Record Display for the EPA National Library Catalog


Main Title Mathematical Model of the Columbia River from the Pacific Ocean to Bonneville Dam. Part I. Theory, Program Notes and Programs.
Author Callawa, R. J. ; Byra, K. V. ; Ditswort, G. R. ;
CORP Author Pacific Northwest Water Lab., Corvallis, Oreg.
Year Published 1969
Report Number 11867,; 16070-DBH-11/69
Stock Number PB-202 422
Additional Subjects ( Rivers ; Mathematical models) ; Estuaries ; Tidewater ; Water pollution ; Temperature distribution ; Periodic variations ; Meteorological data ; Tidal currents ; Computerized simulation ; Water flow ; Flow measurement ; Computer systems programs ; Washington(State) ; Oregon ; Tidal rivers ; Water pollution models ; Columbia river ; Thermal pollution ; Finite element analysis
Library Call Number Additional Info Location Last
NTIS  PB-202 422 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 157p
The Columbia River from the Pacific Ocean to Bonneville Dam is treated as a series of two-dimensional finite elements in the formulation of a mathematical model of the system. Currents and stages are simulated along the river via an explicit solution of the one-dimensional equations of motion and continuity; two-dimensional conditions in the horizontal are approached by means of a branched network of connecting channels and junctions. Computed net velocities and stages are used as input to the advection-diffusion equation and solutions are obtained for any coupled (e.g., BOD-DO) or uncoupled, first order reaction, conservative and/or non-conservative substance. Emphasis is placed on obtaining a solution for temperature as the dependent variable. Allowance is made for input of meteorological variables and a stepwise heat budget computation is made in order to predict temperature conditions on an hourly basis. A discussion of some existing pollution models, numerical methods and error sources is given; computer programs and program notes are listed. (Author)