34.14. Plume Release File

The plume release file is an ASCII file containing the parameters describing the gas release to the DIRSIG simulation. This file describes where the plume release occurs, what materials are released and the various rates and local meteorological parameters. Unfortunately, there is not a GUI interface for the release file at this time, so these files it must be created and edited by hand.

An example file is shown below:

  GPI_RELEASE
  #
  # Information about the stack:
  #     LOCATION - 3D location of stack base
  #     HEIGHT - the height of the stack [m]
  #     DIAMETER - the diameter of the stack [m]
  STACK {
      LOCATION = 582.0, 741.0, 118.754
      HEIGHT   = 20.25
      DIAMETER = .8128
  }

  #
  # Information about the effluent compounds released by the stack.  Each
  # COMPOUND section includes the name of the gas, its molecular weight [g/mol]
  # and the name of the spectral absorption coefficient file.
  #
  EFFLUENTS {
      COMPOUND {
	  NAME = sf6_25t
	  WEIGHT = 146.0
      }
  }
  #
  # Temporal information about the stack release.
  # [time] [exit vel] [exit temp] [air temp] [atm stab] [rate1]
  #
  # TIME - ISO8601 date and time
  # EXIT VELOCITY = Flow velocity at stack [m/s]
  # EXIT TEMPERATURE - Effluent temperature at the stack [K]
  # AIR TEMPERATURE - Ambient air temperature [K]
  # WIND VELOCITY - Wind velocity [m/s]
  # WIND DIRECTION - Wind direction [degrees]
  # ATM STABILITY - Pasquill-Gifford stability number (10, 20, 30, 40, 50, 60)
  # RATES - List of release rates for each gas [g/s]
  #
  # [time] [exit vel] [exit temp] [air temp] [wind vel] [wind dir] [atm stab] [rate1]
  RELEASE {
  0.0 5.0 350. 301.15 3.6 0 40 4.0
  }