References of "Brouyère, Serge"
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See detailDL 45 : Application and validation of the general methodology and concept of groundwater vulnerability assessment at regional scale on the Israeli coastal aquifer
Beaujean, Jean ULg; Lemieux, Jean-Michel; Brouyère, Serge ULg

Report (2008)

This deliverable consists in applying the concepts and methodologies developed in Deliverable D43 and D44 to synthetic and real case studies. Our researches have focused on the generalized groundwater ... [more ▼]

This deliverable consists in applying the concepts and methodologies developed in Deliverable D43 and D44 to synthetic and real case studies. Our researches have focused on the generalized groundwater vulnerability assessment methodology, and more precisely on evaluating, under the framework of physically-based indicators, the groundwater sensitivity/vulnerability to stress factor considering artificial recharge as a potential response to the degradation of the groundwater resource. In the context, different approaches have been identified in the literature and implemented in appropriate modelling tools (i.e. HydroGeoSphere) for calculating the various sensitivity/vulnerability coefficients. These approaches are the influence coefficient method, the sensitivity equation method and the adjoint operator method. The two first methods show relevant results on both the considered synthetic case studies that relate groundwater vulnerability to (1) quantity issues and (2) to sea water intrusion. They illustrate the way of applying the methodology to “real case studies”.These first applications should be the object of more complex but strongly related case studies. [less ▲]

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See detailA new tracer technique for monitoring groundwater fluxes : the finite volume point dilution method
Brouyère, Serge ULg; Batlle-Aguilar, Jordi; Goderniaux, Pascal ULg et al

Conference (2008, June 06)

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See detailDevelopment of the Geer basin Hydrological model for climatic scenarios and first results about impacts evaluation
Goderniaux, Pascal ULg; Brouyère, Serge ULg; Orban, Philippe ULg et al

Report (2008)

A surface – subsurface flow numerical model of the Geer basin (465 km²) has been implemented to assess the possible impacts of climate change on the groundwater resources. This model is physically-based ... [more ▼]

A surface – subsurface flow numerical model of the Geer basin (465 km²) has been implemented to assess the possible impacts of climate change on the groundwater resources. This model is physically-based, spatially-distributed and it integrates totally the groundwater and surface water. Simulations were performed using 6 climate change scenarios generated by the University of Newcastle-Upon-Tyne. These scenarios simulate changes in the amplitude, but also in the frequency and persistence of some meteorological events. First results show that, according the implemented flow model and the used climatic scenarios, significant decreases are expected in the groundwater levels (up to 12 meters) and in the surface water flow rates (reduction between 16% and 32%) [less ▲]

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See detailGroundwater flow and transport model for the Flémalle cokery site
Batlle-Aguilar, Jordi; Brouyère, Serge ULg

Report (2008)

This deliverable describes the groundwater flow and transport model performed for the Flémalle test site. Calibration of the groundwater model has been done using both, zoning and pilot points approaches ... [more ▼]

This deliverable describes the groundwater flow and transport model performed for the Flémalle test site. Calibration of the groundwater model has been done using both, zoning and pilot points approaches, while model transport calibration has been performed using tracer tests carried out. Different scenarios of pollutant concentration and degradation constant rates have been simulated. Results point out that biodegradation is likely to occur, as evidenced by former studies within BGC in the scope of the AquaTerra project. [less ▲]

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See detailDL 44 : Methodology and setup of the adopted groundwater vulnerability assessment method
Beaujean, Jean ULg; Wojda, Piotr; Gardin, Nicolas et al

Report (2008)

The objectives of this deliverable DL44 are to finalize the description of the global groundwater vulnerability assessment methodology, in particular : (1) to propose an extension of the concept of ... [more ▼]

The objectives of this deliverable DL44 are to finalize the description of the global groundwater vulnerability assessment methodology, in particular : (1) to propose an extension of the concept of sensitivity coefficient to vulnerability coefficient by introducing a ratio (distance to damage ratio) that reflects the “distance” between the current state of degradation of the water resource system and the “damaged state”,(2) To describe the methodology proposed to combine, through aggregation of spatiallydistributed indicators and multi criteria analysis, the different vulnerability coefficientsinto a single indicator of groundwater vulnerability for decision making, (3) To go further into the analysis and discussion of several key theoretical “case studies” for illustrating the way to setup the full methodology, from the DPSIR analysis to the expression of sensitivity and vulnerability coefficients. [less ▲]

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See detailEtude de tendance dans les hauteurs piézométriques mesurées au piézomètre de Viemme
Orban, Philippe ULg; Batlle-Aguilar, Jordi; Brouyère, Serge ULg et al

Report (2008)

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See detailReport on the development of the Geer Hydrological model. Final results about climate change impacts evaluation.
Goderniaux, Pascal ULg; Brouyère, Serge ULg; Orban, Philippe ULg et al

Report (2008)

In the framework of Workpackage BASIN R3 Meuse, the Hydrology Group of the University of Liège (Belgium) has developed a hydrological model of the Geer sub-catchment, in order to assess climate change ... [more ▼]

