References of "Dassargues, Alain"
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See detailCarte hydrogéologique de Wallonie, Hotton - Dochamps 55/5-6
Ruthy, Ingrid ULg; Dassargues, Alain ULg

Cartographic material (2006)

Detailed reference viewed: 187 (2 ULg)
See detailCarte hydrogéologique, Hotton - Dochamps 55/5-6, 1/25.000 : [notice explicative]
Ruthy, Ingrid ULg; Dassargues, Alain ULg

Book published by Ministère de la Région wallonne, Direction générale des ressources naturelles et de l'environnement - Edition provisoire : septembre 2006 (2006)

Detailed reference viewed: 25 (4 ULg)
See detailCarte hydrogéologique, Aye - Marche-en-Famenne 54/7-8, 1/25.000 : [notice explicative]
Ruthy, Ingrid ULg; Dassargues, Alain ULg

Book published by Ministère de la Région wallonne, Direction générale des ressources naturelles et de l'environnement - Edition provisoire : juillet 2006 (2006)

Detailed reference viewed: 30 (3 ULg)
See detailCarte hydrogéologique de Wallonie, Maffe - Grandhan 54/3-4, 1/25.000 : [notice explicative]
Ruthy, Ingrid ULg; Dassargues, Alain ULg

Book published by Ministère de la Région wallonne, Direction générale des ressources naturelles et de l'environnement - Edition provisoire : juillet 2006 (2006)

Detailed reference viewed: 11 (2 ULg)
See detailCarte hydrogéologique de Wallonie, Maffe - Grandhan 54/3-4
Ruthy, Ingrid ULg; Dassargues, Alain ULg

Cartographic material (2006)

Detailed reference viewed: 39 (2 ULg)
See detailCarte hydrogéologique de Wallonie, Aye - Marche-en-Famenne 54/7-8
Ruthy, Ingrid ULg; Dassargues, Alain ULg

Cartographic material (2006)

Detailed reference viewed: 45 (2 ULg)
See detailCarte hydrogéologique de Wallonie, Alleur - Liège 42/1-2
Ruthy, Ingrid ULg; Dassargues, Alain ULg

Cartographic material (2006)

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See detailSimulations MOHICAN pour la statistique des débits maxima (projet STATHY) : bassins de la Warchenne, la Wamme et la Gueule
Deliège, Jean-François ULg; Bourouag, Mohamed ULg; Smitz, Joseph ULg et al

Report (2006)

Le modèle MOHICAN (« Modèle hydrologique intégré pour le calcul des crues et l’amplitude des niveaux d’eau ») a été développé conjointement par l’Université de Liège (Laboratoire d’hydrodynamique ... [more ▼]

Le modèle MOHICAN (« Modèle hydrologique intégré pour le calcul des crues et l’amplitude des niveaux d’eau ») a été développé conjointement par l’Université de Liège (Laboratoire d’hydrodynamique appliquée, Laboratoire de Géologie de l’Ingénieur et d’Hydrogéologie, Centre d’Etude et de Modélisation de l’environnement) et la Faculté Universitaire des Sciences Agronomiques de Gembloux (Unité d’Hydraulique agricole) pour le compte et avec le support du Ministère de l’Equipement et des Transports, Service d’Etudes Hydrologiques (MET/SETHY) de la Région wallonne. Dans le cadre du projet STATHY visant à établir la cartographie des zones d’inondation en région Wallonne, il était nécessaire de disposer de séries étendues de débits horaires pour chaque sous-bassin versant. Le modèle MOHICAN a été utilisé à la demande du SETHY pour générer ces données sur 14 années (1991 à 2004) pour 3 sous-bassins pour lesquels la Région Wallonne ne disposait pas de données horaires suffisantes : • La Warchenne à Malmédy (+/- 29 km²), • La Wamme à Hargimont (+/- 81 km²), • La Gueule à Sippenaeken (+/- 120 km²). [less ▲]

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See detailCarte hydrogéologique de Alleur - Liège 42/1-2, 1/25.000 : [notice explicative]
Ruthy, Ingrid ULg; Dassargues, Alain ULg

Book published by Ministère de la Région wallonne, DGRNE - Première édition: 2002 - Actualisation partielle : mai 2006 (2006)

