Block PARTICLE_AGGREGATION

This block is used by task SetSrc and controls particle aggregation and cut-off (for categories particles and radionuclides only)

  1. PARTICLE_CUT_OFF = (options)
    • Specifies a cut off diamater
    • Input options:
      • NONE: No cut-off used
      • FI_LOWER_THAN (float): Define an upper cut-off limit in phi units
      • FI_LARGER_THAN (float): Define a lower cut-off limit in phi units
      • D_(MIC)_LARGER_THAN (float): Define an upper cut-off limit for diameter in microns
      • D_(MIC)_LOWER_THAN (float): Define a lower cut-off limit for diameter in microns
  2. AGGREGATION_MODEL = (options)
    • Define a particle aggregation parametrization
    • Input options:
      • NONE: No aggregation
      • CORNELL: Cornell model (Cornell et al., 1983)
      • COSTA: Costa model (Costa et al., 2010). Valid only for tephra particles and PLUME source type
      • PERCENTAGE: Percentage model (Sulpizio et al., 2012)
  3. NUMBER_OF_AGGREGATE_BINS = (integer)
    • Number of aggregate bins (default value is 1)
    • Note: Only used if AGGREGATION_MODEL!=NONE
  4. DIAMETER_AGGREGATES_(MIC) = (float_list)
    • Diameter of aggregate bins in microns
    • Note: Only used if AGGREGATION_MODEL!=NONE
  5. DENSITY_AGGREGATES_(KGM3) = (float_list)
    • Density of aggregate bins in kg m-3
    • Note: Only used if AGGREGATION_MODEL!=NONE
  6. PERCENTAGE_(%) = (float_list)
    • Percentage of aggregate bins
    • Note: Only used if AGGREGATION_MODEL=PERCENTAGE
  7. VSET_FACTOR = (float)
    • Multiplicative correction factor for settling velocity of aggregates
    • Note: Only used if AGGREGATION_MODEL=PERCENTAGE
  8. FRACTAL_EXPONENT = (float)
    • Fractal exponent (see Costa et al., 2010 for details)
    • Note: Only used if AGGREGATION_MODEL=COSTA