Mots-clés
Ajustement fluvial ; Blue River ; Capacité de charge ; Cours d'eau ; Débit ; Espace-temps ; Etats-Unis ; Géométrie hydraulique ; Régime hydrologique ; WisconsinCarrying capacity ; Channel geometry ; Discharge ; Fluvial adjustment ; Hydrological regime ; Space time ; Stream ; United States of America ; WisconsinCapacidad de carga ; Caudal ; Corriente de agua ; Espacio-tiempo ; Estados Unidos ; Geometria hidráulica ; Régimen hidrológicoStream power, channel change, and channel geometry in the Blue River, Wisconsin
Changing fluvial systems
Auteur(s) et Affiliation(s)
LECCE, S.A.
Dept. of Geography, Planning and Environment, East Carolina Univ., Greenville, Etats-Unis
MOSSA, J.
Dept. of Geography, Univ. of Florida, Gainesville, Etats-Unis
JAMES, L.A.
Dept. of Geography, Univ. of South Carolina, Columbia, Etats-Unis
Description :
This study examines spatial and temporal changes in channel geometry and stream power in a moderate-sized watershed in the Driftless Area of Wisconsin, USA. Pre-settlement (~1830) channel geometry and stream power estimates derived from General Land Office survey notes were compared with conditions obtained from modern field surveys. Comparison of pre-settlement and modern channels shows that channel width and cross-sectional area have increased considerably during the post-settlement period, producing on average a threefold increase in cross-sectional stream power. When compared to discharge, slope, and bank sediment variables, cross-sectional stream power is more strongly associated with channel shape, explaining a maximum of 47% of the variance in one of the four study reaches. These results are compared with a reanalysis of previously published data from the midwestern USA, in which cross-sectional power also explains more of the variance in channel shape than discharge or bank sediment.
Type de document :
Article de monographie
Source :
Physical geography, issn : 0272-3646, 2013, vol. 34, n°. 4-5, p. 293-314, nombre de pages : 22, Références bibliographiques : 3 p.
Date :
2013
Editeur :
Pays édition : Royaume-Uni, Abingdon, Taylor and Francis
Langue :
Anglais
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)