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(Article of periodic en Anglais - 2012)

Document title

Comparison of methods for quantifying active layer dynamics and bedload discharge in armoured gravel-bed rivers

Authors(s) and Affiliation(s)

HOUBRECHTS G. (1) ; VAN CAMPENHOUT J. (1) ; LEVECQ Y. (1) ; HALLOT E. (1) ; PEETERS A. (1) ; PETIT F. (1) ;
(1) Geography, Univ., Liège, BELGIQUE

Abstract

The bedload discharge in the Ardennian rivers (Belgium) has been evaluated by combining data obtained using the scour chains technique and the distance covered by tracers. Quantities of sediment transported during frequent floods are relatively low due to the armour layer which protects the subsurface material. These low values are also related to the fact that the distance calculated for mobilized bedload only applies to tracers fitted with PIT (passive integrated transponder)-tags, whereas part of the bedload discharge is composed of sand and fine gravel transported over greater distances than the pebbles. The break-up of the armour layer was observed only once, for a decennial discharge. In the Lembrée River, the river-bed contains slag elements up to a depth of about 50 cm, indicating that exceptional floods may rework the bed to a considerable depth

Source

Article of periodic

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

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

Millesime : 2012, vol. 37, no14 [pp. 1501-1517]

Bibliographic references : 3 p.

Collation : 6 fig., 4 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3258

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