Over het archief
Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.
Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.
Basisinformatie over ‘Open Access to scholarly information'.
The effect of migrating dune forms on the flow field of an alluvial river
Delecluyse, K.; Troch, P.; Blanckaert, K. (2010). The effect of migrating dune forms on the flow field of an alluvial river, in: Dittrich, A. et al. (Ed.) Proceedings of the International Conference on Fluvial Hydraulics, Braunschweig, Germany, September 08-10, 2010: River flow 2010 [CD-ROM]. pp. 913-919
In: Dittrich, A. et al. (Ed.) (2010). Proceedings of the International Conference on Fluvial Hydraulics, Braunschweig, Germany, September 08-10, 2010: River flow 2010. Bundesanstalt für Wasserbau: [s.l.]. ISBN 978-3-939230-00-7. 1 CD-ROM pp., meer
|
| Beschikbaar in | Auteurs |
|
Documenttype: Congresbijdrage
|
| Author keywords |
Open-channel flow; channel bend ,mobile bed; migrating dunes; bank erosion |
| Abstract |
The bed of an alluvial river is highly susceptible to changes during the course of its existence. Besides variations of the large scale topography and plan form of the river, smaller scale dune forms can be observed. These recurring dune forms migrate on top of the large scale topography and can yield local yet important variations in the flow field. In order to study the effect of migrating dune forms on the flow characteristics and consequently the erosive capacity of an alluvial river, an experiment with mobile bed has been carried out in a laboratory flume representing a sharp meander bend. In this experiment, changes to an initially flat, slightly sloped river bed under a steady flow and sediment discharge were observed until a recurring pattern of migrating dune forms could be seen on top of the characteristic pool-bar topography of meander bends. Once the dune forms were established, an Acoustic Doppler Velocity Profiler (ADVP) was placed in several positions alongside the river bend and used to measure the flow depth and flow characteristics under the influence of the passing dunes. Several times during the experiment, the topography was mapped using laser altimetry on a grid of large spatial resolution in order to isolate the dune forms from the large scale topography and determine the dune characteristics and the dune celerity. In this paper the large scale topography and dune characteristics will be shown and the effect of the migrating dune forms on the flow field and the erosive capacity will be discussed in detail. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
