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(Article of periodic en Anglais - 2014)

Document title

The role of vegetation in the retention of fine sediment and associated metal contaminants in London's rivers

Authors(s) and Affiliation(s)

GIBBS H.M. (1) ; GURNELL A.M. (2) ; HEPPELL C.M. (2) ; SPENCER K.L. (2) ;
(1) Water and Environment, Atkins, London, ROYAUME-UNI
(2) School of Geography, Queen Mary Univ., London, ROYAUME-UNI

Abstract

This paper investigates sediment properties at 4 sites across 3 rivers within Greater London to assess the degree to which contaminated sediments are being retained. Within paired restored and unrestored reaches at each site, 4 different bed sediment patch types (exposed unvegetated gravel, sand, and silt/clay (termed "fine") sediments, and in-channel vegetated sediments) were sampled and analysed for a range of metals and sediment characteristics. Many samples were found to exceed Environment Agency guidelines for copper, lead and zinc. At all sites, sediments accumulating around in-channel vegetation were similar in calibre and composition to exposed unvegetated fine sediments. This implies that the changed sediment supply and hydraulic conditions associated with river restoration may lead to enhanced retention of contaminated fine sediments, particularly around emergent plants, frequently leading to the development of submerged and emergent landforms and potential river channel adjustments.

Source

Article of periodic

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

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

Millesime : 2014, vol. 39, no8 [pp. 1115-1127]

Bibliographic references : 2 p.

Collation : 4 fig., 9 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3575

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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