1. General Model Information

Name: SHIELD 1.0 - Simulation of Hedgerows Intervention against Erosion and Land Degradation.

Acronym: SHIELD

Main medium: terrestrial
Main subject: agriculture, hydrology, soil science
Organization level: ecosystem
Type of model: compartment model
Main application:
Keywords: hedgerows, runoff, soil loss, maize yield, water-balance


Dr. P. Kiepe.
Grevingaheerd 166, 9737 ST Groningen, THE NETHERLANDS.
Phone: +31.50.5414714
Fax: +31.50.5414714



SHIELD calculates the effect of hedgerows on runoff, soil loss and maize yield. Crop growth simulation is based on and MAIZE*, but the water balance has been changed extensively. The amount of excess water runs off. Infiltration depends on management and is calculated with a set of algorithms that will be published shortly. Loss of soil is calculated through the calculation of the sediment concentration in runoff. Climatic data are read from the CABO/TPE Weather System* files, with inclusion of rainfall intensity data.

Purpose of the model:

Model parentage: SUCROS, MAIZE and MASQUE.

Source of the AbstractCAMASE Register of Agro-ecosystems Models

II. Technical Information

II.1 Executables:

Operating System(s): IBM compatible PC/AT >= 640 Kb RAM.
Contract necessary:
Costs: : Not yet available.

II.2 Source-code:

Programming Language(s): FST*.

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

Rate variables: Crop specific variables (development, photosynthesis, maintenance, growth, evaporation, transpiration) and soil specific variables (infiltration, hydraulic conductivity, etc.).

State variables: Crop variables (grain weight, cob weight, biomass) and soil variables (water content, amount of water in the soil, drainage, runoff).

III.2.1 Input

Slope, latitude, climatic data, crop species specific data (physiological and morphological) and soil data (infiltration, texture, soil organic matter content). Input check in model: No.

III.2.2 Output

Maize yield, total runoff, total soil loss and any other rate or state variable desired.
Basic spatial unit: m2 - ha.
Time interval of simulation: 1 day.

IV. References

Kiepe, P., 1995. No runoff, no soil loss: soil and water conservation in hedgerow barrier systems. Tropical Resource Management Papers 10, Wageningen. 156 pp.

V. Further information in the World-Wide-Web

  • VI. Additional remarks

    Parentage: SUCROS, MAIZE and MASQUE
    Last review of this document by: T. Gabele: Dec 10 1997
    Status of the document:
    last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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