Publications of Robin Glaude
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See detailWhat is impacting transboundary aquifers? Climate or global changes?
Brouyère, Serge ULiege; Goderniaux, Pascal; Glaude, Robin ULiege et al

Conference (2021, September 09)

In Eastern Belgium, one of the main groundwater reservoirs is located in Cretaceous chalk geological formations. The recharge zone of this aquifer corresponds to the Hesbaye chalk aquifer of the Geer ... [more ▼]

In Eastern Belgium, one of the main groundwater reservoirs is located in Cretaceous chalk geological formations. The recharge zone of this aquifer corresponds to the Hesbaye chalk aquifer of the Geer basin, in the Walloon region of Belgium (Groundwater body BERWM040). In Flanders, the chalk layer deepens to the North-West where it becomes confined under Tertiary sediments (Groundwater body BLKS_1100_GWL_1M). Groundwater from this chalk aquifer has been exploited for decades by different water companies, through pumping wells and galleries. These last decades, groundwater level time series have started to exhibit decreases, particularly in the recharge zone, when comparing the 1960-1990 and 1990-2020 periods. These decreases have been mostly attributed to first signals of climate change, with observed temperature increase and precipitation decrease, inducing a decrease of recharge. However, hydrogeological budgets calculated over different time periods for the Walloon part of the catchment have indicated increased water losses, attributed to a probable increase of groundwater abstraction in the Flemish part of the aquifer. All these results are reanalysed here in terms of water budget, evolution of groundwater levels and changes in indicators reflecting the pressure of groundwater abstraction on the evolution of groundwater reserves. Conclusions show that climate change is indeed a driver but increased anthropogenic pressure is also likely to be a key controlling factor. Based on this analysis, conclusions are drawn in terms of the need for efficient integrated transboundary management of such very important groundwater resources in a context of global change. [less ▲]

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See detailApplicability of Uncertainty analysis to groundwater environmental risks through Fault Tree Analysis and Monte Carlo simulations
Glaude, Robin ULiege

Master's dissertation (2020)

The Anthropocene epoch initiated by human influence on its Earth system (atmosphere, biosphere, hydrosphere) leads to an irreversible change: Global Warming. Since climate change would increase the ... [more ▼]

The Anthropocene epoch initiated by human influence on its Earth system (atmosphere, biosphere, hydrosphere) leads to an irreversible change: Global Warming. Since climate change would increase the occurence's probability of undesired events (sea level rise, floods, extreme droughts, etc...), it leads to the concept of environmental risk which refers in its most basic definition as the combination of the consequences of an undesired event (Vulnerability) and its probability of occurrence (Hazard). As a consequence, it is necessary to study this alteration of existing natural processes, including the ones related to hydrogeology, in a probabilistic maneer. This thesis aims to study the occurrence's probability of two particular groundwater risks. The first one is related to the generation of thermokarst lakes in permafrost environment and its subsequent thermal consequences in the surroundings. The second one concerns seawater intrusion which can induce saltwater contamination in abstracting wells. These processes are dependent of physical parameters to which is attached uncertainty. As a consequence, two uncertainty analysis methods have been applied to determine the failure's probability of these undesired events: Fault Tree Analysis and Monte Carlo Simulation. Beside the rough approximation performed to evaluate the probability of thermokarst lake generation (48%) and of talik development under these latter (73%) by means of Fault Tree Analysis, these high failure probabilities translate the urge to restrain Global Warming due to its irreversible effects on permafrost environment. These include the thawing of the permafrost and the consequent releasing of its trapped methane into the atmosphere. On the other hand, Monte Carlo simulations have been performed to compare different scenarii related to seawater intrusion in Akrotiri aquifer in Cyprus. The results once again translate the disastrous effect of climate change regarding the probability of occurence of these unwanted events. Indeed, a failure probability around 6 times greater (43%) is observed in the climate change scenario with respect to the reference scenario (7%). Uncertainty analysis is a good methodology to apply to environmental concerns to quantify the occurence's probability of these undesired events. This would urge public authorities to perform decision making in order to avoid or reduce the failure's probability of these groundwater issues that have irreversible consequences on its surrounding environment. [less ▲]

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