References of "Brouyère, Serge"
     in
Bookmark and Share    
Full Text
See detailChapter in Basin report for Meuse case on updated research questions and detailed research plan for month 25-42, including a new work package description
Joziasse, Jan; Vink, Jos; Kessels, Eric et al

Report (2006)

The work plan for the period Month 25 – 42 is presented in this deliverable. The activities foreseen are a logical follow-up of the past activities, so no major updates compared to the previous ... [more ▼]

The work plan for the period Month 25 – 42 is presented in this deliverable. The activities foreseen are a logical follow-up of the past activities, so no major updates compared to the previous description of work (covering months 13 – 24) was needed. [less ▲]

Detailed reference viewed: 9 (1 ULg)
Full Text
See detailDescription of hydrogeological conditions in the Geer sub-catchment and synthesis of available data for groundwater modelling
Orban, Philippe ULg; Batlle-Aguilar, Jordi; Goderniaux, Pascal ULg et al

Report (2006)

In the framework of Workpackage R3 Meuse, the Hydrogeology Group of the University of Liège (HGULg) will develop a groundwater flow and transport model for the Geer sub-catchment (tributary of the Meuse ... [more ▼]

In the framework of Workpackage R3 Meuse, the Hydrogeology Group of the University of Liège (HGULg) will develop a groundwater flow and transport model for the Geer sub-catchment (tributary of the Meuse). This model will be used for collaborations HYDRO H1 and TREND T2. The deliverable describes the hydrogeological conditions prevailing in the sub-catchment and provides a synthesis of available data for groundwater and transport modelling. [less ▲]

Detailed reference viewed: 22 (2 ULg)
Full Text
Peer Reviewed
See detailModelling the migration of contaminants through variably saturated dual-porosity, dual-permeability chalk
Brouyère, Serge ULg

in Journal of Contaminant Hydrology (2006), 82(3-4), 195-219

In the Hesbaye region in Belgium, tracer tests performed in variably saturated fissured chalk rocks presented very contrasting results in terms of transit times, according to artificially controlled water ... [more ▼]

In the Hesbaye region in Belgium, tracer tests performed in variably saturated fissured chalk rocks presented very contrasting results in terms of transit times, according to artificially controlled water recharge conditions prevailing during the experiments. Under intense recharge conditions, tracers migrated across the partially or fully saturated fissure network, at high velocity in accordance with the high hydraulic conductivity and low effective porosity (fracture porosity). At the same time, a portion of the tracer was temporarily retarded in the almost immobile water located in the matrix. Under natural infiltration conditions, the fissure network remained inactive. Tracers migrated downward through the matrix, at low velocity in relation with the low hydraulic conductivity and the large porosity of the matrix. Based on these observations, Brouyere et al. (2004a) [Brouyere, S., Dassargues, A., Hallet, V, 2004a. Migration of contaminants through the unsaturated zone overlying the Hesbaye chalky aquifer in Belgium: a field investigation, J. Contain. Hydrol., 72 (1-4), 135-164, doi: 10.1016/j.conhyd.2003.10. 009] proposed a conceptual model in order to explain the migration of solutes in variably saturated, dual-porosity, dual-permeability chalk. Here, mathematical and numerical modelling of tracer and contaminant migration in variably saturated fissured chalk is presented, considering the aforementioned conceptual model. A new mathematical formulation is proposed to represent the unsaturated properties of the fissured chalk in a more dynamic and appropriate way. At the same time, the rock water content is partitioned between mobile and immobile water phases, as a function of the water saturation of the chalk rock. The groundwater flow and contaminant transport in the variably saturated chalk is solved using the control volume finite element method. Modelling the field tracer experiments performed in the variably saturated chalk shows the adequacy and usefulness of the new conceptual, mathematical and numerical model. (c) 2005 Elsevier B.V. All rights reserved. [less ▲]

