1. General Model Information

Name: Trace Element TRANSport

Acronym: TETRANS

Main medium: terrestrial
Main subject: hydrology, biogeochemistry, local mass balance
Organization level: ecosystem
Type of model: 1D, compartment model
Main application:
Keywords: soil, water movement, water balance, solute transport, leaching, field scale, capacity cascade soil water model, adsorption


Dennis Corwin
U.S. Salinity Laboratory
450 West Big Springs Road
Riverside, CA 92507-4716

Phone: 909-369-4819
FAX: 909-342-4818
email: dcorwin@ussl.ars.usda.gov


D.L. Corwin.


TETrans is a functional, layer-equilibrium model of one-dimensional solute transport through the vadose zone under transient-state conditions. This type of model is often referred to as a "tipping-bucket model".

TETrans is a capacity model that defines changes in amounts of solute and water content rather than rates of change. As such, it is driven by the amounts of rainfall, irrigation, or evapotranspiration and only considers time indirectly by using the time from one irrigation or precipitation event to another.

TETrans predicts the average concentration of a solute within each defined soil layer or depth increment. Transport through the soil profile is modeled as a series of events or processes for a finite collection of discrete depth intervals. These sequential events or processes include: (i) infiltration and drainage to field capacity, (ii) instantaneous chemical equilibration for reactive solutes, (iii) water uptake by the plant root resulting from transpiration and evaporative losses from the soil surface, and (iv) instantaneous chemical reequilibration. Each process is assumed to occur in sequence within a given depth interval as opposed to reality where transport is a collection of simultaneous processes.

TETrans accounts for the hydraulic and physicochemical processes of water flow including preferential flow, evapotranspiration with a root growth and water uptake distribution function, adsorption-desorption, and drainage. The model determines the vertical profile distributions of total, soluble and adsorbed concentrations of a solute within and beyond the root zone; soil water content profile distribution; total drainage; total solute loading beyond the root zone; plant water uptake distribution; and leaching efficiency.

II. Technical Information

II.1 Executables:

Operating System(s): The program and manual are available upon request from: Dennis Corwin U.S. Salinity Laboratory,USDA, ARS please email: dcorwin@ussl.ars.usda.gov

II.2 Source-code:

Programming Language(s):

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

D. L. Corwin. 1995.
Trace Element Transport - Transient-State Solute Transport Model for the Vadose Zone
PC version 1.5 , Macintosh version 1.6
U.S. Salinity Laboratory, USDA, ARS, Riverside, California.

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: T. Gabele: 08. 07. 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:51 CEST 2002

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