References of "Petit, François"
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See detailApproche méthodologique pour la délimitation des espaces de liberté des rivières du massif ardennais
Snijders, Jean-Philippe; Hallot, Eric ULg; Houbrechts, Geoffrey ULg et al

in Bulletin de la Société Géographique de Liège (2006), 48

Dans les schémas départementaux d’aménagement et de gestion des cours d’eau (France), le concept d’espace de liberté des cours d’eau, introduit en 1991, attribue à la rivière un espace de mobilité propre ... [more ▼]

Dans les schémas départementaux d’aménagement et de gestion des cours d’eau (France), le concept d’espace de liberté des cours d’eau, introduit en 1991, attribue à la rivière un espace de mobilité propre, de manière à restaurer la dynamique naturelle d’érosion des berges. Une partie de la méthodologie proposée repose sur l’utilisation de documents cartographiques anciens en vue de déterminer les espaces de divagation historique des cours d’eau. Cette démarche a été appliquée à différentes rivières du massif ardennais (Ourthe, Amblève, Semois, Rulles). Les espaces de mobilité obtenus pour ces rivières étant assez réduits, il a été nécessaire de prendre en considération les erreurs liées à la correction géométrique et au géoréférencement des différents documents utilisés. L’utilisation des microscories, rejets de l’ancienne industrie du fer, en tant que marqueur stratigraphique, nous a permis de tester, sur plusieurs rivières, les vitesses d’érosion latérale obtenues par la méthode cartographique. En conclusion, la méthode cartographique entraîne une nette surestimation des vitesses d’érosion latérale et des espaces de mobilité des cours d’eau dans leur plaine alluviale. [less ▲]

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See detailLa Cartographie des Zones Inondées : Approche géomorphologique et Enquêtes de Terrain
Peeters, Alexandre ULg; Van Campenhout, Jean ULg; Donnay, F. et al

in Les risques majeurs en Région wallonne : prévenir en aménageant (2006)

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See detailUtilisation des microscories métallurgiques comme traceur de la sédimentation dans les plaines alluviales ardennaises
Houbrechts, Geoffrey ULg; Petit, François ULg

in l'érosion entre société, climat et paléoenvironnement (2006)

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See detailLa dynamique fluviale d’un cours d’eau de marge passive : le Chassezac (Cévennes, France)
Jacob, N.; Gob, F.; Bravard, J. P. et al

in Géomorphologie : Relief, Processus, Environnement (2006)

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See detailCritical specific stream power in gravel-bed rivers
Petit, François ULg; Gob, Frédéric ULg; Houbrechts, Geoffrey ULg et al

in Geomorphology (2005), 69(1-4), 92-101

Experiments with marked pebbles were carried out on different sized rivers of the Belgian Ardenne (catchment areas varying from less than I km(2) to 2700 km(2)). Specific stream power required to cause ... [more ▼]

Experiments with marked pebbles were carried out on different sized rivers of the Belgian Ardenne (catchment areas varying from less than I km(2) to 2700 km(2)). Specific stream power required to cause bedload movement was evaluated and critical values were obtained. Three types of relationship between critical specific stream power (omega(0)) and grain size (D) were established. The values for coo in the largest river (the Ourthe) were the lowest and were close to the values obtained for mountainous rivers carrying large boulders. In medium sized rivers (catchment area between 40 and 500 km(2)), the critical unit stream power was higher. It is likely that it is due to the bedform's greater resistance. This resistance would use up some of the energy that can cause movement and transport of bedload. The amount of resistance of the bedform can be expressed as bedform shear stress (tau ''), determined by the relationship between grain shear stress (tau'-that determines movement and transport of the bedload) and the total shear stress (tau). This ratio varies between 0.4 and 0.5 in the medium sized rivers, compared to 0.7 in the Ourthe. In headwater streams (less than 20 km(2)), there is greater loss of energy due to bedform resistance (tau'/tau < 0.3). Critical specific stream power is higher in this third type of river than in the other two. (c) 2005 Elsevier B.V. All rights reserved. [less ▲]

