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See detailCarte hydrogéologique de Wallonie, Tavier - Esneux 49/1-2, 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 : mai 2004 (2004)

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See detailCarte hydrogéologique de Wallonie, Natoye - Ciney 54/1-2, 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 : mai 2004 (2004)

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See detailCarte hydrogéologique de Wallonie, Natoye - Ciney 54/1-2
Ruthy, Ingrid ULg; Dassargues, Alain ULg

Cartographic material (2004)

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See detailCarte hydrogéologique de Wallonie, Tavier - Esneux 49/1-2
Ruthy, Ingrid ULg; Dassargues, Alain ULg

Cartographic material (2004)

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See detailClimate change impacts on groundwater resources: modelled deficits in a chalky aquifer, Geer basin, Belgium
Brouyère, Serge ULg; Carabin, Guy; Dassargues, Alain ULg

in Hydrogeology Journal (2004), 12(2), 123-134

An integrated hydrological model (MOHISE) was developed in order to study the impact of climate change on the hydrological cycle in representative water basins in Belgium. This model considers most ... [more ▼]

An integrated hydrological model (MOHISE) was developed in order to study the impact of climate change on the hydrological cycle in representative water basins in Belgium. This model considers most hydrological processes in a physically consistent way, more particularly groundwater flows which are modelled using a spatially distributed, finite-element approach. Thanks to this accurate numerical tool, after detailed calibration and validation, quantitative interpretations can be drawn from the groundwater model results. Considering IPCC climate change scenarios, the integrated approach was applied to evaluate the impact of climate change on the water cycle in the Geer basin in Belgium. The groundwater model is described in detail, and results are discussed in terms of climate change impact on the evolution of groundwater levels and groundwater reserves. From the modelling application on the Geer basin, it appears that, on a pluriannual basis, most tested scenarios predict a decrease in groundwater levels and reserves in relation to variations in climatic conditions. However, for this aquifer, the tested scenarios show no enhancement of the seasonal changes in groundwater levels. [less ▲]

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See detailModélisation des impacts des changements climatiques sur les ressources en eaux souterraines
Dassargues, Alain ULg

Scientific conference (2004, March 17)

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See detailModélisation des impacts des changements climatiques sur les ressources en eaux souterraines
Dassargues, Alain ULg

Scientific conference (2004, March 15)

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See detailDrying up of a natural spring for ensuring stability of an artificial slope: is it sustainable development ?
Dachy, Marie; Sage, Sandrine; Dassargues, Alain ULg

in Hack, R.; Azzam, R.; Charlier, Robert (Eds.) Engineering geology for infrastructure planning in Europe (2004)

Near a small city of the Belgian ‘Ardennes’ (East of Belgium), modification of a natural slope for extension of industrial activities has required an extensive drainage in a weathered zone composed of ... [more ▼]

Near a small city of the Belgian ‘Ardennes’ (East of Belgium), modification of a natural slope for extension of industrial activities has required an extensive drainage in a weathered zone composed of colluvium and weathered claystones and quartzites. After a few days, the drain at the foot of the artificial slope was producing about 1000 m3/day while a natural spring located at a 200 m distance on the hillside was completely dried up. This spring was used for drinking water by the local community. A shallow geophysical prospection by refraction seismics and 2D geoelectrical tomography, associated to geological, morphostructural and hydrogeological observations have lead to a clear understanding of (1) the spring occurrence; (2) the feeding conditions of the spring and consequently (3) the ‘lateral’ hydraulic impact of the drain. In the hill, the bedrock is changing from quartzites (uphill) to claystones (downhill) inducing changes in hydraulic conductivity and thickness of the overlying weathered zone. On the basis of these hydrogeological conditions, associated to the specific topographic conditions, different possible remediation schemas have been proposed to the decision makers. Unfortunately, the full restoration of the natural spring appears to be one of the most technically and financially difficult option …while it is surely the most suitable in the name of a sustainable development. [less ▲]

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See detailCarte hydrogéologique de Wallonie, Habay-la-Neuve - Arlon 68/7-8
Ruthy, Ingrid ULg; Dassargues, Alain ULg; Monjoie, Albéric

Cartographic material (2004)

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See detailCarte hydrogéologique de Wallonie, Habay-la-Neuve - Arlon 68/7-8, 1/25.000 : [notice explicative]
Ruthy, Ingrid ULg; Dassargues, Alain ULg; Monjoie, Albéric

