Sofia Åkesson

Background: MSc in Geology at Lund University

My project:

I am focusing on the degradation processes of chlorinated solvents, both natural and stimulated, where my main medium is groundwater. We know that induced polarization (IP) signals can help us visualize changes in the contamination over time in the ground (see Fig. 1).However, we are not sure what is giving rise to the signal and why or how it changes. To be able to answer these questions, I am working on characterizing changes in groundwater pollutants and changes of major ions within them. I will also investigate the microbial activity involved in the degradation process as well as compound-specific isotope data of carbon to quantify the degradation. To completely understand the changes in the IP-signals, we need to study the distribution and relationship of dissolved pollutants and adhesion to the grains. Over time, the contamination will move, therefore the dispersal patterns need to be understood and kept in mind when interpreting our IP-data.

Fig 1. An IP-survey over a CAH contamination, measured over time to investigate changes within the in-situ treated source zone (Sparrenbom C.J.et al., STOTEN 575 (2017) 767–778).

Line Meldgaard

Background:

MSc in Geophysics (2016) from Aarhus University, Denmark.
http://pure.au.dk/portal/en/persons/id(9e5e14d1-c032-4469-bde5-e1fba2710bf2).html

My project:
The aim of the PhD project is to develop an algorithm for forward modelling and inversion of three-dimensional direct current (DC) and induced polarization (IP) data. The inversion code will be applied to field data to retrieve three-dimensional models of the subsurface geology, hydraulic permeability, and possible contamination.

The PhD project is carried out in the HydroGeophysics Group at Aarhus University.

PhD finish 2019