Simulation of DNAPL infiltration and spreading behaviour in the saturated zone at varying flow velocities and alternating subsurface geometries |
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| Authors: | Katharina Erning Sibylle Grandel Andreas Dahmke Dirk Schäfer |
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| Institution: | (1) Christian-Albrechts University of Kiel, Ludewig-Meyn-Strasse 10, 24118 Kiel, Germany;(2) Present address: Deutsche Forschungsgemeinschaft, Kennedyallee 40, 53175 Bonn, Germany |
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| Abstract: | The influence of varying groundwater flow velocities on DNAPL infiltration and spreading behaviour was investigated by multiphase
modelling using TMVOC and PetraSim. The multiphase models were calibrated by results of previously conducted laboratory experiments
for the complete spatio-temporal range of the experiments. The small scale 2D scenario modelling was applied to qualify and
quantify changes in position, architecture, geometry and dissolution of a TCE body in a fully saturated homogeneous sandy
medium. The applied flow velocities ranging from 0.05 up to 40.00 m/day exhibited that the DNAPL TCE is affected even at the
lowest flow velocity in its position, its size and its architecture. Additionally, several impermeable lenses with simple
geometry were assumed in the model, to investigate the influence of stratified subsoil. In the experimental set-ups, the DNAPL
body reacts more sensitive to the applied groundwater flow velocities than to the geometrical set-up of the scenarios. A possible
consequence can be the transportation and displacement of a DNAPL pool due to natural or anthropogenic induced high groundwater
flow velocities, as by Pump and Treat facilities, complicating site investigation process and planning of remediation activities. |
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