Answer from FEFLOW if someone is interested in this topic:
it is not right to divide mean age flux period budget by fluid flux period budget. You can divide mean age flux budget by fluid flux budget for a MLW, in which case you will obtain a flux-averaged mean age (some kind of average of mean ages in the well), similar to the so-called flux-concentration. Since at the well nodes the dispersive part of mean age flux is neglected, you should obtain a pure fluid-flux weighted concentration
I want to calculate the mean water age of the well water in a transient age transport model. The observation point at the same node like the multilayer well calculates a mean local age of a few days, while the other observation points near there show values about some years. Therefore I want to now how to get the right water age of the water pumped out of the multilayer well. Is it right to divide the Age-mass period budget [m³/d] with the Fluid Period Budget [m³] of the multilayer well to obtain the age [d] of the water pumped out?
Thank you for your reply! I am using the DF in combination with Dual Node Connectors (DNC). Therefore the tracks of the particles running through the DF are not shown in the matrix elements. Is there a way to show the tracks of the particles running through the DF in spite of the DNC?
is it possible to use the random walk method to analyse the flowpaths in a groundwater flow model with discrete feature elements as fractures? I mean, can the particles be displayed also in the discrete feature elements in the 3D view after running the model?