Push-pull tracer tests: their information content and use for characterizing non-Fickian, mobile-immobile behavior

Summary

discrete-site 1-D CTRW. This perspective allows us to make statements about what may be invisible (most commonly, the heterogeneous hydraulic conductivity field, orK-field), and what is certainly visible (to wit, mobile-immobile behavior). It is shown how to quantify the latter, and a simple subordination technique is presented for modification of an existing model which captures only heterogeneous advection in order to add the mobile-immobile trapping behavior characterized by the push-pull test.

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