What is it?
Contaminant transport modeling requires prescribing the initial/current extent of the plume and the concentrations observed within the plume. IGW-NET allows users to save and load then results of plume modeling as an initial condition for further transport modeling.How to use it:
Check the box next to ‘Use Parent Conc as Initial Conc’, then select ‘Instantaneous’ or ‘Continuous’ to assign a (delta-function) source concentration or a continuous concentration, respectively.Cutoff Concentration
Continuous Source:This value is used as a 'threshold value' to control the extent of the 'initial plume'. In other words, for model cells with a simulated concentration less than the cutoff concentration, the initial concentration is set equal to zero. For cells with simulated concentrations above the cutoff concentration, the intial concentration is assigned as the simulated concentration for that cell.
Instantaneous Source:
In this case, simulated concentrations greater than the cutoff concentration will be used as a continuous source condition, and simulated concetrations less than the cutoff concentration will be used as instantaneous source.
If you want to treat the entire initial plume as an instantaneous source, a value greater than Cmax should be assigned to as the cutoff concentration(where Cmax is maximum concentration in the uploaded file, or an arbitrary large number).