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PORTAIL D'INFORMATION GÉOGRAPHIQUE

Measuring gravel transport and dispersion in a mountain river using passive radio tracers

Auteur(s) et Affiliation(s)

BRADLEY, D.N.
Geomorphology and Sediment Transport Lab., US Geological Survey, Golden, Etats-Unis
TUCKER, G.E.
CIRES and The Dept. of Geological Sciences, Univ. of Colorado, Boulder, Etats-Unis


Description :
This paper describes results from a large tracer experiment designed to test stochastic transport models. The AA. used passive integrated transponder (PIT) tags to label 893 coarse gravel clasts and placed them in Halfmoon Creek, a small alpine stream near Leadville, Colorado, USA. The PIT tags allow to locate and identify tracers without picking them up or digging them out of the streambed. They also enable to find a very high percentage of the rocks, 98% after 3 years and 96% after the 4th year. The AA. use the annual tracer displacement to test 2 stochastic transport models, the Einstein-Hubbell-Sayre (EHS) model and the Yang-Sayre gamma-exponential model (GEM). They find that the GEM is a better fit to the observations, particularly for slower moving tracers.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2012, vol. 37, n°. 10, p. 1034-1045, nombre de pages : 12, Références bibliographiques : 1 p.

Date :
2012

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

Langue :
Anglais
Droits :
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