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
Sediment budgeting : a case study in the Katiorin drainage basin, Kenya
Bassin-versant ; Bilan sédimentaire ; Domaine semi-aride ; Erosion des sols ; Géographie de l'Afrique ; Katiorin bassin ; Kenya ; Transport sédimentaire ; Zone intertropicale
The primary objective of the present study is to compute a detailed sediment budget for a semiarid tropical drainage basin. This requires the recognition and quantification of the dominant process operating within the basin, and the identification
Action anthropique ; Bassin-versant ; Biogéochimie ; Brésil ; Cours d'eau ; Déforestation ; Ecosystème ; Géographie physique ; Randônia ; Rio Madeira ; Transport sédimentaire
The AA. develop an overall view of the biogeochemical behavior of the Madeira river drainage basin, in Rondonia state. Some parameters discussed here show a possible anthropogenic influence on the region, as for instance the level of ion
concentration present in water from the Jaru and Jiparana basins and the highest deforestation rate occurring in these basins.
Petit bassin-versant comme système hiérarchique. Cadres spatio-temporels. Processus se déroulant dans les petits bassins-versants. Causes de formation, de fonctionnement et d'évolution des petits bassins-versants. Système des méthodes d'étude des
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.
L'Oxfordien supérieur et le Kimméridgien des Charentes (Bassin aquitain) et du Berry (Bassin parisien). Extension géographique des repères ammonitiques
L'étude permet la corrélation précise des termes de faciès et fait apparaître une similitude dans l'évolution séquentielle de la sédimentation nord-aquitaine et du bassin de Paris.
Mammal Biochronology, UBSU and paleoenvironment evolution in a post-collisional basin : evidence from the Late Miocene Baccinello-Cinigiano basin in southern Tuscany, Italy
This paper reports the results of field studies on the Late Miocene Baccinello-Cinigiano Basin (Southern Tuscany, Italy). Sedimentological and paleontological analysis of the fossil vertebrate-bearing deposits provided a detailed picture
of the basin fill evolution. The deposits consist of gravels, sands and clays formedin several environments ranging from alluvial to fluvial and lacustrine. - (NF)
L'hypothèse d'une unité hydrologiquement homogène est une question fondamentale pour le choix d'un bassin-versant représentatif (expérimental). Les relations entre morphométrie d'un bassin-versant et réponses hydrologiques montrent que l'on peut
identifier des bassins semblables hydrologiquement à partir de mesures de leurs formes. Une classification morphologique multi-dimensionnelle est proposée comme base rationnelle du choix de bassins-versants représentatifs. Application au Sud-Est du Nigeria.
Different parameters of basin morphometry: elevation, size, shape and slope were compared, using correlation analysis, to selected optimal indices for modelling hydrological processes. Five from these indices were estimated independently
, the remaining result from them. The close correlation exists between most of interrelated indices. To describe basin elevation, index of median basin elevation is proposed, however other simple indices, calculated from extreme elevations only, can be used
. Maximum basin length is a better estimator of absolute basin size than basin area. The best index to characterize mean basin slope is Strahler's relief ratio. It can be treated also as the most complex parameter of basin relief. (d'après l'A.).
Reservoirs alter monthly and annual discharge quantities in the Sacramento River Basin of northern California and this practice obscures the natural variability of river discharge. - (DWG)
In this note, the AA. discuss the chronology of single leaf pinyon remains from Danger Cave, western Bonneville Basin, and their biogeographical implications.