Cambridge Environmental Research Consultants (CERC)

ADMS 5 Buildings Validation AGA Experiments

The American Gas Association (AGA) experiments1 [1] occurred during spring and summer 1980 at gas compressor stations in Texas and Kansas. At each test facility, one of the gas compressor stacks was retrofitted to accommodate SF6 tracer gas emissions. In addition, stack height extensions were provided for some of the experiments (with the normal stack height close to 10 m). The stack height to building height ratios for the tests ranged from 0.95 to 2.52.

There were a total of 63 tracer releases over the course of the tests, and the tracer samplers were located between 50 and 200 m away from the release point. Figure 1 shows the experimental set up at the Kansas site.

An instrumented 10-m tower was operated at both experimental sites. The tracer releases were generally restricted to daytime hours. Meteorological conditions were mainly unstable. Wind speeds ranged from 2 to 11 m/s over the 35 hours. The input data for the ADMS runs were taken from the AERMOD files downloaded from the United States Environmental Protection Agency website [3]. These data included the arcwise maximum observed concentrations that have been used for comparison with the ADMS modelled concentrations.

This document compares the results of ADMS (hereafter referred to as ADMS 5.0) with those of ADMS (hereafter referred to as ADMS 4.2).