References of "Xanthoulis, Dimitri"
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See detailModeling using the SWAT model of water flow and transport in suspension in the watershed of the valley of Wadi El-Hachem
Tadrist, Nassima ULg; DEBAUCHE, OLIVIER ULg; Degré, Aurore ULg et al

Poster (2014, May 12)

In the Maghreb, dams regularly suffer from excessive siltation due to erosion problems present in the catchment areas. The origins of this erosion are multiple: land use, deforestation, land affectation ... [more ▼]

In the Maghreb, dams regularly suffer from excessive siltation due to erosion problems present in the catchment areas. The origins of this erosion are multiple: land use, deforestation, land affectation , ... Hydrology coupled with geographic information systems allows using distributed and physically based models to predict the evolution of siltation of dams. The application of these models in Algeria will finally predict the impact of anti-erosion measures, land use patterns on the siltation of dams accurately estimating the amount of sediment produced by erosion runoff and the degree of filling. A methodology based on the map data (digital terrain model, map soil science, geology map and mapping of land use) and daily meteorological data (temperature, relative humidity, wind speed, solar radiation) is being development and testing of the dam Bourkourdane. The SWAT model is used to predict the amount of sediment accumulating in the dam, the water flow rate inbound, outbound, and the volumes of water and sediment stored in the dam. Adequate management of releases, coupled with better management of erosion upstream of the dam will extend the life of dams Algerians. Especially for Boukourdane, improved management of releases is paramount to improve groundwater recharge, fight against the intrusion of marine waters and prevent the accumulation of fine particles that reduce soil permeability. [less ▲]

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See detailConcepts d’efficience et de productivité de l’eau (synthèse bibliographique)
Kambou, Donkora ULg; Xanthoulis, Dimitri ULg; Ouattara, Korodjouma et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2014), 18(1),

Water efficiency and productivity indicators are used in many scientific disciplines, usually to account for water losses that occur during its use, or products generated per unit of water consumed. The ... [more ▼]

Water efficiency and productivity indicators are used in many scientific disciplines, usually to account for water losses that occur during its use, or products generated per unit of water consumed. The interpretation of these indicators is very diverse in the literature. However, the majority of definitions consider water efficiency as a measure of the effectiveness of irrigation, and view water productivity as a measure of the effectiveness of the physiological processes of both biomass production and crop yield formation, linked to the actual consumption of water by the crops. Thus, the consensus seems to be for water application efficiency (Ea) to be considered as the ratio of actual evapotranspiration to the water applied and productivity as the ratio of yield to actual evapotranspiration. The point of divergence relates fundamentally to the understanding of the constituent expressions of productivity (PE, product/“water consumed”) and efficiency of water application (Ea, “water consumed”/“applied water”). Indeed, the term “water consumed” is referred to variously by several authors as “actual evapotranspiration”, “gross irrigation plus rainfall”, “evapotranspiration plus water lost at the plot but beneficial to other users”, etc. Furthermore, while providing more details on the concepts of efficiency and water productivity, this review shows that the factors affecting these indicators have not yet been sufficiently elucidated. Thus, one of the axes of investigation could be to model the application efficiency of water firstly, according to water management practices and secondly, in terms of productivity levels in relation to the crop establishment period. [less ▲]

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See detailLe cloisonnement des interbuttes en culture de pommes de terre : essai réalisé en collaboration avec Bayer CropScience (Huldenberg 2011)
Olivier, C.; Goffart, J.P.; Baets, D. et al

in FIWAP : Brochure du CCP 2012, partie 9.5 (2012)

Dans le sillage du projet « Contrôle du ruissellement et de ses impacts en culture de pomme de terre en Région wallonne 2009-2010 », un essai a été mis en place à Huldenberg sur demande de l’entreprise ... [more ▼]

Dans le sillage du projet « Contrôle du ruissellement et de ses impacts en culture de pomme de terre en Région wallonne 2009-2010 », un essai a été mis en place à Huldenberg sur demande de l’entreprise Bayer CropScience et financé par celle-ci. Pour rappel, le cloisonnement des interbuttes est la mise en place de diguettes entre les buttes de pomme de terre afin de favoriser l’infiltration de l’eau plutôt que son ruissellement. Les résultats de cette nouvelle année d’essai confirment l’efficacité de cette technique quant à la réduction du ruissellement et de l’érosion ainsi qu’une tendance à la hausse des rendements en tubercules. [less ▲]

