Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Aquatox for Windows : a modular fate and effects model for aquatic ecosystems.
Author Park, R. A.
CORP Author Environmental Protection Agency, Washington, DC. Office of Water.
Publisher U.S. Environmental Protection Agency, Office of Water, Office of Science and Technology,
Year Published 2000
Report Number EPA/823/R-01/008
Stock Number PB2002-104397
Subjects Aquatic ecology--Computer programs--Handbooks, manuals, etc.
Additional Subjects Ecosystem models ; Aquatic ecosystems ; Toxic chemicals ; Model components ; Applications ; Data considerations ; Calibration ; Biomass ; Documentation ; Quality assurance ; Validation ; Uncertainty analysis ; Environmental factors ; Ecological risk models ; AQUATOX ; Microsoft windows
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
NTIS  PB2002-104397 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 01/01/1988
Edition Release 1.1 .
Collation 41 pages
The AQUATOX periphyton submodel was successfully calibrated and validated with data from Walker Branch, Tennessee. A single parameter set for diatoms, green algae, and gastropods was developed to fit all twenty treatments in a factorial experiment involving low and high nutrient levels, low and high light levels, and grazing and no grazing in stream-side channels and stream enclosures. A two-year data set for periphyton on cobbles in the stream-bed was used to validate the model for continuous ambient conditions in this woodland stream. Nitrogen, phosphorous, light, and grazing were all limiting, both singly and in combination. Inclusion of a sloughing term based on senescence due to deteriorating environmental conditions and the drag force of currents on exposed periphyton biomass provided a realistic response to limiting environmental factors and was especially useful in modeling the effects of variable flow rates on diatoms and filamentous algae. The model was shown to be calibrated and validated based on the weight of evidence of reproduction of observed patterns of biomass change, concordance of maxima between predicted and observed biomass, and equivalence in predicted and observed means and variances as confirmed by relative bias and F tests.
"November 2001." EPA/823/R-01/008. Vol. 3 only. Includes bibliographical references. Microfiche.
Contents Notes
v. 3. Model validation reports Addendum.