Controls on at-a-station hydraulic geometry in steep headwater streams, Colorado, USA

Auteur(s) et Affiliation(s)

DAVID, G.C.L.

Dep. of Geosciences, Colorado State Univ., Fort Collins, Etats-Unis

WOHL, E.

Dep. of Geosciences, Colorado State Univ., Fort Collins, Etats-Unis

YOCHUM, S.E.

Dep. of Civil and Environmental Engineering, Colorado State Univ., Fort Collins, Etats-Unis

BLEDSOE, B.P.

Dep. of Civil and Environmental Engineering, Colorado State Univ., Fort Collins, Etats-Unis

Description :
Detailed hydraulic measurements were made in nine step-pool, five cascade and one plane-bed reach in Fraser Experimental Forest, Colorado to better understand at-a-station hydraulic geometry (AHG) relations in these channel types. A principal component analysis (PCA) was used to compare the combined variations in all three exponents against five potential control variables: wood, D84, grain-size distribution (σ), coefficient of variation of pool volume, average roughness-area (projected wetted area) and bed gradient. The gradient and average roughness-area were found to be significantly related to the PCA axis scores, indicating that both driving and resisting forces influence the rates of change of velocity, depth and width with discharge.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2010, vol. 35, n°. 15, p. 1820-1837, nombre de pages : 18, Références bibliographiques : 68 ref.

Date :
2010

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais