High shell deposition of the invasive clam Corbicula fluminea (Müller, 1774) on alluvial bars : exploratory investigations and biogeomorphological research perspectives
Action biogène ; Bancalluvial ; Biogéographie ; Biogéomorphologie ; Cours d'eau ; Ecologie ; Ecosystème aquatique ; Espèce invasive ; France ; Garonne ; Habitat ; Mollusque
Alluvial bar ; Aquatic ecosystem ; Biogenic process ; Biogeography ; Biogeomorphology ; Ecology ; France ; Garonne ; Habitat ; Invasive species ; Mollusca ; Stream
A partir d’observations entreprises sur la moyenne Garonne, les AA. suggèrent que dans les hydrosystèmes fluviaux envahis, et à certains emplacements sur les bancs alluviaux, C. fluminea représente potentiellement un nouveau facteur de construction
Afon Rheidol ; Chenal alluvial ; Cours d'eau ; Géographie de l'Europe ; Géomorphodynamique ; Royaume-Uni ; Régularisation de l'écoulement ; Sédimentation ; Sédimentologie ; Wales
qu'un banc lobé initial semble à l'origine d'une séparation de l'écoulement et de la construction des berges. La taille des particules se réduit en fonction de la dynamique hydraulique selon les profils longitudinaux et transversaux. La dispersion
Banc fluvial ; British Columbia ; Canada ; Chenal anastomosé ; Cours d'eau ; Fluviatile ; Géométrie hydraulique ; Morphométrie ; Méandre
Century scale patterns of three-dimensional growth and development, and the consequent scaling relations of alluvial bars are examined along the gravel-bed reach of lower Fraser River , British Columbia, Canada. A retrospective view based on maps
Lithology, through its influence on sediment production, may have an important effect on the size of alluvial fans and, hence, on fan-basin morphometric relations. The purpose of this study is to evaluate the influence of lithologic erodibility
on the relation between alluvial fan area and drainage basin area.
Alluvial cone ; Fluvial processes ; Hydrology ; Mathematical model ; Model ; Sedimentology
A mathematical model which estimates the scale-independent sediment surface profile of alluvial fans has been developed. This model utilizes a diffusive sediment transport model and an unsteady, radial flow, conservation relationship. The model
suggests that the overall dimensionless morphology of alluvial fans is governed more by fundamental diffusion principles in sediment deposition than by individual environmental or basin characteristics. A preliminary comparison indicates that this model
provides useful qualitative and quantitative information relating to alluvial fan process and morphology.
karst area two types of alluvial fans appear on carbonate bedrock. Members of the first type are ordinary alluvial fans with active alluvial processes where flysch derived sediment covered limestone surface in a distinct fan shape. - (L'A.).
In studying alluvial deposits from the Torre del Loro Beach near Huelva, southwestern Spain, it has been possible to describe not only processes and morphology of alluvial fans, but to track evolutionary changes in the morphology of the alluvial
Cone aluvial do Taquari, unidade geomorfica marcante na planicie quaternaria do Pantanal. (Cône alluvial du Taquari, unité géomorphologique remarquable dans la plaine quaternaire du Pantanal)
Description des unités géomorphologiques du cône alluvial du Taquari dans le Pantanal, qui correspond à une intense activité érosive torrentielle sub-récente. (ASA).
Field and modern analytical methods have shown that Floodplain soils with a pronounced A2 horizon are a large group of soils that occur under various ecologic conditions. They include Alluvial Sod Acid and Meadow Acid residual podzolized or residual
Gray Forest soils, Alluvial Sod-Podzolic and Alluvial Gray Forest residual-sod soils, Alluvial Pseudopodzolic (Pseudogley) soils, Alluvial Sod-Podzolic soils, and Alluvial Gray Forest soils. Classification and nomenclature of these soils should take
Morphology and development of an alluvial fan in a permafrost region, Aklavik Range, Canada
Alluvial cone ; Arid area ; Canada ; Gelifluction ; Periglacial features ; Permafrost ; Sedimentology ; Snow
The objectives of this study are to describe the morphology and sedimentology of an alluvial fan, the Mount Goodenough North fan, in a permafrost region; and to interpret the processes responsible for the development of the fan, using both direct
The age of alluvial fan deposition at a site in the southern uplands of Scotland
Alluvial cone ; Archaeology ; C 14 dating ; Dating ; Fluvial processes ; Palynology ; Scotland ; Stratigraphy ; United Kingdom
The age of a large alluvial fan debouching onto the valley floor of the River Tweed, in southern Scotland, and the sequence of events relating to this, are investigated using geomorphological, sedimentological, palynological, archaeological
Grâce à 8 datations au 14C d'échantillons de bois des dépôts de terrasse et du cône alluvial, identifie deux phases d'érosion Holocène| l'une vers 5400 BP mais avant 1900 BP, l'autre vers 900 BP. - (CB)