TRANSNATIONAL MODELING OF THE SURFACE WATER QUALITY OF THE INTERNATIONAL RIVER BASIN DISTRICT MEUSE WITH PEGASE

The PEGASE Model has been applied at the entire International River Basin District of the Meuse. The poster presents different sub-basin applications on (i) the Chiers (Luxembourg + Belgium Walloon Region and French Rhin-Meuse Basin, 2000-2006) for the reference years 2000 and 2002 and prospective scenario 2015, (ii) International simulation performed (during 2005-2006) upstream (up to the Belgian border) for the reference year 2002, (iii) Current coordination between BE-Flemish Region and NL for downstream simulations of historical situation and (iv) prospective scenarios : International databases for a single reference year on the whole Meuse Distric

Pegase modelling studies applied to micropollutants: use cases

For the last years, PEGASE model has been used in two studies aiming at better assessment of the source and behaviour of micropollutants in the rivers network. In the first study, with financial support from INERIS1, the PEGASE model has been used to simulate the fate of micropollutants (Cd, Zn & Cu) within the basins of the Meuse and the Adour. The choice of the modelled micropollutants and sub-basins has been performed in agreement with INERIS, the involved Water Agencies and the Aquapole. A major selection criterion was the availability of data (discharges and in-situ measurements). For the second study, the PEGASE model has been adapted to describe the cocaine fate (or rather one of its stable metabolite: benzoylecgonine–BZE) in surface water. The BZE has been added to the model as an additional micropollutant, thanks to the implementation of a new state variable. Simulations of BZE have been done in Belgium, where many measurements from the COWAT project [3] were available. The first results show a good matching between calculated and measured values. The ability of the model to simulate the fate of micropollutants (including emerging substances) within surface water has been demonstrated, but still requires enhancements and extension to other substances and sub-basins. In addition, these studies have shown the huge work remaining in discharge inventories

Le logiciel PegOpera : un outil pour la gestion intégrée des eaux de surface

Le logiciel PegOpera inclut la version 5 du modèle Pegase (Planification Et Gestion de l’ASsainissement des Eaux) et une nouvelle interface graphique. PegOpera est un outil personnalisé utilisé par les gestionnaires de l’eau et opérationnel dans les champs d’applications de la Gestion Intégrée des Ressources en Eau (assainissement, DCE, NQE, …)

Pegase, a model dedicated to Surface WAter Quality Assessment that helps stakeholders implementing the WFD

Pegase, a model dedicated to surface water quality assessment that helps stakeholders implementing the WFD. That presentation showed 2 different applications directly made by the stakeholders in charge of the water management at the basin scale. The end-users analysed results of the Pegase model in the scope of implementation of the WFD. Differents scenarios were build in order to simulate the way to reach the good status for water bodies. Associated costs were estimated and relevant decisions were oriented using the results of the numerical Pegase tool

Water Framework Directive and Modelling Using PEGOPERA Simulation Software

peer reviewedaudience: researcher, professional, studentThe Water Framework Directive 2000/60/EC (WFD) established a framework for community action in the field of water policy. To implement the WFD, the competent authorities for watershed management should use modelling techniques to establish, for example, the pressure/impacts relationship. The PEGOPERA modelling tool (composed of the water quality model PEGASE and a friendly Graphical User Interface), has been developed in order to be compliant with the requirements of the WFD. PEGASE is a physicochemical model describing the behaviour of whole river systems, at various scales, from tens to tens of thousands km². The specificity of the model is its ability to work at a high spatial resolution not only for small river basins (water body level), but also for large drainage networks. Already used by several basin management competent authorities, the PEGOPERA modelling tool proved to be an efficient tool for helping in surface water management from local up to the international district level and is therefore an operational numerical tool for WFD implementatio

PEGASE: UN MODÈLE INTÉGRÉ BASSIN HYDROGRAPHIQUE/ RIVIÈRES: PREMIÈRE APPLICATION TEST À LA COCAÏNE.