Detailed reference viewed: 59 (14 ULg)
Full Text
Peer Reviewed
See detailA framework for an optimised groundwater monitoring network and aggregated indicators
Rentier, Céline; Delloye, Francis; Brouyère, Serge ULg et al

in Environmental Geology (2006), 50(2), 194-201

The implementation of the Water Framework Directive (EU 2000) requires a groundwater quality monitoring. It is used for characterisation of the 'good' chemical status of each groundwater body and for the ... [more ▼]

The implementation of the Water Framework Directive (EU 2000) requires a groundwater quality monitoring. It is used for characterisation of the 'good' chemical status of each groundwater body and for the restoration or protection purposes of those bodies already at 'good' status. Interpretative aspects are lying in the design of monitoring network and in the way of building global indicators. Attention is given here to the global chemical status of the groundwater bodies and to the role of diffuse pollution, much of which is brought via groundwater to surface water. Monitoring 'local' pollution associated with individual sites is not addressed. Groundwater bodies with different contrasted hydrogeology conditions, land use and topography have been considered to establish an approach for choosing an optimised monitoring network. Then, a quality assessment system has been developed and applied for qualifying the general status of each groundwater body. The use of non-dimensional indexes allows us to process with all kinds of chemical parameters in a normalised way and, by means of adequate aggregation rules, to qualify the general quality status of a groundwater body. The obtained diagnostic, even if not fully validated, is closely linked to the pragmatic objectives contained in the EU Water Directive. [less ▲]

Detailed reference viewed: 93 (24 ULg)
Full Text
See detailLarge-scale groundwater flow and transport modelling : Methodology and application to the Geer basin, Belgium
Orban, Philippe ULg; Dassargues, Alain ULg; Brouyère, Serge ULg

in Stauffer, Fr.; Dassargues, Alain (Eds.) Quantitative Geology from Multiple Sources: S10 Use of multiple sources in conditioning/calibrating groundwater flow and transport models (2006)

Efficient and sustainable management of water resources should be considered from an integrated way, at the basin scale. For that purpose, physically-based, spatially distributed modelling tools has ... [more ▼]

Efficient and sustainable management of water resources should be considered from an integrated way, at the basin scale. For that purpose, physically-based, spatially distributed modelling tools has turned to be very useful. If regional groundwater flow model have been developed for years now, large scale contaminant transport models are still almost inexistent. The objective of this extended abstract is to present briefly new concepts for large transport modelling, more particularly a modelling approach, the Hybrid Finite Element Mixing Cell (HFEMC) developed by the Hydrogeology Group of the University of Liège and implemented in the 3D simulator SUFT3D. First steps for the application to the Geer basin are also presented. [less ▲]

Detailed reference viewed: 32 (14 ULg)
Full Text
See detailIdentification of groundwater quality trends in a chalky aquifer threatened by intensive agriculture
Batlle-Aguilar, Jordi; Orban, Philippe ULg; Dassargues, Alain ULg et al

in Stauffer, Fr.; Dassargues, Alain (Eds.) Quantitative Geology from Multiple Sources: S10 Use of multiple sources in conditioning/calibrating groundwater flow and transport models (2006)

Diffuse groundwater contamination related to agricultural practices is a worldwide environmental problem, particularly the continuous increase in nitrate concentrations. As a response to this threat, the ... [more ▼]

Diffuse groundwater contamination related to agricultural practices is a worldwide environmental problem, particularly the continuous increase in nitrate concentrations. As a response to this threat, the European Union has adopted directives requiring that Member States take measures to reduce agricultural nitrate sources and stating that a “good” status of groundwater is required for all EU members. In order to achieve the environmental objectives for groundwater, the identification and reversal of any significant upward trend in the pollutant concentrations are required. Conclusions are drawn about the evolution of groundwater contamination by nitrates in the following decades with respect to the EU Water directive prescriptions. Measures have to be urgently taken in order to avoid major degradation of groundwater in 10 to 70 years. However, a good groundwater quality status cannot be expected for the 2015 EU Water Framework Directive (WFD). [less ▲]

Detailed reference viewed: 51 (16 ULg)
Full Text
See detailConceptual model of hydrogeological information for a GIS-based decision support system of artificial recharge in semi-arid regions
Wojda, Piotr; Gogu, Constantin Radu; Brouyère, Serge ULg

in Cox, S.; Laxton, J. (Eds.) Quantitative Geology from multiple sources: Delivering geoscience information through open web standards (2006)

