This paper concerns with the morphometry of the flood plains. Against the general conception that a flood plain widens from upstream to downstream, the AA. point out that, at least in the Moldavian Tableland, the width of a flood plain increases
only together with the increase of Strahler order; moreover, between two successive confluence of the same or of close orders, a flood plain narrows from upstream to downstream, being regenerated by a new confluence. This tendance is a general rule
in the Moldavian Tableland, and seems to have a large extension in the Romanian flood plains. - (E. Rusu).
Fait le point des connaissances sur la plaine argileuse du Soudan central. Les argiles, dérivées d'événements tectoniques ou fluviatiles ont été retenues par une topographie qui s'y prêtait et les circonstances climatiques. L'histoire
The response of fluvial systems to climate change : an example from the central Great Plains
The A. uses a late Holocene alluvial chronology from a reach of the Republican River, south-central Nebraska, the published late Holocene alluvial record from the central Great Plains, and the paleoclimatic record of the region to discuss
Clay minerals in soils as evidence of Holocene climatic change, Central Indo-Gangetic Plains, North-Central India
This study presents results and the interpretation of clay mineral assemblages in the relict soils of the central part of the plain between the Ramganga and Rapti rivers, and also describes another possible tool for paleoclimatic studies
of Quaternary deposits of the Indo-Gangetic Plains.
The transformation of the agrarian structure of Central Thailand, (1960-1980)
Agriculture commerciale ; Capitalisme ; Contrat de culture ; Culture vivrière ; Géographie de l'Asie ; Plaine ; Structure agraire ; Thaïlande ; Utilisation du sol
Au début des années soixante la structure agraire de la plainecentrale a commencé à se transformer. La culture vivrière du riz a diminué au profit des cultures commerciales. Les jeunes ruraux émigrent vers Bangkok et la plainecentrale dépend des
marchés mondiaux. Le capital étranger joue un rôle croissant dans les contrats de culture. L'évolution de la Thaïlande sera fonction des solutions apportées aux problèmes politico-sociaux de la plainecentrale. (GL).
Evaluation de l'état des pâturages de plaine des steppes sèches de Mongolie centrale et définition d'indicateurs des processus actuels entraînant leur digression.
Symétrie dans la structure du tracé des principaux cours d'eau des plaines russe, de Sibérie occidentale et des plateaux de Sibérie centrale. Lignes de partage des eaux, noeuds hydrographiques et orographiques des grandes plaines d'Eurasie
. Principaux traits du tracé du réseau hydrographique des grandes plaines euro-asiatiques.
La plaine alluviale supérieure résulte avant tout d'un faciès de croissance verticale, tandis que dans la plaine alluviale inférieure dominent des sédiments mis en place par déplacement latéral. La plaine alluviale supérieure s'est formée par des
inondations qui ont eu lieu au cours des 4, 5 derniers siècles ou plus. La haute plaine alluviale est aujourd'hui à l'abri des hautes crues habituelles mais pas des crues exceptionnelles.
Sur l'exemple de plaines de montagnes et de piémonts d'Asie centrale et du Caucase central, on montre la relation entre les charges en suspension des cours d'eau de plaines montagneuses, la composition de riches humus soumis à une érosion, les
éléments biophiles des sols de montagnes et la composition des pédolithosédiments alluviaux-proluviaux dans les domaines de la charge solide sur les plaines de piémonts.
of the Peoria Loess on the Great Plains is nonglaciogenic. Peoria Loess deposition on the central Great plains was largely a direct response to climatic change in the unglaciated source region.
In the midwestern United States, large rivers draining the Laurentide Ice Sheet (LIS) were the most important sources of Peoria Loess, deposited during the last glaciation. In contrast, it has been proposed that thick Peoria Loess on the central
Great Plains was derived mainly from unglaciated landscapes northwest of the main loess deposits. In this study, transport directions inferred from more than 600 measurements of Peoria Loess thickness in Nebraska are used to test the hypothesis that much
This paper explains the detection of slackwater deposits within a humid climatic setting and use of these deposits in paleoflood reconstruction. Assessing the flood frequency distribution of rare floods in the south-central Great Plains
Downstream changes in dryland river channels : the Northern Plains of arid central Australia
This paper examines downstream channel changes along moderate to large (up to 300 km long) rivers which drain the Northern Plains of arid central Australia. It aims to document downstream changes in channel morphology; to relate these downstream
changes to likely controlling factors; and to compare the downstream changes along the Northern Plain rivers with trends shown by other dryland rivers.
Alluvial soil chronosequence in the inner coastal plain, Central Virginia
The purpose of this study was to document the chronological sequence of soils present on an extensive series of terrace deposits found along the James River in the Fall Zone of central Virginia. Some of the oldest soils and landforms in the Virginia
Coastal Plain are present here, along with fluvial terraces that correlate with coastal terraces farther east. The AA. clarify soil-geomorphic relations and provide a basis for allostratigraphic subdivision of the inner Coastal Plain.
Late Holocene alluvial chronology and climate change in the central Great Plains
Amérique du Nord ; Datation C 14 ; Fluviatile ; Great Plains ; Géochronologie ; Holocène ; Quaternaire ; Stratigraphie ; Variation climatique
General synchrony between late Holocene fluvial chronologies of the central Great Plains suggests climatic control of fluvial activity. The episodes of incision are tentatively correlated with different climate regimes, illustrating the difficulty
Tropical/subtropical inner ramp facies in Lower Miocene Calcari a Briozoi e Litotamni of the Monte Lungo Area (Cassino Plain, Central Apennines, Italy)
This paper investigates the Lower Miocene carbonate succession outcropping in the Monte Lungo Area (Cassino plain, Central Apennines). The Cassino plain is located in the southern sector of a wide neritic domain known as Latium-Abruzzi platform. Two