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See detailHydrological instrumentation of a pilot catchment in view to improve the soil loss modeling: focus on the spatial distribution of erosion and deposition (loamy region, Belgium)
Pineux, Nathalie ULg; Degré, Aurore ULg

Poster (2012, July 02)

Nowadays, lots of catchments are affected by inundations or mudflows which are the consequences of excessive runoff and accelerated erosion. That generates also a significant loss of arable land. Yet, the ... [more ▼]

Nowadays, lots of catchments are affected by inundations or mudflows which are the consequences of excessive runoff and accelerated erosion. That generates also a significant loss of arable land. Yet, the soil resource is not an unlimited commodity. Moreover, sediments’ transfer to watercourses alters their physical and chemical quality. The watershed management should aim at both limiting erosion and enhancing deposition in appropriate zones. Therefore, the global objective of this work is to acquire hydropedological data in order to better quantify the erosion and deposition phenomenon in Belgium. The poster presents the field monitoring put in place in our experimental watershed. Indeed, observed quantitative data are essential but still limited. Particularly, we lack observations spatially distributed on the watershed. The watershed is a 124 ha agricultural zone in the loamy region. Its slopes range from 0% to 9%. Instrumentation includes a weather station with disdrometer, discharge measurement at the outlet coupled with water sampling. Fields observations are done to determine the texture redistribution and compared with a previous soil survey realised in 1958. Moreover, regular flights above the area will allow us to obtain a very accurate DEM using Lidar technology (5cm pixel) and observing the relief evolution. The CAESAR model will be tested on this watershed. It aims at representing both erosion and sedimentation and estimates the net erosive flows. This model is based on the Einstein-Brown equations and needs an initial digital elevation model, hourly rainfalls, soil texture, etc. It produces a digital elevation models’ evolution through time. [less ▲]

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See detailHydrological modeling of the EU Nitrates Directive Actions Programme:
Sohier, Catherine ULg; Dautrebande, Sylvia; Degre, Aurore ULg

Poster (2009, December 11)

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See detailHydrological modelling of the EU Nitrates Directive Actions Programme: new developments in the Walloon Region (Belgium)
Sohier, Catherine ULg; Dautrebande, Sylvia; Degre, Aurore ULg

Poster (2010, April)

Wallonia (Southern Region of Belgium) implemented the Nitrates Directive through a first actions plan in 2002 followed by a second action plan in 2007. It designated vulnerable zones and introduced ... [more ▼]

Wallonia (Southern Region of Belgium) implemented the Nitrates Directive through a first actions plan in 2002 followed by a second action plan in 2007. It designated vulnerable zones and introduced various mandatory practices in order to reduce the nitrate contamination risk. At the same time, the government decided to fund non mandatory practices focused on agro-environment. Some of these (like buffer strips) should also be useful in nutrient mitigation. In order to assess the global effectiveness of all the mitigation practices, we have been developing a hydrological model spatially distributed using a 1km² grid cell on the whole Region (16 900 km²). The EPICgrid model represents the root zone and the vadose zone. In Wallonia, groundwater tables are more than 30 m deep in 8% of the territory. It is therefore of major importance to fill the gap between the root zone and the groundwater bodies. It allows us to assess the nitrate transfer time and forecast the mitigation measures’ effect in time, space and amplitude. On the ground, runoff and sediment yield are modelled at the small watershed scale in order to assess buffer strips’ effect on sediment deposition and its consequences on N and P mitigation. The poster will explain the more recent results that consist in forecasting action plans’ effect until 2015 (on both surface water bodies and groundwater bodies) and modelling of the current buffer strips’ effect. [less ▲]

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See detailHydrological response to climate change in the Lesse and the Vesdre catchments: contribution of a physically based model (Wallonia, Belgium)
Bauwens, Alexandra ULg; Sohier, Catherine ULg; Degre, Aurore ULg

in Hydrology & Earth System Sciences (2011), 15

The Meuse is an important rain-fed river in North-Western Europe. Nine million people live in its catchment, split over five countries. Projected changes in precipitation and temperature characteristics ... [more ▼]