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See detailLe cloisonnement des interbuttes en culture de pomme de terre : essai réalisé en collaboration avec Bayer CropScience (Huldenberg 2011)
Olivier, Claire; Goffart, Jean-Pierre; Baets, D. et al

in Brochure du Centre Pilote Pomme de terre - FIWAP (2011), 9.5

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See detailCiterne d’eau de pluie et effet sur le débit à l’exutoire du bassin versant de l’Orneau dans la région de Gembloux (Belgique
Xanthoulis, Dimitri ULg; Debauche, Olivier ULg; Fonder, Nathalie et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2011), 15(2), 239-249

This study participates to the quantitative balance of rain water domestic use. It aims towards an optimal design of rain barrels volume, the feasibility of soil infiltration techniques with excess of ... [more ▼]

This study participates to the quantitative balance of rain water domestic use. It aims towards an optimal design of rain barrels volume, the feasibility of soil infiltration techniques with excess of water and the impact assessment of rain barrel on the decrease of peak flow in a pilot rural watershed of 9 km², considering the chronology of precipitation events. The parameters that are considered are the roofs area, the number of inhabitants in the house, the average daily rainfall water consumption, and the local pluviometry. In order to design the infiltration structure associated with the rain barrel, the volume of rainfall excess from the rain barrel needs to be evaluated. Afterwards, the infiltration structure may be dimensioned according to the soil infiltration characteristics. We assume that 75 litres, out of the 115 litres daily consumed by each inhabitant, are coming from the rain barrel and the remainder (40 litres) is drawn from the drinking water distribution network. Calculations are carried out for roofs of 100, 135, 170 and 200 m², for a consumption of water ranging between 150 and 1150 L.day-1.house-1 and for rain barrels of 5, 10 and 20 m³. It appears that if correctly designed private rain barrel allow an opportune water use in households, the effect on flood reduction is, however, limited considering the relative low importance of the collecting surface (1.3% of the watershed surface). [less ▲]

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See detailWater Pollution Monitoring Of Nitrates Leaching From Agricultural Fields With Industrial Crop Harvesting Practices. The Belgian Case Of Onsite Lysimeters As A Monitoring Tool.
Fonder, Nathalie; Marcoen, Jean Marie ULg; Xanthoulis, Dimitri ULg

in IWA. World Water Congress and Exhibition. Proceedings (2010, September)

The European Nitrate Directive (91/676/CEE) aims at moderating or preventing water pollution from nitrates released by agricultural practices. The Belgian Walloon region transposed it into law and ... [more ▼]

The European Nitrate Directive (91/676/CEE) aims at moderating or preventing water pollution from nitrates released by agricultural practices. The Belgian Walloon region transposed it into law and initiated a Sustainable Nitrogen Management Program in 2002 (also called PGDA in French). The non-profit association NITRAWAL amongst others, is in charge of providing support to farmers to implement and respect this program. GRENeRA is one of the organizations designated for scientific studies. In this frame, GRENeRA and its partners implemented six lysimeters in agricultural open fields, operated under real conditions of industrial harvest crops, especially vegetables. The lysimeters are used as follow up tools to monitor and quantify the amount of nitrates leaching beyond the root zone towards underground water reserves. This study demonstrates that lysimeters are efficient and permit the collection of representative samples of seepage water. On a quality stand point, nitrate content combined with data related to agricultural practices, fertilisation rates applied and advised, climate, the defined environmental indicator (APL) provide a global approach to link agricultural practices and underground water protection from nitrate pollution. The lysimeters validate the reliability of the environmental indicator (APL) with the nitrate content in leaching water, which will not be uptaken by the next crop. Unfortunately, it is also demonstrated that even when the nitrogen management is respectful of the current legislation, the goal to comply with the targeted standards of water quality is not ensured. The lysimeter tool clearly show that the respect of seepage water quality standards issued from industrial agriculture does not have to be considered per crop but rather from an integrated and global perspective of the complete crop sequence and rotations, in respect with best agricultural practices, reasonable fertilisation rates, inset crops, etc., for each individual crop being part of the overall rotation. Some favourable and non favourable crop sequences with respect to nitrates content of underground water are summarized. Experiments are in progress on crop sequence evaluation and fertilisation levels and recommendations for Belgian Walloon industrial crops and their associated impacts on the leaching water quality and nitrate content collected by lysimeters. [less ▲]