Book published by Service Public de Wallonie, DGARNE - Version provisoire : mai 2004 (2004)

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See detailQuantitative and qualitative hydrogeological study of the alluvial aquifer of Somes-Szamos (RO-HU) NATO SfP Project 973684 SQUASH
Dassargues, Alain ULg; Lenart, Laszlo; Drobot, Radu

in Hidrotehnica (2004), 49(9-10), 3-7

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See detailRegional model of the Somes-Szamos aquifer (RO-HU)
Drobot, Radu; Jianu, Marilena; Sirbu, Nicolai et al

in Hidrotehnica (2004), 49(9-10), 58-66

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See detailRéseaux de surveillance des masses d’eau souterraine en Région Wallonne
Rentier, Céline; Delloye, Francis; Dassargues, Alain ULg

in Tribune de l'Eau (La) (2004), (631-632), 11-21

La mise en œuvre de la directive européenne cadre de l’eau nécessite l’élaboration, par masse d’eau souterraine, d’un réseau de mesure et de surveillance aussi représentatif que possible de l’état des ... [more ▼]

La mise en œuvre de la directive européenne cadre de l’eau nécessite l’élaboration, par masse d’eau souterraine, d’un réseau de mesure et de surveillance aussi représentatif que possible de l’état des eaux souterraines. En Région Wallonne, cinq masses d’eau de caractéristiques différentes d’un point de vue géologique, hydrogéologique et d’occupation du sol ont fait l’objet d’une étude en vue d’établir une stratégie de sélection des sites de mesures. La sélection des stations de mesure composant chaque réseau a été réalisé en tenant compte de divers critères tels que la géologie, l’hydrogéologie et l’hydrochimie de la masse d’eau, les caractéristiques des points d’eau existants, mais aussi la densité et la répartition spatiale des ouvrages sélectionnés. Le système d’évaluation de la qualité des eaux souterraines SEQESO adopté en Région Wallonne a été appliqué à chacun de ces réseaux afin d’apprécier l’état chimique de ces masses d’eaux conformément à la directive-cadre. The implementation of the European water framework directive requires the construction of monitoring networks being as far as possible representative of the global water quality in each groundwater body. In Walloon Region, five groundwater bodies with different contrasted geological conditions, hydrogeological conditions and soil occupancy, were studied in order to establish an approach for choosing an adequate network of monitoring points. This selection was realized by considering different criterions as the groundwater geology, hydrogeology and hydrochemistry, the feature of existing waterpoints, but also the density and the spatial distribution of the selected points in order to obtain a statistically representative network. The quality assessment system for groundwater (SEQESO) adopted by the Walloon Region has been applied to the five monitoring networks in order to fully appreciate the chemical status of the groundwater bodies in accordance with the European directive. [less ▲]

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See detailAggregated indicators from an optimized groundwater monitoring network: example in Walloon region of Belgium for implementation of the European Water Directive
Rentier, Céline; Delloye, Francis; Brouyère, Serge ULg et al

in Proc. of Integrated methods for assessing water quality, COST629 Workshop (2004)

Following prescriptions of the recent European Water Framework Directive, a groundwater quality evaluation system must be adopted for checking the groundwater status with respect to different contaminants ... [more ▼]

Following prescriptions of the recent European Water Framework Directive, a groundwater quality evaluation system must be adopted for checking the groundwater status with respect to different contaminants. A screening evaluation system (based on a system developed by the French Water Agencies) has been adapted to the specific conditions in the Walloon Region of Belgium. Groundwater quality data are aggregated into indicators with respect to different water uses such as drinking water standards, thresholds values for preserving dependent surface ecosystems, or the groundwater ‘natural or patrimonial state’. A global groundwater quality indicator can also be calculated. Different aggregation techniques are discussed with their respective influence on the final indicator. In relation to this evaluation, the monitoring network must be adapted for being (as far as possible) representative of the global quality of water in each groundwater body. Existing knowledge and understanding of the actual hydrogeological conditions were used in priority for choosing an adequate network of monitoring points. At the same time, the spatial density of points was checked in order to obtain a statistically representative network. Applications were performed in five different GWBodies belonging to the hydrographic district of the Meuse River in the Walloon Region and with different contrasted geological conditions: Cretaceous chalks, Carboniferous limestones and Pleistocene gravels of the alluvial plain of the River Meuse. These examples provide a good opportunity for further discussion and work about the main related issues: optimzation procedures, aggregation methods and estimation of the reliability of indicators. [less ▲]

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