References of "Bah, Boubacar Billo"
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See detailSurface water diffuse pollution by PPP: focus on runoff & erosion
Bah, Boubacar Billo ULg; Vandendael, Laurent; Oger, Robert ULg et al

Conference (2012, April 04)

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See detailMise au point d'un Système d'Information Géographique (SIG), à l'échelle de la parcelle, pour l'évaluation du risque de pollution des eaux de surface et souterraines par l'usage des pesticides.
Bah, Boubacar Billo ULg; Limbourg, Quentin; Vandendael, Laurent et al

in Conférence sur les Techniques d’Application de Produits de Protection des Plantes. 15 et 16 mars 2012, Lyon, France (2012, March 15)

L’étude aborde la mise au point d’un outil SIG décisionnel, basé sur une approche « expert » par logique floue, pour l’évaluation du risque de pollution des eaux de surface et souterraines par les ... [more ▼]

L’étude aborde la mise au point d’un outil SIG décisionnel, basé sur une approche « expert » par logique floue, pour l’évaluation du risque de pollution des eaux de surface et souterraines par les pesticides. Une enquête de terrain combinée aux propriétés physico-chimiques des pesticides, a permis d’identifier la pression polluante agricole liée aux propriétés des pesticides et aux activités anthropiques. La sensibilité des sols au transfert des pesticides vers les eaux de surface et souterraines a été évaluée sur base, d’une part d’une approche par modélisation mécaniste, et d’autre part à partir de l’exploitation de l’information qualitative de la carte des sols, jugée pertinente et non explicitement valorisée par le modèle mécaniste. L’évaluation du risque global a ensuite été réalisée à partir de la construction d’un système expert basée sur la logique floue, qui intègre les évaluations spécifiques aux propriétés des pesticides, aux pratiques culturales et à la sensibilité des sols au transfert des pesticides vers les eaux, en tant que milieu transit-vecteur. L’approche par « logique floue » est un outil robuste qui permet notamment d’agréger de façon uniforme des informations de sources variées, mais aussi d’intégrer l’incertitude (imprécision) associée à certaines données, telles que celles liées aux caractéristiques physico-chimiques des pesticides ou des sols. [less ▲]

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See detailValorisation de la Carte Numérique des Sols de Wallonie et d’une base de données disponible en analyse de sols, dans le cadre de l’évaluation du risque de pollution des eaux souterraines par les pesticides
Bah, Boubacar Billo ULg; Vanclooster, Marnik; Oger, Robert ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2011), 15(S2), 709-726

This study shows how the Digital Soil Map of Wallonia and the associated soil database Aardewerk can be combined with the MetaPEARL model to assess the sensitivity of agricultural soils to pesticide ... [more ▼]

This study shows how the Digital Soil Map of Wallonia and the associated soil database Aardewerk can be combined with the MetaPEARL model to assess the sensitivity of agricultural soils to pesticide transfer into underground water tables in Wallonia (Southern Belgium). MetaPEARL is based on an analytical expression which describes the concentration of leached pesticides at the soil profile bottom depending on available data on soil characteristics, climate and pesticide properties. The results show an important soil sensitivity to pesticide transfer with a coefficient of retention on organic matter (Kom) very weak (about 10 dm3.kg-1) or with a relatively high half-life time (DT50 about 60 days). In this case, the pesticide is weakly retained by soil organic matter or slowly degraded and then stays available in the soil and can be quickly leached during rainfalls. In other respects, the pesticide sensitivity to leaching is strongly correlated with soil texture and its organic matter content. It is also observed that the concentration of leached pesticide is strongly depending of the rainfall surplus (water flux into the soil or hydrous balance). A sensitivity analysis has shown that the model is very sensitive to soil thickness, to organic matter content, to the bulk density of the mineral fraction by textural classes and of the organic matter. Therefore, these pedological variables have to be assessed with the highest precision to avoid adding further uncertainty to the predictions obtained. On the basis of the most sensitive soil variables, the analysis of “spatial” uncertainty related to the results delivered by MetaPEARL, due to the consideration of an unique representative value by soil type and by region (deterministic approach), shows that this approach tends to under-estimate the concentration of pesticide leached in the soil. And that compared to the use of a stochastic simulation (probabilistic approach) which takes into account the soil characteristic variability within a given soil type. This stochastic approach allows also the calculation of a more relevant threshold of risk probability (percentile) which can be compared to an imposed standard in view to enhance a sustainable management of natural resources. [less ▲]

