Papers by Jean-Claude Ozouf
Gallia préhistoire, 1994
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Geomorphology, 2016
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Geographie Physique et Quaternaire
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Comptes Rendus Geosciences
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Quaternaire, 2013
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Earth Surface Processes and Landforms
An experimental design is described to test the hypothesis that ice segregation near the top of p... more An experimental design is described to test the hypothesis that ice segregation near the top of permafrost and in the lower part of the active layer can brecciate frost-susceptible bedrock. Seasonal temperature cycles in the active layer and the top of permafrost were simulated to a first approximation within a block of chalk measuring 0·30 m × 0·31 m wide and 0·33 m high and insulated around the sides to minimize lateral heat transfer. The block, moistened first by capillary rise, was initially frozen from the surface downwards, simulating permafrost aggradation. Thereafter, the upper half of the block was cycled above and below 0°C (simulating seasonal freezing and thawing of the active layer) while the lower half remained below 0°C (simulating permafrost). During thaw cycles water was supplied to the surface and base of the simulated active layer. Temperature, unfrozen water content, surface frost heave and porewater pressure within the chalk were monitored during the experiment....
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Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science, 1998
In the Touques drainage basin, five alluvial terraces have been distinguished. A multiscale appro... more In the Touques drainage basin, five alluvial terraces have been distinguished. A multiscale approach in a continental basin was undertaken, combining different stratigraphic and geomorphic analyses. Stratigraphic and sedimentologic analyses play an essential role, because of the interaction between climate and sea-level variations and tectonics. In the Touques valley, the alluvial sheets cover the Middle and Upper Quaternary. Each fluvial
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Revue archéologique de l'ouest, 1989
... Gérard VILGRAIN*, Antoine CHANCEREL**, Jean-Pierre COUTARD*** et Jean-Claude OZOUF***. ... Le... more ... Gérard VILGRAIN*, Antoine CHANCEREL**, Jean-Pierre COUTARD*** et Jean-Claude OZOUF***. ... Les teintes rouges extérieures dominent. Le coeur de la pâte est très souvent noir ainsi que l'intérieur, mais parfois la face interne est brune ou beige. ...
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Science (New York, N.Y.), Jan 17, 2006
The volumetric expansion of freezing pore water is widely assumed to be a major cause of rock fra... more The volumetric expansion of freezing pore water is widely assumed to be a major cause of rock fracture in cold humid regions. Data from experiments simulating natural freezing regimes indicate that bedrock fracture results instead from ice segregation. Fracture depth and timing are also numerically simulated by coupling heat and mass transfer with a fracture model. The depth and geometry of fractures match those in Arctic permafrost and ice-age weathering profiles. This agreement supports a conceptual model in which ice segregation in near-surface permafrost leads progressively to rock fracture and heave, whereas permafrost degradation leads episodically to melt of segregated ice and rock settlement.
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Quaternaire, 2013
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Quaternaire, 1998
Les travaux récents menés sur le Pléistocène de la France du Nord-Ouest permettent de compléter e... more Les travaux récents menés sur le Pléistocène de la France du Nord-Ouest permettent de compléter et de réviser les tableaux stratigraphiques publiés dans les années 80. Par rapport à ces premières synthèses, les nouveaux apports sont essentiellement représentés par les éléments ...
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Revue archéologique de l'ouest, 2002
Résumé/Abstract En 1994, le projet d'une déviation routière dans le Pays d'Auge, à mi-c... more Résumé/Abstract En 1994, le projet d'une déviation routière dans le Pays d'Auge, à mi-chemin entre la vallée de la Seine et la plaine de Caen, a donné l'opportunité d'explorer un petit enclos domestique inédit de la fin de La Tène ancienne, localisé sur la commune de Fierville-les-Parcs. Ce site qui se développe en bordure de marais, sur la rive orientale de la Touques, constitue encore aujourd'hui l'unique jalon laténien de ce secteur. Il conviendra de comparer cet ensemble aux établissements et aux mobiliers des régions limitrophes.
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Quaternaire, 2008
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Science, 2006
The volumetric expansion of freezing pore water is widely assumed to be a major cause of rock fra... more The volumetric expansion of freezing pore water is widely assumed to be a major cause of rock fracture in cold humid regions. Data from experiments simulating natural freezing regimes indicate that bedrock fracture results instead from ice segregation. Fracture depth and timing are also numerically simulated by coupling heat and mass transfer with a fracture model. The depth and geometry of fractures match those in Arctic permafrost and ice-age weathering profiles. This agreement supports a conceptual model in which ice segregation in near-surface permafrost leads progressively to rock fracture and heave, whereas permafrost degradation leads episodically to melt of segregated ice and rock settlement.
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Journal of Quaternary Science, 2003
... 50°N Figure 1 The Pleistocene fluvial systems in the western English Channel, northern France... more ... 50°N Figure 1 The Pleistocene fluvial systems in the western English Channel, northern France and southwestern England area. ... Downstream, the River Seine was more sensitive to glacio-eustatic control than in its upstream course, which is more directly controlled by climatic ...
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Géographie physique et Quaternaire, 2000
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Gallia préhistoire, 1982
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Earth Surface Processes and Landforms, 2000
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Comptes Rendus Geoscience, 2002
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Papers by Jean-Claude Ozouf