Mots-clés
Arroyo Cours d'eau Cours d'eau intermittent Couverture végétale Cône de déjection Domaine semi-aride Dynamique fluviale Erosion fluviatile Etats-Unis Etats-Unis du Sud Géométrie hydraulique Lithologie Niveau de base Utilisation du sol Variation climatique Alluvial cone Base level Channel geometry Climatic variation Fluvial dynamics Fluvial erosion Land use Lithology Plant cover Semi-arid area Southern United States Stream United States of AmericaDiscontinuous ephemeral streams
Special Issue. Geomorphic responses to short-term climatic change
Auteur(s) et Affiliation(s)
BULL, W.B.
Geosciences Dep., Univ. Arizona, Tucson, Etats-Unis
KOCHEL, R.C.
Dep. Geology, Indiana Univ.-Purdue Univ., Indianapolis, Etats-Unis
Description :
Many ephemeral streams in western North America flowed over smooth valley floors before transformation from shallow discontinuous channels into deep arroyos. These inherently unstable streams of semiarid regions are sensitive to short-term climatic changes, and to human impacts, because hillslopes supply abundant sediment to infrequent large streamflow events. Discontinuous ephemeral streams appear to be constantly changing as they alternate between 2 primary modes; either aggradation or degradation may become dominant. Attainment of equilibrium conditions is brief.
Type de document :
Congrès
Source :
Symposium du Congrès International de Géomorphologie, 3, Hamilton, Canada, 1993, Geomorphology (Amsterdam), issn : 0169-555X, 1997, vol. 19, n°. 3-4, p. 227-276, Collation : Illustration, Références bibliographiques : 3 p.
Date :
1997
Editeur :
Pays édition : Pays-Bas, Amsterdam, Elsevier
Langue :
Anglais
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)