In the framework of Workpackage BASIN R3 Meuse, the Hydrology Group of the University of Liège (Belgium) has developed a hydrological model of the Geer sub-catchment, in order to assess climate change impacts on groundwater reserves. The water resource Systems Research Laboratory of the Newcastle University has produced the climate change scenarios applied on the hydrological model. This report describes the methodology used, the implementation of the hydrological model, the climate change scenarios and the results of the study. [less ▲]

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See detailInterpretation of a tracer test at Brévilles after 2 years of monitoring
Goderniaux, Pascal ULg; Gutierrez, Alexis; Brouyère, Serge ULg

Report (2008)

To understand and predict the behaviour and transfer of diffuse contamination, a small catchment is intensively studied in the vicinity of Paris. A multi tracer test involving a new technique, the FVPDM ... [more ▼]

To understand and predict the behaviour and transfer of diffuse contamination, a small catchment is intensively studied in the vicinity of Paris. A multi tracer test involving a new technique, the FVPDM method (Finite Volume Point Dilution Method - Brouyère et al., 2008) has been performed in natural flow conditions. Injections of four different tracers (uranine, sulforhodamine B, lithium chloride and potassium iodide) took place in four piezometers involving different areas of the aquifer and different depth. This tracer test follows a former test briefly described. A particularly long monitoring (Nov-2005 to Feb-2008) demonstrates the existence of several transport velocities within the sandy layer, which seems linked to the decrease of hydraulic conductivity with depth. Absence of recovery of two tracers confirms the results of the former test and identifies spatial heterogeneities probably due to the geological structure. The new insight and parameter quantification brought by interpretation of these tests contributes to a better characterization of the saturated zone and shall be exploited through modelling for transport predictions of pesticides. [less ▲]

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See detailA New Tracer Technique for Monitoring Groundwater Fluxes: The Finite Volume Point Dilution Method
Brouyère, Serge ULg; Batlle-Aguilar, Jordi; Goderniaux, Pascal ULg et al

in Journal of Contaminant Hydrology (2008), 95(3-4), 121-40

Quantification of pollutant mass fluxes is essential for assessing the impact of contaminated sites on their surrounding environment, particularly on adjacent surface water bodies. In this context, it is ... [more ▼]

Quantification of pollutant mass fluxes is essential for assessing the impact of contaminated sites on their surrounding environment, particularly on adjacent surface water bodies. In this context, it is essential to quantify but also to be able to monitor the variations with time of Darcy fluxes in relation with changes in hydrogeological conditions and groundwater - surface water interactions. A new tracer technique is proposed that generalizes the single-well point dilution method to the case of finite volumes of tracer fluid and water flush. It is called the Finite Volume Point Dilution Method (FVPDM). It is based on an analytical solution derived from a mathematical model proposed recently to accurately model tracer injection into a well. Using a non-dimensional formulation of the analytical solution, a sensitivity analysis is performed on the concentration evolution in the injection well, according to tracer injection conditions and well-aquifer interactions. Based on this analysis, optimised field techniques and interpretation methods are proposed. The new tracer technique is easier to implement in the field than the classical point dilution method while it further allows monitoring temporal changes of the magnitude of estimated Darcy fluxes, which is not the case for the former technique. The new technique was applied to two experimental sites with contrasting objectives, geological and hydrogeological conditions, and field equipment facilities. In both cases, field tracer concentrations monitored in the injection wells were used to fit the calculated modelled concentrations by adjusting the apparent Darcy flux crossing the well screens. Modelling results are very satisfactory and indicate that the methodology is efficient and accurate, with a wide range of potential applications in different environments and experimental conditions, including the monitoring with time of changes in Darcy fluxes. [less ▲]

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See detailThe Hybrid Finite-Element Mixing-Cell method: a new flexible method for large scale groundwater modelling
Orban, Philippe ULg; Brouyère, Serge ULg; Wildemeersch, Samuel ULg et al

Conference (2008)

Interest of end-users and policy makers for understanding and managing water systems at the regional scale has increased for years. At this scale, groundwater models of different complexity ranging from ... [more ▼]

Interest of end-users and policy makers for understanding and managing water systems at the regional scale has increased for years. At this scale, groundwater models of different complexity ranging from black-box models to physically based distributed models have been used in various hydrogeological conditions. Black-box models, such as transfer functions, have been applied for example to model groundwater in large scale hydrological models, to model karstic systems, in particular for the interpretation of isotopic data. Their concepts are simple and attractive because they require relatively few data. The main drawbacks are however that modelling results are not spatially distributed and their predictive capability is questionable due to the semi-empirical nature of process descriptions. On the contrary, due to a more advanced description of ongoing processes, physically-based distributed models are expected to have better predictive capabilities than black-box models. However, because such models require more data, they are generally applied for case studies that are better characterized from a hydrogeological point of view, for which the distribution of water levels or solute concentrations in the groundwater systems are needed. For large-scale modelling purposes, black-box models and physically-based distributed models have both proved their utilities and have their own justifications, advantages and disadvantages. However, few attempts have been made to combine the advantages of these two categories of approaches in a unified modelling application. A new flexible modelling approach, the Hybrid Finite-Element Mixing-Cell method (HFEMC), has been developed that allows combining in a single model, and in a fully integrated way, different mathematical approaches of various complexities for groundwater modelling in complex and large scale environments. This method has been implemented in the groundwater flow and solute transport numerical code SUFT3D. The approach has been first tested and illustrated using basic and advanced “synthetic” examples that allow validating and discussing its advantages over existing modelling concepts. The HFEMC approach is now applied for the development of a large scale groundwater flow and solute transport model in different groundwater basins in Belgium. [less ▲]

