Magnetic tracing of fine-sediment over pool-riffle morphology

Auteur(s) et Affiliation(s)

MILAN, D.J.

Dept. of Geography, Environment and Earth Sciences, Univ., Hull, Royaume-Uni

LARGE, A.R.G.

School of Geography and Politics, Daysh Building, Newcastle Univ., Newcastle upon Tyne, Royaume-Uni

Description :
This paper describes the methodology behind the artificial magnetic enhancement of iron-stained sand, and presents the results from sand tracing exercises conducted on two gravel-bed channels with pool-riffle morphology; one unregulated and sinuous in nature (site A), the other regulated and straight (site B), both situated on the River Rede Northumberland, UK. Two tonnes of magnetically enhanced tracer sand was introduced to site A and four tonnes to site B, to provide information on fine-sediment storage dynamics, interaction of fines with the stream bed, and rates of movement, expressed as virtual velocity (Vi). It is highlighted that : Fines are stored on bars and riffle margins and appear not to be routed through pools; Fines did not appear to infiltrate the substrate; Tracer dispersion is lumpy and relates to variations in stream energy through pools and riffles. Moreover, tracer centroid position permitted calculation of tracer virtual velocity.

Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2014, vol. 115, p. 139-149, nombre de pages : 11, Références bibliographiques : 1 p.

Date :
2014

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena

Langue :
Anglais