Die Dünen im VictoriaValley, Victoria-Land, Antarktis. Ein Beitrag zur äolischen Formung im extrem kalten Klima (Les dunes dans la VictoriaValley, Victoria land Antarctique. Essai sur le modelé éolien sous climat polaire)
Accumulation éolienne ; Action éolienne ; Antarctique ; Climat polaire ; Dune ; Eolien ; Géographie des régions polaires ; Modelé éolien ; Victoria land ; Victoriavalley ; Zone froide
The special conditions for eolian processes forming dunes in extreme polar regions are discussed in comparison to other climatic zones. Dune forms in the VictoriaValley are described and their origin studied by measuring procedures in the field
Griffith Taylor's palimpsest theory of the Dry Valleys of Victoria Land, Antarctica
Griffith Taylor was the first geomorphologist to work in the Dry Valleys of southern Victoria Land, Antarctica. He proposed a multistage model in which earlier cirque erosion was later swamped by expanding outlet glaciers. Subsequently
these glaciers retreated leaving the present form of the valleys. The topography retained the imprint of each episode, hence his name palimpsest theory. The A. summarises later research and compares Taylor's theory with current views.
Australie ; Basalte ; Coulée de lave ; Datation ; Géographie de l'Océanie ; Géomorphogenèse ; Météorisation ; Réseau de drainage ; Victoria ; Volcanisme
Mt Rouse, an exctint volcano south of Penshurst in W. Victoria was a source for copious lava flows which followed pre-existing valleys and reached the coast 60 km to the south. Many typical features of drainage modifications are associated
Meteorological controls on sand transport and dune morphology in a polar-desert : VictoriaValley, Antarctica
Antarctique ; Barkhane ; Changement climatique ; Circulation atmosphérique ; Dry Valleys ; Dune ; Désert ; Eolien ; Périglaciaire ; Région polaire ; Transport éolien ; Zone froide
Meteorological controls on sand transport and changes in dune morphology were monitored for 11 days in November-December 2004 on a barchan dune in the VictoriaValley, McMurdo Dry Valleys. Sand transport in this environment was found
southwesterly winds were found to promote aeolian processes by dislodging surface sediments, with dune morphology responding rapidly. As a result, change in the morphology of the dunes of the VictoriaValley may provide an early indication of change in regional
to be influenced by, 1) interparticle cohesion (ice-bonding); 2) diurnal variations in the speed of thermally driven easterly valley winds due to reduce solar heating by night; and 3) topographically modified foehn southwesterly winds. Warm, dry and gusty foehn
Long-term rates of denudation in the Dry Valleys, Transantarctic Mountains, southern Victoria Land, Antarctica based on in-situ-produced cosmogenic 21Ne
Concentrations of cosmogenic 21Ne measured in quartz have been used to estimate long-term rates of denudation for contrasting landscape components in the Dry Valleys area. Samples of Beacon Supergroup sandstones and granitic basement were collected
with the preservation of volcanic deposits dating back to the mid-Miocene, these 21Ne data demonstrate that only minimal modification of the landscape has occurred in the Dry Valleys over at least the past 15 Ma.
Limited pliocene glacier extent and surface uplift in middle Taylor Valley, Antarctica
The purpose of this paper is to assess the degree of stability/instability of the East Antarctic Ice Sheet during the Pliocene by dating and mapping surficial deposits in middle Taylor Valley in the Dry Valleys region of southern Victoria Land.
Australie ; Capacité de charge ; Cours d'eau ; Crue ; Eau souterraine ; Grotte ; Karst ; Méandre ; Nappe phréatique ; Niveau de base ; Profil longitudinal ; Roche carbonatée ; Rupture de pente ; Victoria
Australia ; Base level ; Carbonate rock ; Carrying capacity ; Cave ; Flood ; Groundwater ; Karst ; Longitudinal section ; Meander ; Phreatic ground water ; Stream ; Victoria
Valley. This area therefore offers an ideal opportunity to explore the interactions between cave development and nickpoint migration, and also gives insights into the possible limits to the rate of subsurface nickpoint migration.
