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Three Dimensional Time Lapse Monitoring of a Saline Tracer in an Experimental Tank
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Near Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics, Sep 2015, Volume 2015, p.1 - 5
Abstract
We present a 4D geoelectrical time lapse experiment simulating the movement of olive oil mill wastes into a sequence of impermeable (fine sand) to permeable (medium sand) formations. Prior to the full experimental set-up a smaller scale test took place in a small experimental aquarium in order to simulate the movement of the saline tracer. The actual experiment involved a large (one cub. meter) tank instrumented with electrodes deployed in six vertical and two horizontal boreholes. A saline tracer was injected in to the saturated permeable medium and its movement was monitored by collecting 21 time-lapse full 3D ERT data sets. Data were processed using a 4D inversion algorithm and the time lapse geoelectrical images captured the red dye tracer movement. The laboratory experiment confirmed that the 4D approach provided improved time-lapse monitoring of changes in a real system. The above model will be used to extract hydrogeological parameters and create a model of the saline tracer flow and evaluate the applicability of ERT monitoring in this context.