Search results for "Geomorphology"
showing 10 items of 395 documents
An erratic dropstone of granodiorite with a water-escape structure from a Weichselian terrace along the River Gauja (NE Latvia)
2016
Abstract A river terrace of the River Gauja (Latvia), built of Weichselian glaciolacustrine deposits, contains a large number of erratic boulders from the Fennoscandian Shield. These erratic boulders include several types of granites and granodiorites. Some of the granodiorites are so strongly weathered that they fall apart into mm-sized grains of individual minerals when it is attempted to take them out of the host sediment. This strongly weathered nature makes them physically comparable to unconsolidated sand. A consequence is that they may be subjected to soft-sediment deformation. The erratic granodiorite boulder under study here is the first described to show such a soft-sediment defor…
Soil erosion rates in Burgundian vineyards.
2006
Burgundian vineyards are affected by erosion phenomena that induce sediment transfer along hillslopes. The vineyard under study has occupied the western Bressan rift border for 1000 years, benefiting from marly limestone bedrock and its silt-sand covering. The combined effects of rainstorms and monoculture on slopes reaching 25°, induce a high level of erosion in the arable soil layer. Quantification of erosion rates on a pluri-decennial scale, using vine roots'as a palaeo-surface marker, has been performed on three parcels on three sites along the Côtes-de-Nuits and Côtes-de-Beaune. Assessed erosion rates of around 1 mm.yr-1 characterise current erosive dynamics involving a critical situat…
Hydrogéomorphologie du site, paléoenvironnements et dynamique alluviale.
2015
In Landuré C., Arcelin P., Arnaud-Fassetta G. (Eds.) Le village de La Capelière en Camargue (Arles, Bouches-du-Rhône) du début du Ve s. av. n. è. à la période du Haut Moyen Âge - 2017
Evolution of prodeltas : a print of glacier melting processes
2017
International audience; Coastal evolution in meters from 1966 to 2016 Prodeltas evolution in meters from 1966 to 2012 from side scan mosaics the Shoreline evolution measured by calculation between reference points Ice evolution than processes control coastal high-latitudes and how they will Coastal evolution in meters from 1966 to 2016 Question 1 : What are the effects of the glacier retreat on the hydrographic network ? First results show a decrease of the drainage density and the width of the active band which conducts to a clear concentration of the hydrographic ntework. Question 2 : What is the Kongsfjorden line evolution ? Coastal areas supplied by the hydrographic network become small…
Typology of Hirnantian glacial pavements in SW Djado Basin (NE Niger).
2006
11 pages; International audience
Dynamique d’abandon de chenaux dans le territoire de la Petite-Seine
2020
Postglacial changes in fuvial morphologies of the upstream Loire catchment and the middle Cher river valley
2017
International audience; The present study aims to provide new insights of fluvial metamorphosis associated with postglacial environmental changes. Investigations were conducted on different points upstream to downstream of the Loire catchment (Loire itself, Dore river and Cher river). This work allows the role of catchment size to be discussed regarding sensitivity of fluvial environments to climate changes. Topography of the alluvial plain was analyzed using LiDAR DEM. Such datasets show topographic variations highlighting postglacial fluvial patterns and their relative chronology. Boreholes and electrical imaging survey help to estimate the geometry of former channels. Cores collected in …
Dynamique sociétale et évolutions des paysages fluviatiles de la Seine : exemples de paléo-chenaux sur le territoire de la Petite-Seine
2020
International audience
Jura.
2011
Des combes et reculées pittoresques aux formes étranges des lapiaz, signes de l'érosion du temps, en passant par les grottes et cascades caractéristiques des reliefs karstiques, ce guide ne cessera d'étonner le secteur tant le Jura regorge de trésors insolites. Parmi eux, n'oublions pas les innombrables fossiles, vestiges d'une vie jurassique foisonnante, dont les traces des grands dinosaures sont certainement les plus fabuleux.
Mise en évidence de crues antiques sur le site gallo-romain d’Oedenburg.
2003
International audience