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(Article of periodic en Anglais - 2013)

Document title

Evaluating channel response to an extreme sedimentation event in the context of historical range of variability : Upper Colorado River, USA

Authors(s) and Affiliation(s)

RATHBURN S.I. (1) ; RUBIN Z.K. (1) ; WOHL E.E. (1) ;
(1) Dep. of Geosciences, Colorado State Univ., Fort Collins, ETATS-UNIS

Abstract

In May 2003, a breach in a large irrigation ditch within Rocky Mountain National Park (RMNP) initiated a debris flow that entered Lulu Creek and the Colorado River, where 36 000 m3 of sediment substantially altered channel forms and processes. The AA. present a proof of concept to understand whether the 2003 disturbance is within the historical range of variability (HRV), and whether the recovery potential of the system is sufficient to adapt to the disturbance. Flow and sediment regimes, and channel morphology and stability were monitored on Lulu Creek and the Colorado River from 2004 to 2011. Dominant channel response following the debris flow within Lulu Creek included step development, bed armoring, and channel widening. Lulu Creek is returning to a condition of natural variability, but the Colorado River is outside the HRV expected for steep-gradient, pool-riffle channels. Applying HRV to a situation where management questions require a longer term perspective, and pre-disturbance baseline data are limited, is a useful approach

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2013, vol. 38, no4 [pp. 391-406]

Bibliographic references : 2 p.

Collation : 13 fig., 3 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3329

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2013
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