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. Modeling fluidflow and solute transport dynamics in fractured karst aquifers is one of themost challenging tasks in hydrogeology. The present study investigates the hotspots of groundwater contamination inthe industrial area of Modugno (Bari – southern Italy), where the limestoneaquifer has a fractured and karstic nature. A rough walled parallel plate model coupled with a geostatistical analysis toinfer the values of the equivalent aperture has been implemented andcalibrated on the basis of piezometric data. Using the random walk theory,the steady-state distribution of hypothetical contamination with the sourceat the hotspot has been carried out, reproducing a pollution scenario whichis compatible with the observed one. From an analysis of the flow andtransport pattern it is possible to infer that the anticline affecting theCalcare di Bari formation in direction ENE–WSW influences the direction offlow as well as the propagation of the contaminant. The results also show that the presence of nonlinear flow influencesadvection, in that it leads to a delay in solute transport with respect tothe linear flow assumption. This is due to the non-constant distribution ofsolutes according to different pathways for fractured media which is relatedto the flow rate.

Numerical modeling of flow and transport in the Bari industrial area by means of rough walled parallel plate and random walk models