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Portail d'information géographique

Résultats de la recherche (7 résultats)

The origin of certain wide valleys in the Canary Islands

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
1994

Postglacial recession of Niagara Falls in relation to the Great Lakes

The recessional history of Niagara Falls in the present Niagara Gorge during the postglacial period has been a focus of study throughout this century. Alternative interpretations have been proposed. Discussion of new radiocarbon ages of clam shells.
1994

Fluvialism or diluvialism? Changing views on superfloods and landscape change

features, including diverted drainage drainage systems, gorges, valleys meanders and extensive sheets of gravel might have been created by these superfloods. This article explores the nature of neodiluvialism. It also discusses landscape features which can
1994

Morphogenetic problems of the upper Huang He drainage basin

The combination of meanders, deep gorges, and transverse cuttings is considered as the main geomorphic feature of the upper Huang He. The belonging landforms reveal remnants of former landsurfaces which appear as plateau flats, summit levels
1994

Circulation and representativeness of precipitation and air temperature in the Southeast of the Quinghai-Xizang Plateau

Based on time series of 98 stations from the Qinghai-Xizang Plateau, the Indo-Gagnetic Plains, the River Gorge Country and Eastern China, the representativeness of the locally observed interannual variations of temperature and precipitation
1994

Guelta Tamda (Moyen Atlas plissé, Maroc) : un exemple de lac de barrage naturel

Guelta Tamda est située au Moyen Atlas oriental, au pied méridional de jbel Nerkibat. Emprisonné entre les parois verticales des gorges de l'oued Ighrane, ce lac est en réalité, un barrage naturel installé dans une vallée disséquée puis obstruée par
1994

Skizzierung eigener Beiträge zur Relief- und Paläoklimaforschung in einem afrikanischen Trockenraum - Namibia

importants, il a réagi de façon sensible aux variations climatiques. Cela est montré grâce à l'exemple de l'étage éolien et du relief de gorge désertique du Namib. Dans le relief du Koma, dans le haut-pays, les analyses de relief correspondantes sont moins
1994