Concentration / Setup Run / Deposition Definitions

This section is used to define the deposition parameters for emitted pollutants. The number of deposition definitions must correspond with the number of pollutants released. There is a one-to-one correspondence. There are 5 entries in the CONTROL file for each defined pollutant. The lines 27(1) through 31(5) correspond with each of the menu items shown in the illustration below. The radio-buttons along the top can be used to set default deposition parameters, which can then be edited as required in the text entry section. The second line of radio-buttons define the deposition values for some preconfigured species: Cesium, Iodine (gaseous and particiulate), and Tritium. The reset button sets all deposition parameters back to zero.

Note that turning on deposition will result in the removal of mass and the corresponding reduction in air concentration, the deposition will not be available in any output unless height "0" is defined as one of the concentration grid levels.

26 - Number of pollutants depositing

27(1)- Particle: Diameter (µm), Density (g/cc), and Shape

28(2)- Deposition velocity (m/s), Pollutant molecular weight (Gram/Mole), Surface Reactivity Ratio, Diffusivity Ratio, Effective Henry's Constant

Note that the normal deposition mode is for particles to lose mass to deposition when those particles are within the deposition layer. Thus deposition will not decrease the number of computational particles in the model, but only decrease the amount of mass carried on the particles. An option to deposit the entire particle's mass at the surface (the particle is removed) when subjected to deposition is available. See Deposition nd Decay for further information.

29(3)- Wet Removal: Actual Henry's constant, In-cloud (GT 1 =L/L; LT 1 =1/s), Below-cloud (1/s)

30(4)- Radioactive decay half-life (days)

31(5)- Pollutant Resuspension (1/m)


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