Vistulian and Holocene aeolian activity, pedostratigraphy and relief evolution in Central Poland
Two periods of Vistulian aeolian activity are recognized : 1) Early and Plenivistulian period of aeolian abrasion and 2) Late Vistulian period of aeolian accumulation interrupted by phases of pedogenesis. The Old Holocene period was the period
of soil-forming processes. During the Young Holocene period dune destruction occurred.
Rockfall activity from an alpine cliff during thawing periods
This paper describes observations of rockfall activity in Hosozawa Cirque in the Japanese Alps, from 1984 to 1998. The period includes intensive observations of both rockfalls and rock temperatures for 3 years (1993-1995). Rock debris transported
onto snow surfaces was measured during seasonal thawing periods. Discussion is focused on the mechanism of rockfall generation and controls of the dimension of rockfall debris.
Progression de l'urbanisation en Chine à travers quatre étapes : 1949-57-période d'urbanisation active; 1958-61-période d'urbanisation très rapide; 1962-75-période de contre-urbanisation; de 1976 à nos jours-période d'urbanisation rapide
and volcanic activity at a spreading centre, and the second phase involved a period of off-axis volcanic and tectonic activity.
Consideration of the structure and morphology of the study area as a whole, as well as that of a small constructional volcanic hill suggests that it evolved in two phases. The principal phase of development involved a period of crustal extension
Bedload entrainment, travel lengths, step lengths, rest periods―studied with passive (iron, magnetic) and active (radio) tracer techniques
This paper reports results from bedload transport investigations with active (radio) and passive (iron, magnetic) tracers in the Lainbach, a step-pool mountain river, in Bavaria, Southern Germany.
Short-period velocity fluctuations of two glaciers on Mt. Wrangell, Alaska
The A. presents the results of a study of the short-period motion of two glaciers on Mt Wrangell, Alaska. These glaciers are located on an active volcano and have a common accumulation zone. The study documents distinctive differences in their short
-period motions, as well as some significant differences from short-period motion events described in the literature. Several possible explanations for the differences, including volcanically produced meltwater, are suggested.
Changing conditions of aeolian sand deposition during the last deglaciation period
After the maximum of the last glaciation three main periods of aeolian activity may be distinguished : at the end of the Late Pleniglacial, in the middle of the Late Glacial (Older Dryas) and at the very end of the Late Glacial (latest part
of the Younger Dryas). These three phases and the respective mode of activity as well as the resulting forms and sediments are compared.
Late Holocene aeolian activity in the Cimarron River valley of west-central Oklahoma
activationperiods recorded in ridge dune deposist as well as the spatial variability of aeolian processes during active aeolian episodes. This study shows that aeolian landforms superimposed on fluvial terraces adjacent to the Cimarron River, in southeastern
Major County and northwestern Kingfisher County, are the product of distinct late Holocene climatic conditions, in which periods of dune activity are episodic and accumulation of sediments is relatively rapid.
Relations between slope processes and active-layer thickness 1972-2002, Kapp Linné, Svalbard
Active layer ; Arctic Region ; Climatic variability ; Creep ; Periglacial features ; Permafrost ; Slope ; Slope dynamics ; Solifluction ; Spitsbergen ; Svalbard
Linné for the period 1912 to 2004. The slope processe respond clearly to the deeper active layer. The effect is clearest during the last decade when solifliction and creep rates increased significantly.
attention is paid to the depth of the active layer that has been monitored parallel both at the slope sites and within the International Permafrost Association's CALM (circumpolar active layer monitoring) sites. The macroclimate is covered by data from Kapp
Deux périodes ont été délimitées dans le cycle annuel de circulation de l'eau : l'une passive, comprenant les mois d'hiver, où l'on observe l'accumulation et le gel de l'eau, et l'autre active, de la mi-mai à la mi-octobre, caractérisée par une
circulation accrue de l'eau. La périodeactive comporte deux sous-périodes : la première avec ablation intensive des taches de neige et fonte intentive du gélisol, l'autre postérieure avec ablation lente des taches de neige rémanentes et fonte lente du gélisol
. L'importance de l'écoulement est fonction de la quantité d'eau accumulée dans la couverture de neige durant la période passive d'hiver qui précède la période estivale. - (D. Gazicka).
Short-term planetary-scale interactions over the tropics and midlatitudes during northern winter. Part I. Contrasts between active and inactive periods
Durant les périodes de mousson de NE très actives (surges), les circulations varient de façon cohérente aux latitudes intertropicales et extratropicales. Le jet et la cellule de Hadley sur l'Asie orientale, le flux divergent sur l'Indonésie et les
cellules de Walker du Pacifique équatorial et de l'océan Indien se renforcent, alors que le jet secondaire faiblit sur le Pakistan et l'Afghanistan. Pendant les périodes inactives (breaks), la circulation présente des caractères sensiblement inversés aux
Activité professionnelle ; Belgique ; Chômage ; Emploi ; Femme ; Flexibilité ; Population active ; Travail féminin
Belgium ; Employment ; Female labour ; Flexibility ; Occupational activity ; Unemployment ; Woman ; Working population
L'A. illustre au moyen de 3 tableaux statistiques, couvrant la période 1970-1989 en Belgique, certaines évolutions significatives, comme la croissance des taux d'activité féminine, le déclin de l'emploi industriel, un recours intensif à la
On recent variations of the annual thunderstorm activity in the region of the Alps
Analyse spectrale de variance des jours d'orage, dans les Alpes et les Préalpes. On conclut à l'existence d'ondes de longue et de courte période, mais les fluctuations annuelles de l'activité orageuse semblent fondamentalement instables. (J. P
The indicators applied to follow migrations are changes in the number of commutors, ratio of outcommutors to active earners in residence and ratio of incommutors to active earners working in place. The various periods in migrations are described
Features indicative of prolonged and severe periglacial activity in Ireland, with particular reference to the South-West
Les fentes de gel fossiles sont très largement répandues sur le territoire irlandais mais sont difficiles à dater. On distingue au moins trois phases majeures d'activité périglaciaire durant la dernière période glaciaire.
Seismic activity in Vatnajokull in 1900-1982 with special reference to Skeidaradhlaups, Skaftarhlaups and Vatnajokull eruptions
Les périodes à fortes secousses sismiques coïncident avec une intense activité géothermique dans le secteur à chaudron du nord-ouest du Grimsvotn. (JCB).
A geochronological approach to understanding the role of solar activity on Holocene glacier length variability in the Swiss Alps
The AA. present a radiocarbon data set of wood and peat samples. The radiocarbon dates obtained are not distributed randomly over the period of time sampled, but cluster in defined time windows. The samples document that 8 glaciers in the Central
Alps had a shorter length at several defined periods during the Holocene than in the 1990s. Measured long-term series of glacier length variations show significant correlation with the total solar irradiance.
Seismic activity associated with the 1970 eruption of volcano Hekla in Iceland
L'activité séismique associée à l'éruption de 1970 a surtout été sensible à 3 moments (séparés par des périodes à faible séismicité): d'abord au début de l'éruption, ensuite lors d'une phase ne montrant pas de changement évident dans l'éruption
, enfin à la fin de la période d'activité volcanique. Les tremblements de terre ont été peu profonds et d'origine tectonique. (JCB).