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Dynamics of periglacial sorted circles in western Spitsbergen
Arctique ; Cryopédologie ; Géographie physique ; Géomorphodynamique ; Périglaciaire ; Sorted circle ; Spitsbergen ; Svalbard ; Zone froide

Comparaison des séries 1957-66 et 1972-82. Mais entre les deux périodes, la densité du réseau d'observation s'est renforcée, et les moyens d'investigation ont été renouvelés (télédétection), de sorte que l'interprétation des différences s'avère

Longitudinal changes in size and sorting of stream beds material in four English Rivers

Observations of sorted patterned ground features, High Valley/Tangle Lakes region, Central Alaska, U.S.A. in Periglacial processes and landforms.
These features have been studied since 1981, and since 1982 sorted circles at six patterned ground sites in High Valley have been monitored to determine their degree of activity.

Pulsations in bedload transport rates induced by a longitudinal sediment sorting : a flume study using sand and gravel mixtures
Laboratory experiments, in which two sized materials were continuously fed into a flume, revealed that a longitudinal sediment sorting produced a rhytmic fluctuation in the bedload transport rates. Bedload pulsation was immediately noticeable
for conditions in which the finer size fraction was poor in the mixture. The longitudinal sediment sorting was also accompanied by aggrading-degrading sequences and/or steep slope-gentle slope events. A descriptive model applicable to some problems in gravel-bed

. Cette bordure faisait partie d'une faille transformante entre Terre-Neuve et le NW de l'Afrique durant la phase initiale d'ouverture de l'océan de sorte que le plancher océanique dans la région du profil a été formé après l'épisode d'évaporites

Settling-velocity distributions and sorting processes on a longitudinal dune : a case study

On sampling and sorting of pebbles and cobbles on shores, a comment on shape development of trondhjemite pebbles and cobbles on shores in the southwestern finnish archipelago, by Mauri Pyokäri (1980)

Longitudinal variations in the size and sorting of bed material along six arid-region mountain streams in Arid and semi-arid environments. Geomorphological and pedological aspects.
The A. uses regression analysis to investigate downstream patterns in mean grain size and sorting of bed material along six small ephemeral streams in a mountain watershed. Mean grain size declines exponentially along four of the six streams
of sorting depends most strongly on the size of the bed material. Local variations in parent material also have significant influences on mean grain size and sorting within some of the streams.

Development of miniature sorted patterned ground following soil erosion in East Falkland, South Atlantic
and indicate that in cool oceanic climates the distribution of frost-sorted patterns is controlled by the presence of bare ground on suitable regolith rather than by altitude.

Kleinformen von Strukturboden in den Hochlagen des Bayerischen Waldes. (Miniature forms of sorted polygons in the upper zones of Bayerischer Wald)
give evidence of their genesis as sorted polygons. The most important aspect is that of the present conditions for the further development and the preservation of these miniature forms. The swelling up of the thixotropic substratum due to humidity

Frost heaving and frost creep on an experimental slope : results for soil structures and sorted stripes in Periglacial processes and landforms.
to be able to transform sorted polygons into sorted stripes along a slope.

). Cette exploitation accélérée des réserves en eaux souterraines a déterminé un abaissement de la nappe phréatique, ce qui a eu une influence sur les cultures et la végétation naturelle, car la surface piézométrique est située entre 1 et 2mètres au-dessous
de la surface du sol, de sorte que la frange capillaire atteint la zone des racines. (RFC).

la sorte se trouve réalisé un croisement entre la méthode synoptique illustrée par P. Pédelaborde et la méthode dite des combinaisons du temps préconisée par A. Hufty. Nombreux exemples empruntés aux régions océaniques de l'Europe occidentale

Data for three representative storm events are described for a small 0.30 km2 erodible semiarid catchment. The mean grain size and sorting of sheetwash sediments were significantly different from fluvial suspended sediment for individual storm
events. Sheetwash sediments were coarser and more poorly sorted than fluvial suspended sediments. Enrichment radios indicated selective erosion and transport of silt and clay, and preferential deposition of sands.

The deposit facies resulted from the sorting of silt during transportation and sedimentation. The farther is the source, the finer is the soil texture. Soil formation processes reflect the zonal climate (zonation) and other natural environmental

reworked by wind. Aeolian deposits were well sorted whereas fluvial deposits were poorly sorted in both size and shape. Although gross-shape characteristics (lower harmonics of Fourier series expansion) indicated a common source rock for all sands

Frost sorted patterned ground: a review

Résultats de la recherche (1949 résultats)