Article (Scientific journals)
Evaluation of long-term bedload virtual velocity in gravel-bed rivers (Ardenne, Belgium)
Houbrechts, Geoffrey; Levecq, Yannick; Peeters, Alexandre et al.
2015In Geomorphology, 251, p. 6-19
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Keywords :
bed material transfer; Virtual velocity; Tracer particles; PIT-Tags; iron slag; Excess specific stream power; River restoration; Medium-sized gravel-bed river
Abstract :
[en] In many gravel-bed rivers, bed material transfer has been interrupted or perturbed by anthropogenic activities. Currently, restoration projects are being conducted in many countries in order to re-establish bedload continuity. However, until now, few studies have provided indications of the velocity of bed material over the long-term (at least decade to century time-scale). In the context of river restoration projects (e.g. weir removal, addition of spawning gravel), these data are nevertheless crucial to predict the downstream propagation of the geomorphological and biological benefits (e.g. supply-transport equilibrium, morphological and substratum diversity). In our study, PIT-tag tracers were used in eight medium-sized gravel-bed rivers (Ardenne Region, Belgium) to propose a flow competence relationship based on specific stream power, on the one hand, and to determine the long-term virtual velocity of the bed material corresponding to the median diameter (D50) of the surface layer of riffles, on the other hand. After each flow event that exceeded the threshold for sediment entrainment, tagged particles were sought and located, even when they were buried in the subsurface layer. Afterwards, all of the data were used to estimate the virtual velocity of the bed material over the long-term using three approaches. Finally, the results were compared with long-term transport estimations based on iron slag dispersed by the rivers since the end of the middle ages.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Houbrechts, Geoffrey  ;  Université de Liège > Département de géographie > Département de géographie
Levecq, Yannick
Peeters, Alexandre  ;  Université de Liège > Département de géographie > Hydrographie et géomorphologie fluviatile
Hallot, Eric ;  Université de Liège > Département de géographie > Hydrographie et géomorphologie fluviatile
Van Campenhout, Jean  ;  Université de Liège > Département de géographie > Hydrographie et géomorphologie fluviatile
Denis, Anne-Cécile ;  Université de Liège > Département de géographie > Hydrographie et géomorphologie fluviatile
Petit, François  ;  Université de Liège > Département de géographie > Hydrographie et géomorphologie fluviatile
Language :
English
Title :
Evaluation of long-term bedload virtual velocity in gravel-bed rivers (Ardenne, Belgium)
Publication date :
2015
Journal title :
Geomorphology
ISSN :
0169-555X
eISSN :
1872-695X
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
251
Pages :
6-19
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Service Public de Wallonie (Direction des Cours d'Eau Non Navigables) and the European Union through a LIFE + Project (Walphy).
Available on ORBi :
since 21 March 2016

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