I run a model on an aquifer with 3 layers. the contaminant is leaching on the upper layer. At the point of entry, the contaminant concentration is constant at 0.1 mg/m³.
I am having a hard time selecting the appropriate option in Sink/Source Concentration under MT3DMS/SEAWAT model as the options available are Constant head cells, well, river, and time-variant specified concentration.
Also, no recharge is applied to this model.
Check this website
https://hatarilabs.com/ih-en/x-tutorials-of-contaminant-transport-modeling-in-modflow-and-mt3dms-mt3d
Please review your conceptual model. If there is no recharge at the top model layer, how can we assume a constant contaminant source? When we say contaminant of 0.1 mg/m3, it means that 0.1 mg of contaminant in 1 m3 of water, so there should be a flux of water that will take the contaminant within the aquifer/model.
With the recharge, you may use a point source or 'recharge concentration' for the contaminant.
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