MODELLAZIONE MULTIFASE DELL’INFLUENZA DELLA VELOCITA’ REALE DELL’ACQUA DI FALDA SULLA MIGRAZIONE DI DNAPL NELL’ACQUIFERO POROSO MULTIFALDA DI RHO, ITALIA — IJEGE
 
 
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MULTIPHASE MODELING OF THE IMPACT OF GROUNDWATER PORE VELOCITIES ON DNAPL MIGRATION IN THE MULTI-AQUIFER FORMATION OF RHO, ITALY



Abstract:
2D multiphase modeling of DNAPL behavior in realistic subsurface morphology of the former industrial site Chimica di Bianchi provided evidence, that moderate groundwater pore velocities are sufficient to transport a TCE phase body over large distances in the downstream direction. In the investigated model set-up, the DNAPL was found to be able to counteract the morphological effects of a slope of 2.5 and leave depressions and trenches. The displacement depends directly on the encountered hydraulic pressure regime. Moreover, only materials with a hydraulic conductivity lower than 1 × 10-9 m/s were impermeable to the DNAPL over a time period of 75 years. The modeling approach presented in this study provides an explanation for the inaccurate, or often even unknown, position of DNAPL source zones at many industrial sites. Furthermore, by narrowing down possible locations, the simulations proved to be a valuable tool for both investigation and remediation activities of DNAPL contaminated sites.

Authors:
Katharina Erning - University of Kiel, Institute of Geosciences - Ludewig-Meyn-Strasse 10 - D-24118 Kiel, Germany
Andreas Dahmke - University of Kiel, Institute of Geosciences - Ludewig-Meyn-Strasse 10 - D-24118 Kiel, Germany
Dirk Schäfer - University of Kiel, Institute of Geosciences - Ludewig-Meyn-Strasse 10 - D-24118 Kiel, Germany
Keywords
multiphase modeling, DNAPL, TCE, groundwater velocity, morphology, aquitard
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