Water-worked gravel beds in laboratory flumes - a natural analogue ?

Auteur(s) et Affiliation(s)



Description :
Two types of bed formation were examined : one where sediment is manually placed and screeded and the second where sediment is fed into a running flume. This later technique created deposits through sequential cycles of sediment transport and deposition. Detailed bed surface topography measurements have been made over a screeded bed and three fed beds. In addition, bulk subsurface porosity and hydraulic conductivity have been measured. By comparing the four beds, results revealed that certain physical properties of the screeded bed were clearly different from those of the fed beds. This study clearly showed that caution should be taken when comparing velocity measurements over screeded beds with water-worked beds, and that the formation of fed beds offers an improved way of investigating intragravel flow and sediment-water interface exchange processes in gravel-bed rivers at a laboratory scale.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2009, vol. 34, n°. 3, p. 384-397, nombre de pages : 14, Références bibliographiques : 1 p.

Date :
2009

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