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Numerical simulation of the impact of sediment supply and streamflow variations on channel grain sizes and Chinook salmon habitat in mountain drainage networks

Auteur(s) et Affiliation(s)

NEUPANE, S.
Dept. of Biosystems and Agricultural Engineering, Oklahoma State Univ., Stillwater, Etats-Unis
Dept. of Civil Engineering, Center for Ecohydraulics Research, Univ. of Idaho, Boise, Etats-Unis
YAGER, E.M.
Dept. of Civil Engineering, Center for Ecohydraulics Research, Univ. of Idaho, Boise, Etats-Unis


Description :
Relatively little is known about hydrograph (shape, peak flow) influence or the relative importance of chronic and episodic hillslope inputs on channel conditions. To better understand these external drivers, the AA. calculated sediment routing through a gravel-bedded river network using a one-dimensional (1D) bedload transport model. The study site, Buckhorn Creek is located in central Idaho. They calculated changes in grain sizes and estimated Chinook salmon habitat suitability caused by a dry year and an extreme flood hydrograph, and chronic (diffusive, overland flow) or pulse (landslide, debris flow) hillslope sediment supplies. It is shown that depending on the magnitudes of flow hydrograph and sediment supply alterations, climate change may induce no differences in grain sizes or very dramatic changes with significant consequences for long-term sustainability.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2013, vol. 38, n°. 15, p. 1822-1837, nombre de pages : 16, Références bibliographiques : 3 p.

Date :
2013

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

Langue :
Anglais
Droits :
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