Record Display for the EPA National Library CatalogRECORD NUMBER: 6 OF 23
|Main Title||Development of a Simulation Model for Estimating Ground Level Concentrations of Photochemical Pollutants. Appendix D. Numerical Integration of the Continuity Equations.|
|Author||Reynold, Steven D. ;|
|CORP Author||Systems Applications, Inc., Beverly Hills, Calif.|
|Report Number||71SAI-21; CPA-70-148; 0911;|
|Stock Number||PB-206 412|
|Additional Subjects||( Air pollution ; Atmospheric models) ; ( Smog ; Atmospheric models) ; ( Atmospheric motion ; Air pollution) ; Atmospheric composition ; Urban areas ; Mathematical models ; Carbon monoxide ; Applications of mathematics ; California ; Numerical integration ; Finite difference theory ; Los Angeles(California)|
The simulation model for estimating ground level concentrations of photochemical pollutants is based on the equations of continuity for a turbulent fluid in which chemical reactions occur. A variant of the method of fractional steps is based on the repeated but separate solution of three two-dimensional problems--in (x,t), (y,t), and (z, t) space--at each time step. Experience indicates that the procedure (with second or fourth-order approximation included) is stable and poses no particular computational difficulties. The basis for the selection of the numerical technique adopted is discussed. A detailed exposition of the method is given. The discussion is concluded with an evaluation of the procedure and a summary of experience with its use.