ORBi Open Repository and Bibliography
In may 2007, the ULg's Administrative Board (joined in June 2007 by the FUSAGx) decided to create an institutional repository and defined a strong institutional self-archiving policy to increase the visibility, accessibility and impact of the University's publications (Board's decision).
This decision led to the official launch, in November 2008, of the ORBi platform including both the Academic Bibliography and the Institutional Repository of the Wallonia-Europe University Academy.
Time-lapse inversion of ERT monitoring data using variogram-based regularization - Hermans, Thomas; Dumont, Gaël; Kemna, Andreas; Nguyen, Frédéric
Hydrogeophysics has become a major field of research in the past two decades and time-lapse electrical resistivity tomography (ERT) is one of the most popular techniques to monitor passive and active processes in subsurface reservoirs. Time-lapse inversion schemes have been developed to refine inversion results; but, in contrast with static inversion, they mostly still rely on the spatial regularization procedure based on the standard smoothness constraint. In this contribution, we propose to apply a variogram-based regularization operator in the time-lapse ERT inverse problem, using the model difference covariance matrix to replace the standard smoothing operator. The variogram of resistivity variations...
Use of dual carbon-chlorine isotope analysis to identify degradation pathways of 1,1,1-trichloroethane in groundwater - Palau, Jordi; Jamin, Pierre; Badin, Alice; Shouakar-Stash, Orfan; Brouyère, Serge; Hunkeler, Daniel
The high susceptibility of chlorinated aliphatic hydrocarbons (CAHs) like 1,1,1-trichloroethane (1,1,1-TCA) to be transformed via different competing pathways (biotic and abiotic) complicates the assessment of their fate in groundwater. This knowledge is necessary to evaluate contaminant degradation and potential formation of toxic intermediates. Identifying pathways is further complicated in sites contaminated by mixed CAHs because some degradation products of 1,1,1-TCA can be formed from different precursors. Here, identification of pathways based
solely on substrate-product concentration relationships may lead to ambiguous interpretations.
This study investigates, for the first time, dual C−Cl isotope fractionation as a means of identifying and assessing
degradation pathways of 1,1,1-TCA...