1. General Model Information

Name: Soil Water In Forested ecosystems model

Acronym: SWIF

Main medium: terrestrial
Main subject: hydrology,forestry
Organization level:
Type of model: not specified
Main application:
Keywords: forest, soil water dynamics


Dr. ir. Willem Bouten
Soil Physics and Forest Hydrology
University of Amsterdam

Phone: 31 20 525 7412
Fax: 31 20 525 7431
email: W.Bouten@frw.uva.nl



SWIF (Soil Water In Forested) ecosystems model is part of a larger model, called ForHyd (Forest-Hydrological) model (Bouten and Witter, 1992).

At present, ForHyd includes three other modules:

The purpose of SWIF is to quantify soil water dynamics in support of ecosystem research.

SWIF is a deterministic, numerical, one-dimensional, layered column model based on the Richards equation for simulating vertical water flow and root water uptake in the unsaturated zone and lateral drainage in the saturated zone of the soil profile.

SWIF contains several components. These are transpiration, soil evaporation, forest floor hydrology, water uptake by roots, Richards equation, soil water fluxes calculated by applying Darcy's equation, horizontal drainage, potential evaporation according to Makkink, potential transpiration potential soil evaporation, water stress due to drought, water stress due to waterlogging.

The model requires as data input:

The temporal scale of the model is days to years. It is widely used in the Forest Service.

Author of the abstract:


II. Technical Information

II.1 Executables:

Operating System(s): Program version for PC; RAM 640 K required; disk use 2 MB; runtime for 386 / 387 is 1 to 5 minutes per year depending on the hydrological situation

II.2 Source-code:

Programming Language(s): FORTRAN 77

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

Bouten, W., and J.V. Witter. 1992. Modeling soil water dynamics in a forested ecosystem II: evaluationof spatial variation of soil profiles. Hydro. Proc. 6:435-444.

V. Further information in the World-Wide-Web

CIESIN Database

VI. Additional remarks

Global change implications: This model is valuable for globalchange research in that it examines forest-hydrologic interactions at thewatershed scale. It is widely used in the Forest Service.



A Model Data Needs Assessment Report CIESIN

Last review of this document by: 21.06.96
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:51 CEST 2002

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