get_dv: Calculate SO2 Design value
In jlovegren0/aermod: Work with AERMOD POST files
Description
Usage
Arguments
Details
Value
Description
Calculate the 2010 SO2 NAAQS design value for an impact matrix. The impact matrix should have rows corresponding to the number of hours in a five-year meteorological database (e.g., 43848 hours for 2016–2020). The number of receptors (columns) can be arbitrary.
Usage
1
Arguments
mat
An impact matrix, typically a linear combination of impact matrices, which may be the result of a Monte Carlo simulation.
diag
Do not report full calculation. Instead, output a tibble giving the top four daily highs at each receptor x year.
Details
Per EPA's 2014 guidance (pp. A-24–A-25), the calculation is carried out as follows:
At each receptor, for each hour of the modeled period, calculate a total concentration
across all sources including backgro1md concentrations if applicable. This can be done in
AERMOD using SRCGROUP ALL or by adding individual source groups outside of
AERMOD, using hourly POSTFILEs. If the user is totaling the concentrations outside of
AERMOD, the source groups used in the calculations need to be mutually exclusive, i.e.
no one source should be in multiple source groups.
From the total concentrations calculated in step 1, obtain the 1-hr maximum
concentration at each receptor for each modeled day.
From the output of step 2, for each year modeled, calculate the 99th percentile (4th
highest) daily maximum 1-hour concentration at each receptor. If modeling 5 years of
meteorological data, this results in five 99th percentile concentrations at each receptor.
Average the 99th percentile (or 4th highest) concentrations across the modeled years to
obtain a design value at each receptor.
Modeled source contributions to a NAAQS violation can be determined by analyzing the
hourly concentrations from the individual source groups POSTFILES corresponding to
the same hour as the 4th daily maximum 1-hour concentration from each year. See 75 FR
at 35540.
Value
A double corresponding to the calculated design value.
jlovegren0/aermod documentation built on Jan. 14, 2022, 8:06 a.m.
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Description Usage Arguments Details Value
Description
Calculate the 2010 SO2 NAAQS design value for an impact matrix. The impact matrix should have rows corresponding to the number of hours in a five-year meteorological database (e.g., 43848 hours for 2016–2020). The number of receptors (columns) can be arbitrary.
Usage
1 |
Arguments
mat |
An impact matrix, typically a linear combination of impact matrices, which may be the result of a Monte Carlo simulation. |
diag |
Do not report full calculation. Instead, output a tibble giving the top four daily highs at each receptor x year. |
Details
Per EPA's 2014 guidance (pp. A-24–A-25), the calculation is carried out as follows:
At each receptor, for each hour of the modeled period, calculate a total concentration across all sources including backgro1md concentrations if applicable. This can be done in AERMOD using SRCGROUP ALL or by adding individual source groups outside of AERMOD, using hourly POSTFILEs. If the user is totaling the concentrations outside of AERMOD, the source groups used in the calculations need to be mutually exclusive, i.e. no one source should be in multiple source groups.
From the total concentrations calculated in step 1, obtain the 1-hr maximum concentration at each receptor for each modeled day.
From the output of step 2, for each year modeled, calculate the 99th percentile (4th highest) daily maximum 1-hour concentration at each receptor. If modeling 5 years of meteorological data, this results in five 99th percentile concentrations at each receptor.
Average the 99th percentile (or 4th highest) concentrations across the modeled years to obtain a design value at each receptor.
Modeled source contributions to a NAAQS violation can be determined by analyzing the hourly concentrations from the individual source groups POSTFILES corresponding to the same hour as the 4th daily maximum 1-hour concentration from each year. See 75 FR at 35540.
Value
A double corresponding to the calculated design value.
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