GWT-MST¶
Structure of Blocks¶
FOR EACH SIMULATION
BEGIN OPTIONS
[SAVE_FLOWS]
[FIRST_ORDER_DECAY]
[ZERO_ORDER_DECAY]
[SORBTION]
END OPTIONS
BEGIN GRIDDATA
POROSITY [LAYERED]
<porosity(nodes)> -- READARRAY
[DECAY [LAYERED]
<decay(nodes)> -- READARRAY]
[DECAY_SORBED [LAYERED]
<decay_sorbed(nodes)> -- READARRAY]
[BULK_DENSITY [LAYERED]
<bulk_density(nodes)> -- READARRAY]
[DISTCOEF [LAYERED]
<distcoef(nodes)> -- READARRAY]
END GRIDDATA
Explanation of Variables¶
Block: OPTIONS¶
SAVE_FLOWS
keyword to indicate that MST flow terms will be written to the file specified with “BUDGET FILEOUT” in Output Control.FIRST_ORDER_DECAY
is a text keyword to indicate that first-order decay will occur. Use of this keyword requires that DECAY and DECAY_SORBED (if sorbtion is active) are specified in the GRIDDATA block.ZERO_ORDER_DECAY
is a text keyword to indicate that zero-order decay will occur. Use of this keyword requires that DECAY and DECAY_SORBED (if sorbtion is active) are specified in the GRIDDATA block.SORBTION
is a text keyword to indicate that sorbtion will be activated. Use of this keyword requires that BULK_DENSITY and DISTCOEF are specified in the GRIDDATA block.
Block: GRIDDATA¶
porosity
is the aquifer porosity.decay
is the rate coefficient for first or zero-order decay for the aqueous phase of the mobile domain. A negative value indicates solute production. The dimensions of decay for first-order decay is one over time. The dimensions of decay for zero-order decay is mass per length cubed per time. decay will have no affect on simulation results unless either first- or zero-order decay is specified in the options block.decay_sorbed
is the rate coefficient for first or zero-order decay for the sorbed phase of the mobile domain. A negative value indicates solute production. The dimensions of decay_sorbed for first-order decay is one over time. The dimensions of decay_sorbed for zero-order decay is mass of solute per mass of aquifer per time. If decay_sorbed is not specified and both decay and sorbtion are active, then the sorbed decay rate will be set equal to the aqueous decay rate. decay_sorbed will have no affect on simulation results unless the SORPTION keyword and either first- or zero-order decay are specified in the options block.bulk_density
is the bulk density of the aquifer in mass per length cubed. bulk_density is not required unless the SORBTION keyword is specified.distcoef
is the distribution coefficient for the equilibrium-controlled linear sorption isotherm in dimensions of length cubed per mass. distcoef is not required unless the SORBTION keyword is specified.
Example Input File¶
BEGIN OPTIONS
SORBTION
FIRST_ORDER_DECAY
END OPTIONS
BEGIN GRIDDATA
POROSITY
CONSTANT 0.1
DECAY
CONSTANT 0.001
DECAY_SORBED
CONSTANT 0.001
BULK_DENSITY
CONSTANT 1.
DISTCOEF
CONSTANT 0.01
END GRIDDATA