Analysis Modes

BREEZE's Downwash Analyst provides five interactive visualization modes to help modelers better understand 1) how the EPA's BPIP processor computes the spatial relationships between multiple tiers and stacks (i.e. computes the BPIPs), and 2) how the BPIPs are used by AERMOD-PRIME to compute plume downwash.

Four BPIP Analysis Modes:

Question #1 - Which single tier, or tier group, most influences (i.e. produces the maximum GEP height for) a specific stack and a specific wind direction?

Answer - BPIP GEP - Select Stack & Wind Direction - Displays the single-tier or tier-group, with it's GEP-SIZ, that produces the maximum GEP stack height for a selected stack and a selected wind direction.

Question #2 - What is the maximum stack GEP height for each stack (due to which single-tier or tier-group, and in what wind direction)?

Answer - BPIP GEP Max - Select Stack - Displays the single-tier or tier-group, with it's GEP-SIZ, and the single wind direction that produces the maximum GEP height for a selected stack.

Question #3 - Which single tier, or tier group, most influences (i.e. produces the maximum HWE for) a specific stack and a specific wind direction ?

Answer - BPIP HWE - Select Stack & Wind Direction - Displays the single-tier or tier-group, with it's HWE-SIZ, that produces the maximum HWE for a selected stack and a selected wind direction.

Question #4 - What do the BPIPs for a specific stack and a specific wind direction look like and were they produced from a single-tier or tier-group?

Answer - BPIP Output - Select Stack & Wind Direction - Displays the single-tier or tier-group that produces the maximum HWE and it's corresponding BPIPs (i.e. profile box with height, width, length, and X,Y offsets) for a selected stack and a selected wind direction.

PRIME Plume Downwash Analysis Mode:

Question #5 - What does the downwash-affected plume produced by the AERMOD-PRIME model look like relative to the BPIP building profile parameters and the shape of the building cavity and far-wake boundaries?

Answer - PRM Plume - Select Stack & Time - Use BREEZE AERMOD to generate a PRIME plume downwash file (see the AERMOD | Input Menu | Output Options | Other File & Options). Load the file into Downwash Analyst to observe how the BPIP building profile parameters are used to generate the wake boundary, cavity boundary, and downwash-modified plume. Observe all hourly downwash (i.e. plume) geometry by selecting both a stack and a time, in either the 3D Display or the side-view Chart display.

Page url: http://www.breeze-software.com/prod/aermod-isc/help/index.html?bpip_analysis_modes.htm