Evaluation and Sensitivity Study of the MATHEW/ADPIC Models Using EPRI Plains Site Data for a Tall Stack

摘要

We have selected 3 of the 13 EPRI Plains Site intensive measurement periods for study; the 3 data sets are representative of a morning transition, daytime and an evening transition. For each period, we: (1) used measured plume heights, when available; (2) screened all meteorological input, especially the upper air winds; (3) used measured sigma/sub theta/ values from the 100 m meteorological tower with an extrapolated sigma/sub theta/ at the top of the computational grid; (4) employed a better boundary condition on the surface concentrations; and (5) used the latest version of MATHEW/ADPIC. With these changes calculated maximum SF sub 6 concentrations, paired in time but not in space, show much better correspondence to measurements than the earlier SAI calculations. A similar comparison between measurements and calculations using Briggs' plume heights indicates that using Briggs' formulation gives results that are inferior to calculations using measured plume heights. However, comparison of our calculations (paired in space and time) using measured vs Briggs' plume heights, with no changes in other input values, show only minor differences. This may largely be due to the type of ratio analysis used which weighs all samplers equally, regardless of the concentration level. 10 references, 6 figures, 3 tables. (ERA citation 10:010377)