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See detailEstimating the costs of collective treatment of wastewater: the case of Walloon Region (Belgium)
Dogot, Thomas ULg; Xanthoulis, Yanni; Fonder, Nathalie et al

in Water Science & Technology (2010), 62(3), 640-648

This paper contributes to a better understanding of costs for collective wastewater treatment in the Walloon Region (Belgium). Based on a large set of data, unit costs to population equivalents are ... [more ▼]

This paper contributes to a better understanding of costs for collective wastewater treatment in the Walloon Region (Belgium). Based on a large set of data, unit costs to population equivalents are modelled. Considering investment as well as exploitation costs, the model includes not only wastewater treatment plants but also collector and sewage networks in an integrated approach at the technical basin level. Beyond this modelling, each type of process is analyzed independently in order to explore the structure of investment costs and their variation factors. Then, the model was used to forecast the upcoming expenses for 36 areas which are not yet equipped with collective wastewater treatment facilities. In light of these results, strategic choices for decision makers are discussed. [less ▲]

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See detailL'isotope stable 15Net le lysimètre, des outils complémentaires pour l'étude de la lixiviation de l'azote dans les sols agricoles
Destain, Jean-Pierre ULg; Fonder, Nathalie; Xanthoulis, Dimitri ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2010), 14(S1), 91-96

L’isotope stable 15N a été utilisé dans des expérimentations en cases lysimétriques visant à étudier la lixiviation de l’azote dans les sols agricoles. À Gembloux, un apport de nitrate l’ammoniaque ... [more ▼]

L’isotope stable 15N a été utilisé dans des expérimentations en cases lysimétriques visant à étudier la lixiviation de l’azote dans les sols agricoles. À Gembloux, un apport de nitrate l’ammoniaque présentant une abondance isotopique de 2,161 At%15N a été appliqué à raison de 200 kg N.ha-1 dans deux lysimètres, avant une culture d’épinard suivie de haricot et d’un froment d’hiver. La récupération de l’azote par les cultures a été de 39,8 % dans le premier lysimètre et de 62,2 % dans le second. Les concentrations en azote nitrique des eaux percolées du second ont été constamment plus élevées que dans le premier, probablement à cause d’une moindre immobilisation microbienne. À Remicourt et Omal, un reliquat de 150 kg N.ha-1 (simulé par un apport de 15NH4 15NO3 en automne) a complètement disparu du profil du sol (0-90 cm) dès juillet de l’année suivante. Une culture de froment d’hiver à Omal n’a récupéré qu’environ 9 % de l’azote apporté à l’automne. La mesure de la teneur en azote nitrique des eaux percolées a montré des valeurs nettement plus élevées à Remicourt (jusqu’à plus de 70 mg N.l-1) suite à un apport important de compost riche en azote, qu’à Omal. L’isotope 15N n’a pu être détecté dans aucune des eaux lysimétriques, probablement par un manque de sensibilité de l’appareil. [less ▲]

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See detailOptimisatin de la fertilisation azotée des cultures légumières industrielles sous irrigation
Fonder, Nathalie; Heens, Benoit; Xanthoulis, Dimitri ULg

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2010), 14(S1), 103-111

Les essais ont été menés sur un projet de quatre ans et ont testé cinq cultures légumières pour optimiser la fertilisation azotée sous irrigation avec des eaux usées. Le site expérimental était localisé ... [more ▼]