Le modèle PEGASE (Planification Et Gestion de l’ASsainissement des Eaux), développé à l’Aquapôle de l’Université de Liège a été utilisé pour réaliser une première simulation test de la cocaïne dans le réseau hydrographique belge. La principale conclusion de cette simulation test est qu’il est possible de simuler le devenir des dérivés de la cocaïne dans les eaux de surface ; cela démontre également la cohérence des mesures réalisées dans le cadre de l’étude COWAT. Des améliorations mineures au modèle PEGASE et aux données d’entrée seraient cependant souhaitables pour améliorer cette modélisation (possibilité de faire varier l’équivalent-habitant par zones).PEGASE: UN MODÈLE INTÉGRÉ BASSIN HYDROGRAPHIQUE / RIVIÈRES: PREMIÈRE APPLICATION TEST À LA COCAÏNE

Effects of agricultural land use on fluvial carbon dioxide, methane and nitrous oxide concentrations in a large European river, the Meuse (Belgium)

peer reviewedWe report a data-set of CO2, CH4, and N2O concentrations in the surface waters of the Meuse river network in Belgium, obtained during four surveys covering 50 stations (summer 2013 and late winter 2013, 2014 and 2015), from yearly cycles in four rivers of variable size and catchment land cover, and from 111 groundwater samples. Surface waters of the Meuse river network were over-saturated in CO2, CH4, N2O with respect to atmospheric equilibrium, acting as sources of these greenhouse gases to the atmosphere, although the dissolved gases also showed marked seasonal and spatial variations. Seasonal variations were related to changes in freshwater discharge following the hydrological cycle, with highest concentrations of CO2, CH4, N2O during low water owing to a longer water residence time and lower currents (i.e. lower gas transfer velocities), both contributing to the accumulation of gases in the water column, combined with higher temperatures favourable to microbial processes. Inter-annual differences of discharge also led to differences in CH4 and N2O that were higher in years with prolonged low water periods. Spatial variations were mostly due to differences in land cover over the catchments, with systems dominated by agriculture (croplands and pastures) having higher CO2, CH4, N2O levels than forested systems. This seemed to be related to higher levels of dissolved and particulate organic matter, as well as dissolved inorganic nitrogen in agriculture dominated systems compared to forested ones. Groundwater had very low CH4 concentrations in the shallow and unconfined aquifers (mostly fractured limestones) of the Meuse basin, hence, should not contribute significantly to the high CH4 levels in surface riverine waters. Owing to high dissolved concentrations, groundwater could potentially transfer important quantities of CO2 and N2O to surface waters of the Meuse basin, although this hypothesis remains to be tested

PEGASE : Planification Et Gestion de l'ASsainissement des Eaux : Présentation générale du modèle

Le but de cette communication était de présenter aux acteurs du bassin Artois-Picardie le modèle PEGASE développé initialement pour la Région Wallonne et alors en cours d'application sur l'ensemble du bassin de l'Escaut dans le cadre d'un programme LIF

Analyse exergétique du rayonnement

Le but de ce travail était de trouver des formulations qui permettent de calculer le travail maximal récupérable (l'exergie) d'une source de chaleur sous forme de rayonnement (et plus spécifiquement le rayonnement des flammes. Le travail a permis de trouver des formulations applicables à un rayonnement quelconque. Quant au cas particulier des flammes, il faudrait pouvoir modéliser réellement les flammes pour obtenir des formules applicables. L'étude a cependant montré (en utilisant une méthode spectrale) que l'exergie (donc l'énergie récupérable) du rayonnement d'une flamme était plus petit que ce à quoi on s'attendait, en supposant un rayonnement "gris

Wet cooling tower plume behavior in the vicinity of thermal power plants

La plupart des centrales électriques thermiques (entre autres les centrales nucléaires) sont équipées de réfrigérants atmosphériques pour évacuer l'énergie non transformée en électricité. Le but de ce travail était de montrer les effets météorologiques potentiels des tours de refroidissement humides à tirage naturel. Avec les techniques modernes (qui éliminent de fait les risques de verglas et de pluie), ce sont les réductions d'insolation qui ont le plus d'impac