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See detailHabitat use of juvenile Atlantic salmon (Salmo salar): the relation between physical variables and individual mobility.
Roy, Mathieu; Ovidio, Michaël ULg; Enders, Eva et al

Conference (2005, May)

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See detailRiver dredging, channel dynamics and bedload transport in an incised meandering river (the River Semois, Belgium).
Gob, F.; Houbrechts, Geoffrey ULg; Hiver, J. M. et al

in River Research & Applications (2005)

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See detailAnalyse des inondations en aval du barrage de Nangbeto sur le fleuve Mono (Togo et au Bénin).
Ago, Expédit Evariste ULg; Petit, François ULg; Ozer, Pierre ULg

in Geo-Eco-Trop (2005), 29

The analysis of risk of flood downstream from the hydroelectric dam of Nangbeto in the Mono River was about the survey of interannual variability of rainfall and rivers flows from 1955 to 1999, the ... [more ▼]

The analysis of risk of flood downstream from the hydroelectric dam of Nangbeto in the Mono River was about the survey of interannual variability of rainfall and rivers flows from 1955 to 1999, the population vulnerability, the hydrological modification and the impacts downstream in Togo and Benin from the dam constructed in 1987. The analysis of the mean annuel discharge has revealed no tendency, showing thus that the change of land use, the increase of waterproof areas and even the functioning of the hydroelectric dam have not modified in a significant manner the river's rate of flow. Apart from the return to the improvement in rainfull as far back as the end of years 80, the anthropic pressure and the demographic explosion have best explained the magnitude and frequency of flooding downstream from the hydroelectric dam of Nangbeto. The soil degradation, the deforestation of the floodplain, the increase in the number of human settlements in the river boundary increases the vulnerability of population faced with flooding. [less ▲]

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See detailDetermining the competence of mountainous Mediterranean streams using lichenometric techniques
Gob, F.; Jacob, N.; Bravard, J. P. et al

in International Association of Hydrological Sciences : “River Catchment Dynamics : Natural Processes and Human Impacts (2005)

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See detailEvaluation des puissances spécifiques de rivières de moyenne et de haute Belgique
Petit, François ULg; Hallot, Eric ULg; Mols, J. et al

in Bulletin de la Société Géographique de Liège (2005)

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See detailParamètres hydrologiques et physico-chimiques de sources du Crétacé du Pays de Herve et de la Hesbaye sèche
Mols, J.; Petit, François ULg

in Bulletin de la Société Géographique de Liège (2005)

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See detailTurbulence et patron d’utilisation de l’habitat du saumon atlantique juvénile
Roy, M. L.; Ovidio, Michaël ULg; Hallot, Eric ULg et al

Scientific conference (2004)

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See detailElaboration d’une typologie hydro-géomorphologique de cours d’eau dans l’Euregio Meuse-Rhin
Hallot, Eric ULg; Schmitt, L.; Mols, J. et al

in Mosella - XXIX, 3-4 (2004)

This paper shows the first results of a method of river hydro-geomorphological typology applied on the Euregio Maas-Rhine. This is based on non factorial multivariate analysis (clusters) of only ... [more ▼]

This paper shows the first results of a method of river hydro-geomorphological typology applied on the Euregio Maas-Rhine. This is based on non factorial multivariate analysis (clusters) of only quantitative data automatically extracted from DEM or obtained by field measurements with a simplified protocol. The regional differentiation of variables allows the automatic characterization of rivers especially with the specific stream power. [less ▲]

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See detailImpact of hydroelectric power releases on the morphology and the sedimentology of the bed of the Warche River (Belgium).
Assani, A. A.; Petit, François ULg

in Earth Surface Processes & Landforms (2004)

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See detailMorphodynamics of the Meuse River and its tributaries in the Ardenne Massif
Petit, François ULg

in Symposium pour la Protection de la Meuse (2004)

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