Les essais ont été menés sur un projet de quatre ans et ont testé cinq cultures légumières pour optimiser la fertilisation azotée sous irrigation avec des eaux usées. Le site expérimental était localisé dans le périmètre irrigué développé autour de l’usine de production de légumes surgelés, Hesbaye Frost. Dépendant de la rotation effectuée par le fermier, dont une partie du champ était sous expérimentation, quatre cultures légumières ont été testées (épinard, haricot, carotte et fève) ainsi qu’une céréale (froment d’hiver). Suite à la mise en place des essais et aux conditions climatiques, les cultures d’épinard en 1999 et de froment en 2000 n’ont pas testé le facteur irrigation. Les facteurs d’expérimentation étaient trois niveaux de fertilisation azotée différents par rapport à un témoin ne recevant pas d’azote minéral complémentaire et un apport ou non d’eaux usées par irrigation. L’impact de ces facteurs a été mesuré sur les rendements et les reliquats azotés dans le sol après culture. Pour les trois cultures légumières de haricot, carotte et fève qui ont pu être irriguées, les rendements ont toujours été statistiquement supérieurs lorsqu’il y avait un apport d’eau complémentaire par irrigation avec les eaux usées. Le facteur fumure a favorablement amélioré les rendements de l’épinard et du haricot, ainsi que le taux de protéines des céréales. Par contre, les parcelles de carotte et de fève qui n’avaient reçu aucune fumure azotée pendant respectivement trois et quatre années consécutives et qui n’ont pas reçu de fertilisation pour leur culture, n’ont pas donné des rendements statistiquement inférieurs. Le facteur fumure, quel que soit le niveau de fertilisation, n’a pas donné des rendements différents pour ces deux cultures. Les reliquats azotés dans le sol après récolte sont restés acceptables et normaux tant que la fertilisation recommandée n’était pas dépassée ; la fertilisation maximale testée, outrepassant les conseils de fumure raisonnée, a systématiquement laissé des reliquats en azote minéral dans le sol en quantité néfaste pour l’environnement. Ces résidus azotés principalement localisés dans les horizons supérieurs pouvaient être considérés comme récupérables par une culture intermédiaire piège à nitrate (CIPAN), pour autant que cette dernière soit installée dès la fin de l’été, l’automne étant considéré comme trop tardif pour avoir une influence sur la récupération de l’azote. Quel que soit le niveau de fertilisation, les reliquats azotés étaient importants pour la culture de fève par un phénomène de minéralisation en surface, dus aux conditions climatiques et à la charge en azote minéral apporté par les eaux usées utilisées pour l’irrigation. Les reliquats azotés en conditions de non-irrigation sont significativement plus importants que sous irrigation. L’irrigation permet une meilleure solubilisation de l’azote, ce qui facilite son assimilation par la culture en place et réduit les quantités résiduelles dans le sol après récolte. [less ▲]

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See detailAdaptation des pratiques agricoles en fonction des exigences de la Directive Nitrates et validation des résultats via le suivi lysimétrique de la lixiviation de l'azote nitrique
Deneufbourg, Mathieu ULg; Vandenberghe, Christophe ULg; Heens, Benoît et al

in Vandenberghe, Christophe; Marcoen, Jean Marie (Eds.) Actes de l'Atelier "Nitrate - Eau" 2 au 5 juin 2009. Peyresq, France (2010)

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See detailSuivi de la percolation du nitrate en terres cultivées par la technique lysimétrique
Fonder, Nathalie; Deneufbourg, Mathieu ULg; Vandenberghe, Christophe ULg et al

in Vandenberghe, Christophe; Marcoen, Jean Marie (Eds.) Actes de l'Atelier "Nitrate - Eau" 2 au 5 juin 2009. Peyresq, France (2010)

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See detailL'isotope stable 15N et le lysimètre, des outils complémentaires pour l'étude de la lixiviation de l'azote dans les sols agricoles.
Destain, Jean-Pierre ULg; Fonder, Nathalie ULg; Xanthoulis, Dimitri ULg et al

in Vandenberghe, Christophe; Marcoen, Jean Marie (Eds.) Atelier Nitrate-Eau. Evaluation du Programme de Gestion Durable de l'Azote. (2010)

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See detailOptimisation de la fertilisation azotée de cultures industrielles légumières sous irrigation
Fonder, Nathalie ULg; Heens, B.; Xanthoulis, Dimitri ULg

in Vandenberghe, Christophe; Marcoen, Jean Marie (Eds.) Atelier Nitrate-Eau. Evaluation du Programme de Gestion Durable de l'Azote (2010)

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See detailEstimating the costs of collective treatment of wastewater : the case of Walloon Region (Belgium)
Dogot, Thomas ULg; Xanthoulis, Y.; Fonder, N. et al

Conference (2009)