[b1] University of Melbourne, Dept. of Geography and Environmental Studies, Parkville, Victoria, Australie
Permafrost thermal regime from two 30-m deep boreholes in Southern Victoria Land, Antarctica
Antarctique ; Changement climatique ; Mollisol ; Pergélisol ; Régime thermique ; Région polaire ; Température ; Température de l'air ; Température du sol ; Victoria Land ; Zone froide
Two 30-m deep permafrost temperature-monitoring boreholes were installed in bedrock, one at Marble Point and one in the Wright Valley, in the Ross Sea region of Antarctica. A soil climate-monitoring station in till is located near each borehole
. The main aims of this paper are: (1) to describe the permafrost temperatures and active-layer thermal regime at these two sites in southern Victoria Land; and (2) to derive a climate change record over the last 10 years from the permafrost borehole
The AA. focus on a dry-based lake, i.e. frozen to the bottom, of the Dry Valleys of South Victoria Land to study how sediment becomes trapped in the lake ice. The study is based on data obtained not only from sedimentological investigations but also
The objective of this study was to determine whether the dry-based glaciers of the Dry Valleys of southern Victoria Land, Antarctica, form a land system and sediment association that is different from the other thermal types. This paper examines
and interprets the ice marginal sediments and landforms of several glaciers in the Taylor and Wright valleys. The principal characteristics of the ice marginal landforms and sediments are compared and contrasted with the existing facies model for arid polar
Antiphasing between rainfall in Africa's rift valley and North America's Great Basin
abrupt warming. At about this time, a major change in the pattern of global rainfall occured. Lake Victoria was rejuvenated, the Red Sea freshened and Lake Lahontan dessicated. For the AA., the onset of the Bølling-Allerød warm interval appears to have
Entwicklungsprobleme des New Valley, Agyptische Sahara. (Development problems of the New Valley, Egyptian Sahara
(1967-1978) ; Colonisation agricole ; Egypte ; Géographie de l'Afrique ; New Valley Project ; New Valley, rég. ; Peuplement ; Politique agricole
Mise en oeuvre du projet de colonisation agricole et de peuplement de la New Valley, depuis le rapport fait par Schamp en 1967 plus particulièrement. (HSC).
The origin of certain wide valleys in the Canary Islands
Canary Islands ; Geomorphology ; Inverted relief ; Lava flow ; Model ; Valley ; Volcanism
The present work addresses a long-term controversy concerning the origin of Orotava Valley, one of the most peculiar valleys in the Island of Tenerife. Analysis of the key features of Orotava Valley leads to formulation of an hypothesis which could
be applicable to numerous volcanic areas. Such valleys are developed as volcanic valleys undergo lateral expansion due to repeated alternations of processes: initial erosion of the gorges by streams, the burial of the gorges by lava flows, and the inversion
of the relief by erosion at the base of valley walls.
The post to late glacial valley reconstruction on the Haramosh north side (Mani, Baska and Phuparash valleys)
Asia ; Glacial features ; Glacial valley ; Karokoram ; Lateral moraine ; Palaeo-environment ; Postglacial
The history of the landscape of the Haramosh valley is linked with the former glaciation history of the Indus Valley. The extent of the former glaciers Mani, Baska and Phuparash according to their glacio-geomorphic position, their snow line
depression and relative age classification, using the method of Kuhle, is reported in this article. A high glacial ice filling of the Haramosh valley and glacial erosion of the flat top of the Darchan ridge as an intermediate valley head is strongly probable.
A rational explanation of cross-profile morphology for glacial valleys and of glacial valley development
The purpose of this paper is, first to present an explanation of the cross-profile morphology based on the physical process of glacier flow and second to interpret development of the glacial valley cross-profile.
A rational explanation of cross-profile morphology for glacial valleys and of glacial valley development : a further note
The AA. discovered a misinterpretation in their original paper entitled : a rational explanation of cross-profile morphology for glacial valleys and of glacial valley development in earth surface processes and landforms, vol. 13, No 8, p. 707-716
Outlines of the late Quaternary history of the Drentsche Aa Valley (Drente, The Neteherlands)
An outline is given of the geomorphology and Late Quaternary history of the Drentsche Aa valley. The valley sediments are subdivided in fluvial, slope and aeolian sediments on lithological arguments. The vertical succession of the river valley
sediments demonstrates a decreasing fluvial activity during the Weichselian. Tentatively four erosion phases are distinguished in the valley system.
This paper aims to explore the process-landform relationships and potential genetic links between duricrust formation and Kalahari valley development, and hence assess the possible influence and implications of groundwater weathering and erosion
upon duricrusts. This is achieved by consideration of relationships between valleys and duricrusts at a variety of scales (ranging between microscale to valley scale) from three mekgacha systems within the Kalahari: the Rooibrak and Letlhakeng valleys