1. General Model Information

Name: GENUCHT.LIB - FORTRAN library containing van Genuchten - Mualem hydraulic functions.

Acronym: GENUCHT_LIB


Main medium: terrestrial
Main subject: hydrology soil science
Organization level:
Type of model: static-algebraic equations
Main application: simulation/optimisation tool
Keywords: soil hydraulic properties, unsaturated hydraulic conductivity, van genuchten, mualem, closed form parametric models

Contact:

Ir. M. Heinen.
Research Institute for Agrobiology and Soil Fertility (AB-DLO), , P.O.Box 129, 9750 AC Haren (Gr.), THE NETHERLANDS.
Phone: +31.50.5337353
Fax: +31.50.5337291
email: m.heinen@ab.dlo.nl

Author(s):

Abstract:

Simple Fortran - routines for forward calculation of soil hydraulic properties described by Van Genuchten - Mualem functions. Based on known Van Genuchten - Mualem parameters the following can be computed: h(0), 0(h), C(h), K(h), K(0), dK/dh, D(0), _(h, href). Symbols: h = pressure head, 0 = volumetric water content, K = hydraulic conductivity, C = differential moisture capacity, D = diffusivity, _ = matric flux potential, href = reference pressure head.

Purpose of the model:

Model parentage: -

Source of the AbstractCAMASE Register of Agro-ecosystems Models


II. Technical Information

II.1 Executables:

Operating System(s): IBM compatible, VAX, ALPHA. Contract necessary: Costs: : Dfl. 70,=. Comments:

II.2 Source-code:

Programming Language(s): Microsoft FORTRAN-77.

II.3 Manuals:



II.4 Data:



III. Mathematical Information


III.1 Mathematics


III.2 Quantities

Rate variables: -

State variables: Pressure head, volumetric water content, differential moisture capacity, hydraulic conductivity, matric flux potential, diffusivity van Genuchten-Mualem parameters: 0s, 0r, alpha, n, Ks, labda.

III.2.1 Input

Depending on which function is used: 0, h, href, van Genuchten-Mualem parameters: 0s, 0r, alpha, n, Ks, labda. It is assumed that m- 1 - 1/n. Input check in model: Yes.

III.2.2 Output

0, h, K, C, D or _.
Basic spatial unit: cm.
Time interval of simulation: -

IV. References


Heinen, M. & P. de Willigen, 1992. FUSSIM2: a simulation model for two-dimensional flow of water in unsaturated soil. DLO-Instituut voor Bodemvruchtbaarheid Nota 260. 146 pp.



V. Further information in the World-Wide-Web


VI. Additional remarks

Parentage: -
Last review of this document by: T. Gabele: Tue Sep 24 1997
Status of the document:
last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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