. 1992. Application of time-domain reflectometry (TDR) soil moisture miniprobe for the determination of unsaturated soil water characteristics from undisturbed soil cores. Irrigation Science 13: 65-72.
STOLTE, J., FREYER, J.I., BOUTEN, W., DIRKSEN, C., HALBERTSMA, J.M., Van DAM, J.C., Van den BERG, J.A., VEERMAN, G.J. & WVSTEN, J.H.M. 1994. Comparison of six methods to determine unsaturated soil hydraulic conductivity. Soil Sci Soc Am J 58: 1596-1603.
TAMARI, S., BRUCKLER, L., HALBERTSMA, J., & CHADOEUF, J. 1993. A simple method for determining soil hydraulic properties in the laboratory. Soil Sci Soc Am J 57: 642-651
WENDROTH, O., EHLERS, W., HOPMANS, J.W., KAGE, H., HALBERTSMA, J. & WVSTEN, J.H.M. 1993. Re-evaluation of the evaporation method for determination of hydraulic functions in unsaturated soil. Soil Sci So Am J 57: 1436-1443.
WIND, G.P. 1968. Capillary conductivity data estimated by a simple method. In: P.E. Rijtema and H. Wassink (editors), Water in the unsaturated zone, Proceedings of the Wageningen symposium, June 1966, IASH Gentbrugge/ Unesco Paris, Vol. 1, pp. 181-191

V. Further information in the World-Wide-Web



VI. Additional remarks


Last review of this document by: T. Gabele: 07.07. 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:45 CEST 2002

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