Table of Contents - The Atmospheric Studies Group at TRC
Table of Contents - The Atmospheric Studies Group at TRC Table of Contents - The Atmospheric Studies Group at TRC
Section 9: CALPUFF 9.8 User-Specified Deposition Velocity Data File (VD.DAT) The CALPUFF model requires that the user specify the method for determining dry deposition velocities for each species. In Input Group 3 of the control file, one of the following flags must be specified for each pollutant. 0 = no dry deposition (deposition velocities set to zero) 1 = resistance model used - pollutant deposited as a gas 2 = resistance model used - pollutant deposited as a particle 3 = user-specified deposition velocities used Note that different methods can be used for different pollutants in the same CALPUFF run. If any species are flagged as using "user-specified" deposition velocities, CALPUFF reads a formatted user-prepared data file with a 24-hour diurnal cycle of deposition velocities for each species flagged. The 24 values correspond to hours 01-24 (LST) of the simulated day. Twenty-four values must be entered for each flagged pollutant, even if the model run is for less than a full diurnal cycle. The units of the deposition velocities are m/s. An example of a user-specified VD.DAT file is shown in Table 9-34. The VD.DAT file uses a control file format (see Section 9.1). All text outside the delimiters (!) is considered as user comment information and is echoed back but otherwise ignored by the input module. Each data line consists of a delimiter followed by the species name, 24 deposition velocities, and a terminating delimiter. The data may extend over more than one line. The line being continued must end with a comma. The control file format allows the use of repetition factors (e.g., 3 * 1.0 instead of 1.0, 1.0, 1.0). The order in which the species are entered in the file is not important. However, the file must end with an input group terminator (i.e., !END!). The model checks that values have been entered for each species flagged as using user-specified deposition velocities. An error message is printed and execution of the run is terminated if any values are missing. The run will also terminate with an error message from the input routine if too many values are entered (i.e., more than 24 values for a particular pollutant). The species names must match those used in the chemical mechanism of the model. 9-212
Section 9: CALPUFF Table 9-34: Sample User-Specified Deposition Velocity File for Two Species DEPOSITION VELOCITY FILE (VD.DAT) --------------------------------- VD.DAT contains 24-hour diurnal cycle of deposition velocities for each species flagged as using user-specified values in the control file (CALPUFF.INP). The first value correspond to the period from 0:00 to 1:00, and the 24th value corresponds to 23:00-0:00. NOTE: Units are in m/s. ----------------------- SPECIES NAME Deposition Velocities (m/s) ------- --------------------------- ! HNO3 = 5*1.5e-2, 4*1.7e-2, 3*1.8e-2, 3*1.9e-2, 3*1.7e-2, 6*1.5e-2 ! ! SO2 = 5*0.8e-2, 13*1.0e-2, 6*0.8e-2 ! !END! 9-213
- Page 597 and 598: Section 9: CALPUFF Table 9-15 (cont
- Page 599 and 600: Section 9: CALPUFF 9.3 Point Source
- Page 601 and 602: Section 9: CALPUFF Table 9-17: PTEM
- Page 603 and 604: Section 9: CALPUFF Table 9-17 (Cont
- Page 605 and 606: Section 9: CALPUFF Table 9-18: PTEM
- Page 607 and 608: Section 9: CALPUFF Table 9-19: PTEM
- Page 609 and 610: Section 9: CALPUFF 9.4 Buoyant Area
- Page 611 and 612: Section 9: CALPUFF Table 9-21: BAEM
- Page 613 and 614: Section 9: CALPUFF . . . . . . . .
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- Page 617 and 618: Section 9: CALPUFF Table 9-24: Samp
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- Page 621 and 622: Section 9: CALPUFF Table 9-26: LNEM
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- Page 659 and 660: Section 9: CALPUFF Table 9-40: Samp
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- Page 663 and 664: Section 9: CALPUFF Table 9-43: HILL
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- Page 667 and 668: Section 9: CALPUFF where the follow
- Page 669 and 670: Section 9: CALPUFF 9.14 Mass Flux B
- Page 671 and 672: Section 9: CALPUFF Table 9-49: FLUX
- Page 673 and 674: Section 9: CALPUFF 9.15 CALPUFF Out
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- Page 677 and 678: Section 9: CALPUFF Table 9-52 (Cont
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Section 9: CALPUFF<br />
<strong>Table</strong> 9-34:<br />
Sample User-Specified Deposition Velocity File for Two Species<br />
DEPOSITION VELOCITY FILE (VD.DAT)<br />
---------------------------------<br />
VD.DAT contains 24-hour diurnal cycle <strong>of</strong> deposition velocities for each species flagged as using<br />
user-specified values in the control file (CALPUFF.INP).<br />
<strong>The</strong> first value correspond to the period from 0:00 to 1:00, and the 24th value corresponds to<br />
23:00-0:00.<br />
NOTE: Units are in m/s.<br />
-----------------------<br />
SPECIES<br />
NAME<br />
Deposition Velocities (m/s)<br />
------- ---------------------------<br />
! HNO3 = 5*1.5e-2, 4*1.7e-2, 3*1.8e-2, 3*1.9e-2, 3*1.7e-2, 6*1.5e-2 !<br />
! SO2 = 5*0.8e-2, 13*1.0e-2, 6*0.8e-2 !<br />
!END!<br />
9-213