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See detailExploitation of the Soil map in Belgium
Bah, Boubacar Billo ULg; Legrain, Xavier ULg; Colinet, Gilles ULg

Conference (2011, October 14)

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See detailPESTEAUX: Implementing MetaPEARL for the Walloon Region in Belgium
Bah, Boubacar Billo ULg; Vanclooster, Marnik; Oger, Robert ULg

Scientific conference (2011, March 29)

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See detailEvaluation de la sensibilité des sols au transfert de pesticides vers les eaux souterraines en Région wallonne (Belgique)
Bah, Boubacar Billo ULg; Mattern, Samuel; Vanclooster, Marnik et al

in Actes des 35èmes Journées du Groupe Francophone Humidimétrie et TraNsferts en milieux poreux (GFHN), Louvain-la-Neuve, Belgique, 23-25 novembre 2010 (2010, November)

Cette étude présente l'utilisation du métamodèle MetaPEARL (Tiktak et al., 2006) pour évaluer la sensibilité des sols au transfert des pesticides vers les eaux souterraines en Wallonie. MetaPEARL prédit ... [more ▼]

Cette étude présente l'utilisation du métamodèle MetaPEARL (Tiktak et al., 2006) pour évaluer la sensibilité des sols au transfert des pesticides vers les eaux souterraines en Wallonie. MetaPEARL prédit la concentration de pesticide lixivié au bas du profil pédologique en fonction de données facilement disponibles sur les sols, le climat, et les propriétés des pesticides. MetaPEARL a été appliqué pour quatre pesticides génériques A, B, C et D (FOCUS, 2000). Les résultats obtenus montrent une sensibilité plus importante des sols de Wallonie aux transferts des pesticides de type A et B, permettant ainsi de distinguer des régions relativement contrastées d’un point de vue de la sensibilité de leurs sols au transfert des pesticides vers les eaux souterraines. Ce contraste régional est corrélé d’une part à la variabilité régionale des teneurs en matière organique des sols, et d’autre part au gradient pluviométrique nord-sud observé en Wallonie. On constate également que la concentration en pesticide lixivié est plus importante en automne qu’au printemps. [less ▲]

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See detailDevelopment of a version of GeoPEARL for the Walloon region of Belgium
Bah, Boubacar Billo ULg; Vanclooster, Marnik; Oger, Robert ULg

Scientific conference (2009, November)

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See detailRisks assessment of water pollution by pesticides at local scale (Pesteaux Project): study of polluting pressure
Noël, Stéphanie; Bah, Boubacar Billo ULg

in Communications in Agricultural and Applied Biological Sciences (2009), 74(1), 165-170

Pollution of water resources (surface waters and ground waters) by pesticide uses is one of the key point of the European policy with the imptementation of the Water Frame Work Directive (2000/60/EC) and ... [more ▼]

Pollution of water resources (surface waters and ground waters) by pesticide uses is one of the key point of the European policy with the imptementation of the Water Frame Work Directive (2000/60/EC) and the thematic Strategy on the Sustainable use of pesticides. According to this Legislation, the Member States must initiale measures to limit environmental and toxicologieal effects caused by pesticide uses. The Agricultural Research Centre of Wallonia (CRA-W) emphasized the need of a toot for spatial risk analysis and develops it within the framework of PESTEAUX project. The originality of the approach proposed by the CRA-W is to generate maps to identify the risk of pollution at locale scale (agricultural parcel). The risk will be assessed according to the study of different factors, grouped under 3 data's tayers: polluting pressure, vulnerability of the physical environment (soil) and meteorological data. This approach is directly based on the risk's definition which takes into account the polluting pressure, linked te the human activities, and the vulnerabitity of the soil, defined by factors of physical environment which characterize the water flow in the parcel. Moreover, meteorological data influence the intensity and likelihoad flow of water, and indirectly pesticide by leaching or runoff. The PESTEAUX's approach to study the pollution is based on the model "source-vector-target". The source is the polluting pressure, in other words, the pesticides which could reach the targets. The main vector is the water which vehicles the pesticide on and trough the soil until the target which are the surface waters or ground waters. ln this paper we introduce the factors contributing to the polluting pressure. These factors are linking to the human activities and more precisely, to the pesticide uses. The factors considered have an influence on pesticide's transport by water (in its solid state or in dissolved state by leaching, run-off, or erosion) but also on a set of process controlling pesticide behavior in the environment such as degradation, sorption, .... [less ▲]

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