Generic Guidance and Optimum Model Settings for the CALPUFF ...
Generic Guidance and Optimum Model Settings for the CALPUFF ...
Generic Guidance and Optimum Model Settings for the CALPUFF ...
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AERMOD<br />
BLP<br />
60 70 80 90 95 98 99<br />
Cumulative Frequency (%)<br />
99.8 99.9 99.99<br />
10<br />
99.999<br />
29<br />
<strong>CALPUFF</strong><br />
Observations<br />
Figure 3-8. Predictions of 1-hour average SO2 concentrations at <strong>the</strong> downwind Alcoa<br />
Tennessee monitor <strong>for</strong> 1977 versus Observations <strong>and</strong> models, <strong>CALPUFF</strong>, BLP <strong>and</strong><br />
AERMOD. The BLP results based on Version 1.1 of <strong>the</strong> model as well as <strong>the</strong> current<br />
version of BLP on <strong>the</strong> U.S. EPA web site (with modifications to <strong>the</strong> meteorological file to<br />
allow it to run) are shown. <strong>CALPUFF</strong> closely matches BLP results while AERMOD<br />
significantly overpredicts <strong>the</strong> observed concentration measurements.<br />
Table 3-1. Annual Average SO2 Concentrations (µg/m 3 ) at Alcoa, TN <strong>for</strong> 1976 <strong>and</strong> 1977.<br />
Observed <strong>and</strong> predicted concentrations using <strong>the</strong> BLP, <strong>CALPUFF</strong> <strong>and</strong> AERMOD<br />
models.<br />
1976 1977<br />
Observed 8 13<br />
<strong>CALPUFF</strong> 15.8 18.5<br />
BLP 17.1 19.6<br />
AERMOD 116.2 114.2<br />
1300<br />
1200<br />
1100<br />
1000<br />
900<br />
800<br />
700<br />
600<br />
500<br />
400<br />
300<br />
200<br />
100<br />
90<br />
80<br />
70<br />
60<br />
50<br />
40<br />
30<br />
20<br />
Concentrations (�g/m 3 )
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