Detailed reference viewed: 19 (1 ULg)
Full Text
See detailStress factors and associated physically based criteria and conclusions on the directions to be followed for developing a physically based vulnerability assessment method
Gardin, Nicolas; Wojda, Piotr; Brouyère, Serge ULg

Report (2005)

The specific results and outcomes of this deliverable is the proposition of a methodological framework for groundwater vulnerability assessment to any kind of stress factors, from a physically-based point ... [more ▼]

The specific results and outcomes of this deliverable is the proposition of a methodological framework for groundwater vulnerability assessment to any kind of stress factors, from a physically-based point of view. This methodology is in addition compatible with the well-known EU DPSIR framework for analysis from a physical and socio-economical perspective, environmental problems. From a more generic perspective, this deliverable provides a very convenient and rigorous framework for integrating the various research components developed within the project, into a decision support system, integrating environmental problems, data, processes and models, and socio-economical aspects. [less ▲]

Detailed reference viewed: 8 (6 ULg)
Full Text
See detailReport with documentation of reconstructed land use around test sites
Broers, H.P.; Visser, A.; Dubus, I.G. et al

Report (2005)

The establishment of tools for trends analysis in groundwater is essential for the prediction and evaluation of measures taken within context of the Water Framework Directive and the draft Groundwater ... [more ▼]

The establishment of tools for trends analysis in groundwater is essential for the prediction and evaluation of measures taken within context of the Water Framework Directive and the draft Groundwater Directive. This report describes the historic development of contaminant inputs into the groundwater system for the TREND 2 subcatchments. The historic input data are essential to interprete and understand time trends in groundwater, which is the focus of coming deliverables. The emphasis is on diffuse contaminants and includes figures of 1950-present nitrogen inputs fot the Wallonian and Dutch Meuse catchments and the German Schleswig-Holstein catchments. For the Dutch Meuse basin also historical inputs of P, K, S, Ca, Mg, Na, Zn and Cd were estimated. Inputs of the pesticide atrazine were estimated for the small French Brévilles catchment, using interviews with farmers. On a regional scale, all of these cases show increasing inputs up to about 1985 and a decrease afterwards due to regulations from that time on. Trends in inputs of other diffuse pollutants (cations, heavy metals, pesticides) seem to be correlated to the well established nitrogen inputs. The effects of this increase and subsequent decrease on concentrations in the groundwater system will be analysed in further work within TREND2. [less ▲]

Detailed reference viewed: 16 (0 ULg)
Full Text
See detailDocumentation of site equipment and description of experiments performed and still planned in the Flémalle former cokery test site
Batlle-Aguilar, Jordi; Brouyère, Serge ULg

Report (2005)

This deliverable provide a description of hydrogeological equipment available, hydrogeological tests and monitoring carried out up to now or planned for the next months to better understand hydrodynamic ... [more ▼]

This deliverable provide a description of hydrogeological equipment available, hydrogeological tests and monitoring carried out up to now or planned for the next months to better understand hydrodynamic conditions pollutant transfer mechanisms in the gravel alluvial aquifer of the river Meuse and to assess groundwater– surface water interactions in the Flémalle former cokery test site. The monitoring campaign and the experiments are performed using existing and recently drilled piezometers in the site. Up to now, continuous groundwater level monitoring, Meuse river water level monitoring, pumping tests and tracer tests have been carried out. They have already confirmed that the gravel aquifer is drained by the Meuse river. [less ▲]

Detailed reference viewed: 16 (2 ULg)
Full Text
See detailCompilation of data collected and fed into a hydrogeological database in the Walloon Meuse catchment region
Batlle-Aguilar, Jordi; Wojda, Piotr; Brouyère, Serge ULg

Report (2005)

The objectives of this deliverable are to provide a general description of a hydrogeological database developed by HGULg, including specific adaptations made to meet the AQUATERRA project’s needs and to ... [more ▼]