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Peer Reviewed
See detailThe Hybrid Finite-Element Mixing-Cell method: a new flexible method for modelling mine water problems
Brouyère, Serge ULg; Orban, Philippe ULg; Wildemeersch, Samuel ULg et al

in Rapantova, N.; Hrkal, Z. (Eds.) Mine Water and the Environment Proceedings of IWMA 2008 (2008)

Mine closure is often accompanied by a stop in dewatering operations. This generally induces groundwater rebound in the mined rock system with short and long term consequences that may be disastrous: soil ... [more ▼]

Mine closure is often accompanied by a stop in dewatering operations. This generally induces groundwater rebound in the mined rock system with short and long term consequences that may be disastrous: soil instabilities such as landslides and subsidence reactivation, flooding, flooded basement and acid mine drainage. Modelling tools can be very advantageous and efficient in helping understanding and managing such problems, however, classical modelling approaches have proved to be relatively unsuited to such contexts. Because of the former mining operations, the underground geological system is strongly disturbed (excavated, fractured and collapsed zones, galleries, large shafts, etc.). Using complex spatially distributed modelling approaches such as 3D finite elements usually lead to strong difficulties related to the lack of data, the complexity of geological and hydrogeological conditions (complex geometry, non Darcian fluxes…). On the other hand, using a simplified approach such as black-box models often leads to oversimplification of the reality: particularly when interactions between the mined system and its surrounding geological and hydrogeological environment are very important. A new modelling approach is developed for simulation of the groundwater flow in such complex environments. It combines, in a single fully integrated simulator, a representation of the unmined area by a classical finite element modelling technique, together with conceptualisation of the worked areas and galleries by a group of mixing cells connected by pipes. The whole assembled groundwater flow model allows an accurate estimation and representation of (a) water infiltration (precipitations, river losses …) through the unsaturated zone reaching the exploited area (recharge of boxes) and (b) water exchanges with adjacent aquifers. The model can estimate the flow of groundwater in and around the minefield and the mean water level in the boxes. It is also capable of considering water exchanges between different mined zones, through connection pathways such as old roadways galleries and shafts. Modelling concepts and equations are described and illustrated using basic and advances validation examples. A real case application corresponding to an abandoned coalfield in the region of Liège (Belgium) is used to illustrate the suitability and efficiency of the approach. [less ▲]

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See detailGroundwater vulnerability assessment using physically based modelling: from challenges to pragmatic solutions
Popescu, Ileana Cristina; Gardin, Nicolas; Brouyère, Serge ULg et al

in Refsgaard, J. C.; Kovar, K.; Haarder, E. (Eds.) et al Calibration and Reliability in Groundwater Modelling: Credibility in Modelling (2008)

Numerous groundwater vulnerability and risk mapping techniques have been developed taking into consideration a variable number of factors. The most common techniques are based on calculation of an index ... [more ▼]

Numerous groundwater vulnerability and risk mapping techniques have been developed taking into consideration a variable number of factors. The most common techniques are based on calculation of an index expressing the protective effect of underground formations overlying the groundwater resource. The limitation of most of these methods is related to their use of a qualitative definition of groundwater vulnerability, as opposed to a definition based on a quantitative description of contaminant migration. A physically-based point of view and definition of the vulnerability is proposed and based on three factors describing a pollution event, which are the contaminant transfer time from the hazard location to the 'target', the contamination duration at the 'target' and the level of contaminant concentration reached at the 'target'. This concept allows a clear distinction between conventional aspects and physically-based results in the building of a final vulnerability indicator. This methodology has the further advantage to consider the possible impact of runoff conditions occurring at the land surface and possibly leading to lateral contamination of groundwater through downstream preferential infiltration features. Practically, this method needs to describe and simulate the pollutant migration in the unsaturated zone and possibly in the saturated zone in order to assess the breakthrough curve at the 'target'. Preliminary application is illustrated on a case-study located in a limestone basin in Belgium. Perspectives are proposed towards a generalisation of the vulnerability concept for risk assessment within a pressure - state - impact framework. [less ▲]

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See detailHydrogeological study of Somes-Szamos transboundary alluvial aquifer
Dassargues, Alain ULg; Drobot, Radu; Lenart, Laszlo et al

in Technical/Scientific Issues of Transboudary Water Management: Experience from around the world (2008)

Detailed reference viewed: 48 (17 ULg)