Coarse bed material patch evolution in low-order, ephemeral channels

Auteur(s) et Affiliation(s)

YUILL, B.

Pontchartrain Inst. for Environmental Science, Univ., New Orleans, Etats-Unis

NICHOLS, M.

USDA-ARS SWRC, Tucson, Etats-Unis

YAGER, E.

Dep. of Civil Engineering, Center for Ecohydraulics Resaerch, Univ. of Idaho, Boise, Etats-Unis

Description :
This paper documents the evolution of coarse bed material in Lucky Hills, a low-ordered, ephemeral watershed in southeast Arizona. The bed material is arranged in discrete patches that are differentiated from one another by their grain-size distributions. Measurements of patch size (patch surface area) and composition (GSD) are recorded for a sample of coarse material patches throughout the study period, 2005-2006. The variability of patch size and GSD through time is used as a gauge of patch stability. These measures of patch stability are then correlated to values of predicted grain mobility. Results indicate that relative stability varies from patch to patch, influenced by the balance of patch grains transported out of the patch and the deposition of new grains into the patch.

Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2010, vol. 81, n°. 2, p. 126-136, nombre de pages : 11, Références bibliographiques : 1 p.

Date :
2010

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena

Langue :
Anglais