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See detailCaractérisation des nappes aquifères: une nécessité pour leur protection et leur gestion
Dassargues, Alain ULg

Scientific conference (2006, February 23)

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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 ▲]

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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. (Ed.) 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 ▲]

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See detailGeo-electrical data fusion by stochastic co-conditioning simulations for delineating groundwater protection zones
Dassargues, Alain ULg

in CMWR XVI - Computational Methods in Water Resources (2006)

In hydrogeology, advances in the delimitation of protection zones are made by the use of stochastic simulations integrating all available data. In practice, due to the few available measurements of the ... [more ▼]

In hydrogeology, advances in the delimitation of protection zones are made by the use of stochastic simulations integrating all available data. In practice, due to the few available measurements of the main parameters (hard data), it is very useful to integrate several secondary properties of the media as indirect data (soft data) to reduce the uncertainty of the results. In aquifers, most of the solute spreading is governed by the hydraulic conductivity (K) spatial variability, which is generally considered as the main uncertain parameter. A stochastic approach integrating hydraulic conductivity measurements (hard data), head observations and shallow electrical resistivity tomography (soft data) is presented. Results are discussed on a synthetic and on a practical case. It is shown in practice how the uncertainty of the well capture zone probability distribution (CaPD) can be reduced. Since geophysical data and head observations are easier to collect on the field then hydraulic conductivity measurements, they are generally more abundant. The methodology presented can even be used in real applications when little or no information is available about the hydraulic properties, through the conditioning on geophysical data and/or head observations. [less ▲]

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Peer Reviewed
See detailEffect of excavation induced fractures on radionuclide migration through the Boom Clay (Belgium)
Huysmans, Marijke; Berckmans, Arne; Dassargues, Alain ULg

in Applied Clay Science (2006), 33(3-4), 207-218

In Belgium, the Boom Clay is being evaluated as a potential host formation for the disposal of high-level nuclear waste. In order to investigate this option, an underground research facility composed of ... [more ▼]

In Belgium, the Boom Clay is being evaluated as a potential host formation for the disposal of high-level nuclear waste. In order to investigate this option, an underground research facility composed of two access shafts and 200m of galleries was excavated. Excavation induced fractures were observed in a zone of approximately 1 m around the galleries. In this study, the potential effect of these fractures on radionuclide migration in the Boom Clay is investigated. Therefore, a hydrogeological model of the clay is built with a radionuclide source in the middle of the clay layer surrounded by different fracture configurations. Two types of fracture configurations are inserted in the model. The first type of fracture properties is drawn stochastically from the probability distributions of the properties of the fractures observed around previously excavated galleries. These fracture patterns are considered to be realistic although in this study it is conservatively assumed that no self-sealing occurs. The model is run for a large number of stochastically drawn fracture configurations and the results are compared to a model without fractures. These calculations show that the radionuclide fluxes through the clay are not significantly influenced by these fractures. For the second type of fracture configurations, the fracture properties are varied over a much larger range. Hypothetical fractures with much higher values of fracture extent, aperture, dip and frequency than observed are modeled, With these hypothetical fracture configurations, the critical values of the fracture parameters are determined that must be exceeded to have a significant effect on the radionuclide fluxes through the clay. These calculations show that the extent of the fractured zone has the largest effect on radionuclide migration. The other fracture parameters (aperture, spacing and dip) have a limited effect on the radionuclide fluxes. To obtain a total radionuclide flux through the lower clay boundary that is respectively 10%, 50% and 100% larger than without a fractured zone, the extent of the hypothetical fractured zone should be respectively 27.97 m, 43.86 m and 46.92 m. Such fractures are not expected to be generated by mechanical excavation in the Boom Clay. The obtained critical extent values of the hypothetical fractures are a factor 30 to 40 higher than the measured values of the extent of the excavation disturbed zone. These calculations thus indicate that it is very unlikely that the extent of the fractured zone around the galleries will be large enough to have a significant effect on the radionuclide fluxes through the Boom Clay. This conclusion is further supported by the conservative assumption that no self-sealing occurs. These calculations can function as a preliminary robustness test in ongoing safety analysis studies. (c) 2006 Elsevier B.V. All rights reserved. [less ▲]

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