The Maryland Power Plant Siting Program (PPSP) Air Quality Model User's Guide

摘要

This User's Guide describes the application of the Maryland Power Plant Siting Program (PPSP) air quality model. The required documentation is presented in five sections: (1) introduction to model development, PPSP model applications, and model descriptions, including comparisons with the U.S. Environmental Protection Agency (EPA) CRSTER model; (2) technical discussion of PPSP model components that deviate from the EPA model; (3) description of preprocessor modifications, with inputs and outputs specific to the PPSP model; (4) required alterations to the UNAMAP4 version of the CRSTER model, source code listings of the PPSP model, and the modified meteorological preprocessor program; and, (5) sample test input data and the corresponding PPSP model output. The PPSP model is a steady-state, Gaussian plume point-source dispersion model for predicting ground-level concentrations of non-reactive, gaseous-like pollutants emitted in buoyant plumes from 'tall stacks' (from 100, to 300, above the ground) in flat terrain. Model evaluations by Weil and Brower (1982) indicate that the PPSP model is statistically superior to the CRSTER model in predicting short-term ground-level concentrations due to tall-stack releases during neutral or unstable atmospheric conditions.