The Meuse is an important rain-fed river in North-Western Europe. Nine million people live in its catchment, split over five countries. Projected changes in precipitation and temperature characteristics due to climate change would have a significant impact on the Meuse River and its tributaries. In this study, we focused on the impacts of climate change on the hydrology of two sub-catchments of the Meuse in Belgium, the Lesse and the Vesdre, placing the emphasis on the water-soil-plant continuum in order to highlight the effects of climate change on plant growth, and water uptake on the hydrology of two sub-catchments. These effects were studied using two climate scenarios and a physically based distributed model, which reflects the water-soil-plant continuum. Our results show that the vegetation will evapotranspirate between 10 and 17% less at the end of the century because of water scarcity in summer, even if the root development is better under climate change conditions. In the low scenario, the mean minimal 7 days discharge value could decrease between 19 and 24% for a two year return period, and between 20 and 35% for a fifty year return period. It will lead to rare but severe drought in rivers, with potentially huge consequences on water quality. [less ▲]

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See detailHydrologie générale
Degre, Aurore ULg

Learning material (2008)

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See detailHydrologie générale : le bassin versant
Degre, Aurore ULg; Hirtt, Laura ULg; Beckers, Eléonore ULg

Learning material (2010)

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See detailL’hydrologie, une partenaire de la géomorphopédologie pour une gestion transéchelle des grands enjeux environnementaux
Degre, Aurore ULg; Sohier, Catherine ULg; Colard, François ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2011), S2(15), 699-707

Unsaturated soil and subsoil are often called “critical zone” considering their major interfacing role in our environment. Dealing with solute transfer or water and soil conservation, hydrologic research ... [more ▼]

Unsaturated soil and subsoil are often called “critical zone” considering their major interfacing role in our environment. Dealing with solute transfer or water and soil conservation, hydrologic research relies on pedologic descriptions. It is the case from micro to macro scale analysis. Hydrodynamic parameters are derived from pedologic information on soil. They allow hydrologists to quantify and spatially describe the dynamic exchanges between water, soil, crops and atmosphere. The modelling of water and solute transfer through soil and vadose zone also needs them. The paper presents some research highlights on soil behaviour, hydrological modelling and forecasting under climate change. Erosion is another major topic. Soil is a poorly renewable resource. Soil conservation and soft hydraulic management in watersheds deserve more attention. They can help limiting nutrient and sediment transfer to surface water. Again, pedologic information is the starting point of conceptualization and modelling. Furthermore, the Soil Map of Belgium includes information on geomorphology and landscape descriptions which date from decades. They are of first importance to calibrate and validate detachment, transport and sedimentation models. In the current context of high environmental concern, it is demonstrated how hydrology and pedology have to be partners in order to deal with such major issues. [less ▲]

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See detailL’hydrologie, une partenaire de la géomorphopédologie pour une gestion transéchelle des grands enjeux environnementaux
Degre, Aurore ULg; Sohier, Catherine ULg; Colard, François ULg et al

Conference (2010, November 24)

La zone insaturée du sol et du sous-sol est souvent qualifiée de zone critique, étant donné son rôle d’interfaçage entre les compartiments aérien et souterrain de notre environnement. Dans les thématiques ... [more ▼]

La zone insaturée du sol et du sous-sol est souvent qualifiée de zone critique, étant donné son rôle d’interfaçage entre les compartiments aérien et souterrain de notre environnement. Dans les thématiques du transfert des solutés ou de la conservation des eaux et des sols, les recherches d’hydrologie et d’hydraulique agricole s’appuient sur les informations pédologiques et ce depuis une échelle extrêmement locale jusqu’à la vision régionale de la gestion environnementale. Le rôle des descriptions pédologiques dans la gestion et la protection des ressources naturelles est donc majeur. La dérivation des paramètres hydrodynamiques depuis les descriptions pédologiques des sols permet à l’hydrologue de quantifier et de représenter spatialement la dynamique des échanges eau-sol-végétation-atmosphère, les déplacements de l’eau dans le sol et la vadose ainsi que les déplacements et les transformations des solutés. L’hydrologue en retire des indicateurs de pression sur les ressources hydriques de surface et souterraine. Il calcule des flux d’eau, de nutriments et de sédiments à un pas de temps très fin et durant de longues périodes (plus de 30 années). Les recherches présentées ici couvrent la modélisation hydrologique physiquement basée à l’échelle régionale qui vise l’analyse prospective (au-delà de 2020) des mesures envisagées pour limiter les pollutions diffuses d’origine agricole, tout comme des modélisations physiques détaillées en sites expérimentaux. L’érosion hydrique des sols est un autre un enjeu majeur de gestion environnementale. Le sol étant une ressource peu renouvelable, les techniques de conservation des sols et l’aménagement hydraulique des bassins versants ruraux nécessitent la plus grande considération. Elles sont un outil supplémentaire de limitation des apports au cours d’eau (tant en termes de sédiments qu’en termes de nutriments). Là encore, les descriptions pédologiques permettent de cibler les sols les plus sensibles. De plus, les cartes des sols qui incluent une interprétation géomorphologique permettent de confronter les modèles d’arrachement, de transport et de dépôt de sédiments aux observations des pédologues faites lors des premiers levés et actuellement en cours. Ces observations de terrain, réalisées à plusieurs dizaines d’années d’intervalle, constituent un gisement de données précieux et quasiment unique pour la validation des modèles hydrologiques de perte en sol et de dépôt et en vue de l’étude morphodynamique des bassins versants. Il reste actuellement des besoins en termes de description pédologique. Ils ont trait à la caractérisation plus fine de certains sigles, où l’introduction d’éléments relatifs à la dynamique des flux pourrait s’avérer pertinente. Toutefois, on peut constater que dans le contexte actuel et crucial de préservation des ressources eau et sol, l’hydrologie et la science du sol sont réaffirmées comme des partenaires forts de gestion des grands enjeux environnementaux. [less ▲]

Detailed reference viewed: 61 (34 ULg)
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See detailHydrology and fluvial dynamics, in Geography Research in Belgium, Comité National de Géographie, DENIS J. (Ed.)
Petit, François ULg

in Bulletin de la Société Belge d'Etudes Géographiques = Tijdschrift van de Belgische Vereniging voor Aardrijkskundige Studies (1996)

Detailed reference viewed: 7 (2 ULg)
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See detailHydrolysate preparation and comparative amino acid determination by cation-exchange and gas-liquid chromatography in diet ingredients
De Schrijver, Ronny; Van Eenaeme, Christian ULg; Fremaut, D. et al

in Cerevisia and Biotechnology (1991), 16(4)

Detailed reference viewed: 5 (2 ULg)
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See detailHydrolyse Enzymatique de la Cellulose
Paquot, Michel ULg; Thonart, Philippe ULg

in - (1980, July)

Detailed reference viewed: 3 (0 ULg)
See detailHydrolyse enzymatique de la cellulose de paille - Traitement mécanique et chimique.
Thonart, Philippe ULg; Paquot, Michel ULg; Foucart, M. et al

Poster (1980, October)

Detailed reference viewed: 19 (2 ULg)
See detailHydrolyse enzymatique de la cellulose de paille, traitement mécanique et chimique [dégradation de la paille de blé, production de glucose].
Thonart, Philippe ULg; Paquot, Michel ULg; Foucart, M. et al

in Cahiers Trimestriels - Entretiens écologiques de Dijon (1981), (9),

Detailed reference viewed: 45 (2 ULg)
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See detailHydrolyse Enzymatique de la Cellulose régénérée.
Paquot, Michel ULg; Thonart, Philippe ULg

in Holzforschung : International Journal of the Biology, Chemistry, Physics, & Technology of Wood (1982), 36

Detailed reference viewed: 18 (6 ULg)
See detailHydrolyse enzymatique de la cellulose, une voie de développement possible.
Sacre, E.; Avella, T.; Mottet, A. et al

