New publication from Gael Dumont

Our latest publication goes to Gael, congrats!, on the use of geophysics to infer gravimetric water content in municipal landfills. The time spent on the field was worth it…:)

You will find the publication on our instituionnal website ORBI as well as on our researchgate page.

WM

Collaborating in Africa: a case study from Burkina Faso

A recent publication by Elie Sauret in the Journal of Applied Geophysics addresses the problem of characterizing the water resources in a shallow alluvial plain in order to identify better locations for groundwater abstraction. This study has investigated the potential use of combined electrical resistivity tomography (ERT) and
horizontal-to-vertical spectral ratio (HVSR) to characterize the heterogeneity and thickness of superficial deposits deployed along the Kou river in Burkina Faso.

You will find the complete text upon request here through our ORBI server at the University.

Capture_Sauret2015.

Our next publication goes to…

David Caterina and Thibaut Masy. Congratulations for your upcoming publication in Journal of Contaminant Hydrology entitled  “Electrical Resistivity Tomography to monitor enhanced biodegradation of hydrocarbons with Rhodococcus erythropolis T902.1 at a pilot scale”.  You can find more of David’s work here.

Abstract:

Petroleum hydrocarbons (HC) represent the most widespread contaminants and in-situ bioremediation remains a competitive treatment in terms of cost and environmental concerns. However, the efficiency of such a technique (by biostimulation or bioaugmentation) strongly depends on the environment affected and is still difficult to predict a priori. In order to overcome these uncertainties, Electrical Resistivity Tomography (ERT) appears as a valuable non-invasive tool to detect soil heterogeneities and to monitor biodegradation. The main objective of this study was to isolate an electrical signal linked to an enhanced bacterial activity with ERT, in an aged HC-contaminated clayey loam soil. To achieve this, a pilot tank was built to mimic field conditions. Compared to a first insufficient biostimulation phase, bioaugmentation with Rhodococcus erythropolis T902.1 led to a HC depletion of almost 80% (6900 to 1600  ppm) in 3  months in the center of the contaminated zone, where pollutants were less bioavailable. In the meantime, lithological heterogeneities and microbial activities (growth and biosurfactant production) were successively discriminated by ERT images. In the future, this cost-effective technique should be more and more transferred to the field in order to monitor biodegradation processes and assist in selecting the most appropriate remediation technique.

Here is a small teeaser:

TAnk_Caterina

Latest publication

Our latest publication goes to Dr. T. Hermans with his review paper on the use of applied geophysics to study geothermal systems.  You may find the full text of the article here or here.

Enjoy reading it! If the topic is of interest to you, please check also this post.

Abstract: Low enthalpy geothermal systems exploited with ground source heat pumps or groundwater heat pumps present many advantages within the context of sustainable energy use. Designing, monitoring and controlling such systems requires the measurement of spatially distributed temperature fields and the knowledge of the parameters governing groundwater flow (permeability and specific storage) and heat transport (thermal conductivity and volumetric thermal capacity). Such data are often scarce or not available. In recent years, the ability of electrical resistivity tomography (ERT), self-potential method (SP) and distributed temperature sensing (DTS) to monitor spatially and temporally temperature changes in the subsurface has been investigated. We review the recent advances in using these three methods for this type of shallow applications. A special focus is made regarding the petrophysical relationships and on underlying assumptions generally needed for a quantitative interpretation of these geophysical data. We show that those geophysical methods are mature to be used within the context of temperature monitoring and that a combination of them may be the best choice regarding control and validation issues.

energies-07-05083-ag