Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Generalized Soft Water Acidification Model.
Author Nikolaidis, N. P. ; Rajaram, H. ; Schnoor, J. L. ; Georgakakos, K. P. ;
CORP Author Iowa Univ., Iowa City.;Corvallis Environmental Research Lab., OR.
Publisher c1988
Year Published 1988
Report Number EPA/600/J-88/565;
Stock Number PB91-182055
Additional Subjects Acidification ; Mathematical models ; Hydrology ; Surface waters ; Ecosystems ; Water pollution effects ; Time series analysis ; Deposition ; pH ; Air water interactions ; Snowmelt ; Lake Woods ; Lake Panther ; Watersheds ; Water chemistry ; Physicochemical properties ; Water flow ; Evapotranspiration ; New York ; Case studies ; Biochemistry ; Reprints ; Enhanced Trickle-Down Model ; Soft water ; Adirondack Park
Library Call Number Additional Info Location Last
NTIS  PB91-182055 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 09/04/1991
Collation 16p
A generalized soft water acidification model has been developed. The enhanced trickle-down (ETD) model is driven by precipitation, evaporation, acidity, sulfate, and chloride loading time series daily input data. The hydrologic component simulates snowmelt, interflow, overland flow, groundwater flow, frozen ground processes, seepage, and evapotranspiration. Physicochemical and biological processes that affect the alkalinity or sulfate balance and are included in the formulation are cation exchange, chemical weathering, sulfate sorption, and sulfate reduction. The system of 20 ordinary differential equations is solved by using a variable time step fourth-order predictor-corrector numerical scheme. Shown here is calibration of the ETD model for two lakes in the Adirondack Park of New York. ETD is relatively simple and requires limited input data, and yet it accounts for the predominant hydrologic and biochemical processes of the ecosystem. (Copyright (c) 1988 by the American Geophysical Union.)