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See detailHerbe, diguettes, pesticides et pomme de terre
Maugnard, Alexandre; Bodson, Bernard ULg; Goffart, Jean-Pierre et al

in Phytoma : La Défense des Végétaux (2008), 611

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See detailWastewater treatment management in Belgium (Waloon Region)
Fonder, Nathalie; Xanthoulis, Dimitri ULg; Wauthelet, Marc

in Petrescu-Mag, R. M.; Burny, Philippe (Eds.) Environmental policies and legislation : studies and research (2008)

Belgium is amongst the small European countries. It is a federal state. divided into three regions, corresponding to two different communities (walloon region and Flanders) and a special Region status for ... [more ▼]

Belgium is amongst the small European countries. It is a federal state. divided into three regions, corresponding to two different communities (walloon region and Flanders) and a special Region status for the shared head city (Brussels). Water management belongs to the Regions. The water Directive voted by the European Parliament has been transcribed into Belgian legislation and has to be applied by Regions. The legislation requires that any produced wastewater has to be treated adequately before discharge into environment. This paper will deal neither with industrial, nor agricultural applications of the law, but will focus on the domestic wastewater production, its problems and onsite implemented treatment solutionsl. 12% of the walloon population( inhabitants of small villages in rural areas) will never be connected to any sewage network and thus to any treatment station, such as for cities. Before the end of 2015, these people must treat their own wastewater with officially recognized or not treatment systems. A method has been developed by the Agricultural University of Gembloux as a decision supporting tool for individual or collective systems. The software, named SAIWE (Système d'Assistance et d'lnformation Wallon pour I'Epuration autonome) is a step by step analysism methodology aimed at helping deciderst o identify technical solutions (treatment plants) and to irnplemenl the best suited to local constraints. his paper summarizes official guidelines for those onsite solutions, and gives an overview of natural wastewater treatments applied in Belgium, especially with constructed wetlands use. [less ▲]

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See detailInfluence of the media granular size of small pilot subsurface flow wetlands on axial dispersion and the hydraulic behaviour
Fonder, N.; Xanthoulis, Dimitri ULg

in Wetlands Systems for Water Pollution Control. (2008)

The objective of this paper is to evaluate using tracer tests, the role of the granular media size on the hydraulic behaviour of small -scale pilot horizontal subsurface flow (HSSF) gravel beds. The non ... [more ▼]

The objective of this paper is to evaluate using tracer tests, the role of the granular media size on the hydraulic behaviour of small -scale pilot horizontal subsurface flow (HSSF) gravel beds. The non-ideal flow was modelled by the tank-in-series model (TIS) using the moment analysis and Gamma distribution fitting using the Solver™ routine in Microsoft Excel™; the Plug Flow with Dispersion (PFD) model was also assessed. Tests were performed under a greenhouse in four identical pilot-scale gravel beds of 9:1:1 ratio, which received an equal, inflow of clear water. The influent flow rate was 40 L/day and the surface area of the pilot cells was 0.8 m². The pea gravel media used in the four beds were as follows: 3-5 mm, 6-8 mm, 8-10 mm and 10-12 mm. The tracer used was Potassium Bromide (KBr) with a concentration of 1 g Br/L, using a single-shot injection into the inlet distribution tubes. Tests were repeated three times, with identical materials and methods. Statistical differences were observed between replications. Water loss by evaporation of the unplanted gravel beds was of 11% for the smaller media size (3-5 mm) which is significantly different than the 4 to 5% obtained for the other media sizes. Tracer detention time, tracer peak time, volumetric and hydraulic efficiencies show all the same tendency which is a significant reduction with larger particles sizes. The two methods of calculation for the number NTIS by moment analysis and Gamma distribution fitting (using Solver™) are significantly different. The Gamma model increases the number of TIS with significantly higher values for smaller media sizes. [less ▲]

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See detailCurriculum on Low-cost Wastewater Treatment.
Xanthoulis, Dimitri ULg; Tilly, J.; Fonder, N. et al

Book - 1ère édition (2008)

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See detailSurface water protection against diffuse crop protection products release: results of SWAP-CPP project on potatoes (Belgium)
Maugnard, Alexandre; Bodson, Bernard ULg; Goffart, Jean-Pierre et al

Conference (2007, November 15)

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