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  • 05 juin Séminaire
    Glazed and Diffused for 50,000 Years: Megadunes, Metamorphism and Prograding Antidunes on the East Antarctic Plateau

    The high East Antarctic plateau contains more than 500,000 km2 of dune formations within which more than half their area shows no accumulation.  Most dunes are in trains of several 2–5 km wavelengths, with wind-glazed lee sides and rough, accumulating windward sides.  These dunes grow as they prograde upglacier into the wind, while the ice brings them downslope.  200-MHz ground-penetrating radar profiles show that the largest of these dunes contain beds up to 50 m thick and bedding sequences over 25 km long, which suggests their glazed leeward slopes have been exposed for thousan

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  • 17 avr Séminaire
    Invariance d’échelles des activités enzymatiques dans les sols

    Il est de plus en plus admis que la dynamique du C dans les sols est limitée par l'accès qu'ont les communautés microbiennes aux substrats organiques plutôt que par une récalcitrance intrinsèque de la matière organique ou par une incapacité des communautés microbiennes à décomposer la matière organique disponible.

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  • 13 avr Actualité
    Soutenance de thèse de Juliette Anglade

    Agriculture biologique et qualité des ressources en eau dans le bassin de la Seine. Caractérisation des pratiques et applications territorialisées

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  • 10 avr Séminaire
    Hydrogeophysical characterization of fractured rock through combined push-pull experimens and single-hole ground penetrating radar

    Push-pull experiments are a popular method for investigating flow and transport properties of fractured rock systems. During the experiment, a tracer is injected and retrieved at the same location. By introducing a volume of chasing fluid between injection and retrieval, different scales of the system can be probed. By further allowing a resting period of the tracer non-reversible effects can be investigated. However, push-pull experiments are limited by ill-defined length scales, lack of information on fracture heterogeneity and the effect of ambient flow.

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  • 09 avr Actualité
    Conseil scientifique

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