The objectives of this deliverable are to provide a general description of a hydrogeological database developed by HGULg, including specific adaptations made to meet the AQUATERRA project’s needs and to provide a synthesis of available datasets for the selected test sites in the Meuse basin. First, a general description of the Walloon Meuse basin and the selected AQUATERRA test sites is provided. Then, the general concepts, the conceptual model and the developed interfaces of the HGULg hydrogeological database are presented. Finally, a summary of datasets available for the selected test sites is provided. [less ▲]

Detailed reference viewed: 2 (1 ULg)
Full Text
See detailChapter in BASIN report on structured research results for further interpretation in terms of management tools/approaches for river basin management (INTEGRATOR), and in terms of EU policy impacts (EUPOL), delivered to the steering committee and Overview of analysis results for the Dommel catchment system
Joziasse, Jan; Vink, J.; Brouyère, Serge ULg

Report (2005)

An overview is presented of the research activities conducted by several AquaTerra work packages (BASIN, TREND, FLUX, BIOGEOCHEM) in the Meuse basin, with the emphasis on two specific sites: the Walloon ... [more ▼]

An overview is presented of the research activities conducted by several AquaTerra work packages (BASIN, TREND, FLUX, BIOGEOCHEM) in the Meuse basin, with the emphasis on two specific sites: the Walloon region and the Dommel catchment. The preliminary results and the relevance for management issues are presented. Furthermore, the progress in the formation of a stakeholder group and the organisation of a workshop with these stakeholders is reported. [less ▲]

Detailed reference viewed: 13 (0 ULg)
Full Text
See detailCompilation of data collected and fed into a hydrogeological database in the Walloon Meuse catchment region
Batlle-Aguilar, Jordi; Wojda, Piotr; Brouyère, Serge ULg

Report (2005)

Based on a first inventory of available case studies, test sites have been selected in the Walloon part of the Meuse Basin in Belgium. These sites meet the requirements and objectives of the researches ... [more ▼]

Based on a first inventory of available case studies, test sites have been selected in the Walloon part of the Meuse Basin in Belgium. These sites meet the requirements and objectives of the researches performed by different partners in AquaTerra. Available information and datasets have been collected for these sites and complementary investigations and experiments have been organized. Existing data and recently collected data have been compiled into a hydrogeological database developed by HGULg for the Walloon region and adapted to the specificities and needs of the AquaTerra project. The deliverable provides a general description of the hydrogeological database developed by HGULg: the conceptual model, specific adaptations performed for the AquaTerra project and interfaces for encoding, querying and exporting hydrogeological information stored in the database. A synthesis of datasets available in the HGULg Hydrogeological Database for the selected test sites in the Meuse basin is also provided. [less ▲]

Detailed reference viewed: 18 (1 ULg)
Full Text
Peer Reviewed
See detailInfluence of injection conditions on field tracer experiments
Brouyère, Serge ULg; Carabin, Guy; Dassargues, Alain ULg

in Ground Water (2005), 43(3), 389-400

Calibration of ground water transport models is often performed using results of field tracer experiments. However, little attention is usually paid to the influence, on resulting breakthrough curves, of ... [more ▼]

Calibration of ground water transport models is often performed using results of field tracer experiments. However, little attention is usually paid to the influence, on resulting breakthrough curves, of injection conditions and well-aquifer interactions, more particularly of the influence of the possible trapping of the tracer in the injection wellbore. Recently, a new mathematical and numerical approach has been developed to model injection conditions and well-aquifer interactions in a very accurate way. Using an analytical solution derived from this model, a detailed analysis is made of the evolution of the tracer input function in the aquifer. By varying injection conditions from one simulation to another, synthetic breakthrough curves are generated with the SUFT3D ground water flow and transport finite-element simulator. These tests show clearly that the shape of the breakthrough curves can be dramatically affected by injection conditions. Using generated breakthrough curves as "actual" field results, a calibration of hydrodispersive parameters is performed, neglecting the influence of injection conditions. This shows that neglecting the influence of actual injection conditions can lead to (1) errors on fitted parameters and (2) misleading identification of the active transport processes. Conclusions and guidelines are drawn in terms of proposed methodologies for better controlling the tracer injection in the field, in order to minimize risk of misinterpretation of results. [less ▲]

