Results of a preliminary test for fractal characteristics in the digitized boundaries of several mapped drainage basins : six relatively small basins in southern Indiana and six larger U.S. basins. The method employed is automated Richardson
Mictomys borealis (Northern Bog Lemming) and the Wisconsin paleoecology of the east-central Great Basin
Amérique du Nord ; Biogéographie ; Great Basin ; Paléo-environnement ; Pléistocène ; Quaternaire ; Wisconsinien
Biogeography ; Great Basin ; North America ; Paleo-environment ; Pleistocene ; Quaternary ; Wisconsinan
In this paper, the AA. report the first record of M. borealis from Wisconsin Glacial age deposits in the Great Basin, discuss its biogeographic and paleoecologic significance, and review the paleoenvironments of the east-central Great Basin.
The spatial organization and scaling properties of a number of physical variables in river basins are analyzed within the framework of the multifractal formalism using data from digital elevation maps. The analysis of nine very different basins
in the United States shows that the multifractal spectra for each of the variables are very similar across basins, revealing a common structure of organization. This structure is compared to networks generated with Scheidegger's stochastic model of river basins
Les AA. présentent un programme d'analyse minéralogique basé sur la diffractométrie. Cette étude porte sur des sédiments alluviaux (limons) de l'Holocène et du Pléistocène, à l'intérieur du bassin-versant du Voidomatis.―(A. Peyre).
The preglacial landscape configuration in the Sognefjord drainage basin of western Norway is reconstructed, and the total Quaternary erosion is quantitatively determined to 7 610 km3 by subtracting the present topography from the reconstructed
Streamflow and sediment transport from mountain watersheds of the Chao Phraya basin, northern Thailand : a reconnaissance study
Bassin-versant ; Hydrologie ; Montagne ; Ruissellement ; Thaïlande ; Transport sédimentaire ; Utilisation du sol
The A. disputes the hypothesis that land-use practices have altered the hydrologic regime of these basins or have contributed to an increased sediment load in the rivers. - (DWG)
Etablissement d'un modèle hydrodynamique de l'écoulement. Description des caractéristiques bathygraphiques des micro-bassins-versants. Données concernant la Sibérie.
The objectives of this study are to acquire and analyze satellite microwave data over the upper Colorado river basin and further to relate these data to snowpack characteristics, especially, snow water equivalent data. The specific task here
is to see whether similar microwave-snow water equivalent relationships could be derived for a heterogeneous mountain basin.
The AA. investigate the hydrological and geochemical characteristics of the Jamari and Jiparana river basins (Amazonia), during the period 1978-1984. In order to detect the long term influence of the large scale deforestation on the ecosystem
they first characterize the hydrological behavior of the drainage basins and its relationship with the particulate and dissolved river loads in this region.
le bassin mexicain. Les deux bassins abyssaux ont été formés par des affaissements de courte durée. Ils sont installés dans des zones de récente consolidation du socle.
Relationships between the morphometry of alpine and subalpine basins and remotely sensed estimates of lake turbidity, Glacier National Park, Montana
Analyse des groupes ; Analyse en composantes principales ; Bassin-versant ; Corrélation ; Etats-Unis ; Glaciaire ; Géomorphométrie ; LANDSAT ; Lac glaciaire ; Montana ; Réseau de drainage ; Statistique ; Thematic Mapper ; Turbidité ; Télédétection
Relationships between characteristics of alpine and subalpine drainage basin form and estimates of lake turbidity were examined. Remote sensing techniques were developed to assess lake turbidity levels through the acquisition of spectral responses
by the Landsat Thematic Mapper. A significant correlation between the first principal component, which accounted for the general morphometric character of basins, and estimated lake turbidity was discovered. The areal extent of glacial ice and total stream length
within the basins were the most significant variables related to estimated levels of lake turbidity.
Les cours d'eau intermittents constituent une part importante des ressources hydrologiques totales dans les régions arides et semi-arides. Les AA. effectuent une étude géomorphométrique de 61 portions du bassin fluvial du cours du Segura (Sud-Est de
Remote sensing of atmosphere-cryosphere interactions in the Polar Basin
Etudie à l'aide de la télédétection la nature des interactions cryosphère-atmosphère dans le Bassin polaire et contribue à la compréhension de la variabilité et du changement de climat.―(L. Dion).
Bassin-versant ; Bilan hydrologique ; Cuba ; Erosion chimique ; Karst ; Précipitation ; Zone intertropicale
This paper presents results of geomorphological and hydrological investigations carried on in selected catchments basins of western Cuba. They represent two types of the tropical karst : classical upland karst of the Sierra de los Organos (catchment
basin of the Cuyaguateje river) and an isolated limestone massif of the Pan de Guajaibon. The values of contemporary chemical denudation being the coefficient of geomorphological activity, have been calculated in several catchment basins.
L'objet de cette étude est de quantifier l'érosion des sols dans l'aire de drainage la plus importante du bassin; de déterminer le volume de sédiments retenus dans les réservoirs; et d'évaluer les effets de l'accumulation sédimentaire sur le système
Erosion rates in badlands areas of the Central Ebro Basin (NE-Spain)
Badland ; Bassin-versant ; Bilan d'érosion ; Cours d'eau ; Ebro ; Erosion des sols ; Espagne ; Mesure de terrain ; Ravinement ; Rigole ; Topographie
Une estimation du taux d'érosion a été effectuée dans deux régions de badlands du Bassin de l'Ebre (« El Barranco » et « La Charca »), en utilisant des techniques de mesures directes.
Cal Parisa basin (eastern Spain), was selected as a representative of extensive areas on clayey bedrock formerly used for farming, nowadays almost abandoned, where badlands are of great importance as far as sediment production is concerned.
L'érosion de bassins-versants. Analyse et prévision selon les modèles
Bassin-versant ; Erosion des sols ; Modèle ; Prévision ; Ravinement ; Ruissellement ; Sol cultivé
Explication des principes de base du modèle Es qui représente la susceptibilité à l'érosion de bassins-versants et ses applications au ravinement y compris les badlands, et au système rigoles-interrigoles qui érode le plus souvent des terres