Scientific conference (1979, April 27)

A collection of 10 papers presented at a colloquium of the Centre de Populiculture du Hainaut, Belgium, on 27 April 1979: Sacre, E. [Characteristics of the wood of Populus euramericana in relation to its ... [more ▼]

A collection of 10 papers presented at a colloquium of the Centre de Populiculture du Hainaut, Belgium, on 27 April 1979: Sacre, E. [Characteristics of the wood of Populus euramericana in relation to its utilization.] Characteristiques du bois de peupliers euramericains en rapport avec son utilisation. 3-22. Avella, T. [Possibility of using poplar sawdust in wood/plastic combinations.] Possibilite d'utilisation de la sciure de peuplier dans les combinaisons bois-plastique. 23-28. Mottet, A.; Thonart, P.; Paquot, M. [Enzymatic hydrolysis of cellulose, a possible line of development.] Hydrolyse enzymatique de la cellulose, une voie de developpement possible. 29-38. Carre, J. [The possibility of using poplar in the particleboard industry.] Les possibilites d'emploi du peuplier dans l'industrie du panneau de particules. 39-52. Papegnie, F. [Poplar wood for carpentry.] Le bois de menuiserie en peuplier. 53-59. Bocks, C. [The future of rotary veneer in Belgium.] Perspectives pour le bois de deroulage en Belgique. 60-65. Herpelinck, M. [External quality criteria for poplar for peeling in the match industry.] Criteres exterieurs de qualite du peuplier pour deroulage dans l'industrie allumettiere. 66-69. Picron, G. [Defects of poplar veneer in the match industry.] Les defauts du bois de peuplier deroule en industrie allumettiere. 69-80. Gillin, O. [Price comparison for poplar saw timber and veneer.] A quel prix peut-on faire du peuplier de sciage ou de deroulage. Sory, M. [Relationships between proprietors and timber merchants.] Les rapports entre proprietaires et exploitants. 94-99. [less ▲]

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See detailHydrolyse enzymatique de pâtes de papaterie. Dosage des sucres obtenus en fonction des traitements mécaniques
Tshiamala, T.; Bouillet, A.; Wathelet, Bernard ULg et al

in Holzforschung : International Journal of the Biology, Chemistry, Physics, & Technology of Wood (1980), 34

Wood pulps (from hard wood and softwood) and waste papels wele hydrolysed by an enzymatic saccharification process. Sugars products were analysed by gaz chromatography. Typs of pulps, mechanical treatment ... [more ▼]

Wood pulps (from hard wood and softwood) and waste papels wele hydrolysed by an enzymatic saccharification process. Sugars products were analysed by gaz chromatography. Typs of pulps, mechanical treatment and enzymes have been investigated. Mechanical treatment (refining and bearing do not significately affect copper number, degree of polymerisation and pentosan content' Enzymic digestibiîity is enhanced during bearing. This increase digesdbility is apparently not related to the destruction of cellulose super molecular structure. [less ▲]

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See detailHydrolyse enzymatique de pâtes de papeterie - Influence des traitements mécaniques de préparation
Thonart, Philippe ULg; Paquot, Michel ULg; Mottet, Alphonse

in Holzforschung : International Journal of the Biology, Chemistry, Physics, & Technology of Wood (1979), (33), 197-202

Detailed reference viewed: 9 (2 ULg)
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See detailHydrolyse enzymatique de pates de papeterie [de feuilleus et de resineux].
Thonart, Philippe ULg; Paquot, Michel ULg; Mottet, A.

in Holzforschung (1980), 33(6),

Detailed reference viewed: 4 (1 ULg)
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See detailHydrolyse enzymatique de résidus d'extraction alcaline d'écorces de pinus pinaster.
Parajo, J.-C.; Paquot, Michel ULg; Foucart, M. et al

in Belg. Journ. of Food Chem. and Biotech (1988), 43(2), 51-58

Detailed reference viewed: 2 (0 ULg)