Detailed reference viewed: 38 (12 ULg)
Full Text
See detailIntegrated modelling of the hydrological cycle in relation to global climate change
Deliège, Jean-François ULg; Bourouag, Mohamed ULg; Dzisiak, J. P. et al

Report (2005)

The main objectives of the project “INTEGRATED MODELLING OF THE HYDROLOGICAL CYCLE IN RELATION TO GLOBAL CLIMATE CHANGE” (CG/DD/08), are : - to gain knowledge in the understanding of the hydrological ... [more ▼]

The main objectives of the project “INTEGRATED MODELLING OF THE HYDROLOGICAL CYCLE IN RELATION TO GLOBAL CLIMATE CHANGE” (CG/DD/08), are : - to gain knowledge in the understanding of the hydrological system at different time and space scales; - to develop and test an integrated holistic approach that can be able to assess the effects of climate change on the terrestrial hydrologic cycle and on water resources systems. The project is focused on two main aspects : 1) The comparison of models : 3 different types of models are used and compared : - the IRM/KMI uses a spatially non-discretized model (the IRMB model) and develops a spatially semi-discretized model (the SCHEME model); - the ILWM-KUL uses an existing spatially discretized integrated model, the MIKE-SHE model; - the HA-FUSAG, HG-KUL, LGIH-ULG and CE-ULG teams develop and use a spatially-discretized integrated model, composed of existing sub-models of land surface (soils), groundwater and surface water (the MOHISE model). These models have been tested and compared using the same data set, to assess their capabilities to represent the different phases of the terrestrial hydrological cycle (soil, groundwater, surface water). 2) The simulation of the impacts of climate changes on the terrestrial hydrological cycle : climate change scenarios (monthly changes of meteorological variables) were elaborated on the basis of the results of three GCM (Global Climate Models) experiments provided by the IPCC (International Panel on Climate Change) and tested on the test-basins. During the 4 years-project period (1997-2000), the scientific work has been devoted to the construction, integration and implementation of the models and related data bases. The models were tested, calibrated and validated on a few representative Belgian basins. The selected test-basins are the Gette basin (at Budingen : 600 km²), the Geer basin (at Kanne : 465 km²) and the Ourthe Orientale basin (at Mabompré : 319 km²). The results of this research demonstrate the ability of the models to simulate the functioning of the terrestrial hydrological cycle under the present climate and to take into account the major processes that occur in the soils, groundwater and surface water compartments. The models have been used to assess the effects of potential climate changes on the terrestrial hydrological cycle. [less ▲]

Detailed reference viewed: 14 (4 ULg)
Full Text
Peer Reviewed
See detailLarge-scale groundwater flow and transport modeling: Methodology and application to the Meuse Basin – Belgium
Orban, Philippe ULg; Brouyère, Serge ULg; Corbeanu, Horatiu et al

in Bringing Groundwater Quality Research to the Watershed Scale - Proceedings of GQ2004 (2005)

To meet the requirements of the EU Water Framework Directive, an integrated water management project named PIRENE was initiated by the Walloon Region of Belgium. A partner of this project, the ... [more ▼]

To meet the requirements of the EU Water Framework Directive, an integrated water management project named PIRENE was initiated by the Walloon Region of Belgium. A partner of this project, the Hydrogeology Group of the University of Liège, is in charge of the development of a physically based transient groundwater flow and transport model for the Walloon part of the Meuse Basin (approximately 17 000 km2). To face the problems associated with this large-scale model, a general approach has been developed that combines a hydrogeological database and GIS systems to manage data. Techniques of spatial discretization have been applied that optimize the number of unknowns. For modelling groundwater flow and transport on a large scale, a new numerical approach called the Hybrid Finite Element Mixing Cell (HFEMC) has been implemented in the 3-D simulator SUFT3D. [less ▲]

Detailed reference viewed: 52 (12 ULg)