1. General Model Information
Name: Modular Simulator of Soil and Root Processes
Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: partial differential equations (finite elements,2D), ordinary differential equations
Keywords: soil process, water flow, solute transport, gas transport, heat transport, root water uptake, modular, richards equation, convection-dispersion equation
Dennis J. Timlin
USDA-ARS Systems Research Lab
Bldg 007, Rm 008
10300 Baltimore Ave
Beltsville, MD 20705
2DSOIL is a comprehensive 2-dimensional model of soil and root processes to
track agricultural impact on water quality.
The goal of this study was to develop the framework for a generic soil
simulator that could easily be modified and incorporated into crop models.
Soil & root processes are represented by modules that interact on the
spatial-temporal grid covering the soil profile and the simulated time
interval. Data were divided into public & private components to minimize
information passing between modules. This modular structure and information
hiding simplifies replacement or addition of modules & promotes code reuse.
The classes of modules include:
Examples include the incorporation into a simple crop model & the
expansion of 2DSOIL with a management module to simulate chemical
application. The documentation includes instructions for adding
- control modules that oversee interactions between processes
- water, solute, heat, and gas transport modules
- interphase chemical transformation modules
- biochemical transformation modules
- root growth & uptake
Author of the abstract: D. Timlin
The code in most of the modules comes from existing models. These models and
their authors include GLYCIM-Basil Acock, SWMS_2D-Jerka Simunek, Tomas Vogel
and Rien van Genuchten. The nitrogen code was adapted from the model SOILN
developed by L. Bergstrom and H. Johnsson. The chemistry code comes from a
model developed by Ya. Pachepsky and T.K. Platonova. 2DSOIL has not been
validated but SOILN,
SWMS_2D which are incorporated into 2DSOIL
have been tested. 2DSOIL has been tested for consistency with SWMS_2D and
source: CIESIN Modeldatabase
II. Technical Information
Operating System(s): DOS
Programming Language(s): FORTRAN
III. Mathematical Information
Timlin, D.J., Pachepsky. Ya, Acock, B., Lemon, H. and Tent, A. 1995. 2DSOIL - A Two-Dimensional Modular Simulator of Soil and Root Processes.
In: Proceedings of the 1995 Workshop on Computer Applications in Water Management. 23 to 25 May, 1995. Colorado Water Resources Research Institute Information Series No. 79. Pg 174-178.
Timlin, D.J., Ya. Pachepsky, and B. Acock. 1996. A design for a modular,generic soil simulator to interface with plant models.
Agronomy J. 88:162-169.
Timlin, D.J. and Y. Pachepsky. 1997. A modular soil and root process simulator.
Ecological Modeling. 94,1:67-80.
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: D. Timlin, 4. 9. 1997
Status of the document:
last modified by
Tobias Gabele Wed Aug 21 21:44:38 CEST 2002