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Logjam controls on channel:floodplain interactions in wooded catchments and their role in the formation of multi-channel patterns

Sear, D.A., Millington, C.E., Kitts, D.R. and Jeffries, R. (2010) Logjam controls on channel:floodplain interactions in wooded catchments and their role in the formation of multi-channel patterns Geomorphology, 116, (3-4), pp. 305-319. (doi:10.1016/j.geomorph.2009.11.022).

Record type: Article

Abstract

The role of wood in the formation and maintenance of complex dynamic floodplain surfaces is important and
to date has received relatively limited attention compared to in-channel habitat processes. This paper
explores the role of logjams as important agents of channel:floodplain interaction. We draw on a specific
case study as well as examples from the literature to show that although the processes of interaction differ,
the resulting dynamic floodplain patchwork is a common feature of rivers with logjams. In addition, we
contend that the presence of logjams is an important factor in the evolution and maintenance of multiple
channel patterns in both montane and lowland river environments. These observations have important
implications for the definition of reference targets for river restoration.
The specific results of this research show:
1) The presence of a range of types of multiple channel network dissecting the floodplains of low order
channels that are strongly associated with the presence of logjams.
2) The relatively rapid formation of floodplain channels following logjam formation.
3) The dynamic nature of logjams within headwater channels on both seasonal and annual timescales that
lead to a highly dynamic habitat mosaic on the floodplain surface.
4) An increased frequency of overbank flooding and high rates of floodplain sediment accumulation
upstream of logjams and along floodplain channel networks that create the complex topography
observed in the case study forested floodplains.

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More information

Published date: 1 April 2010
Keywords: large wood, forested floodplain, multi-channel patterns, floodplain channels, logjams

Identifiers

Local EPrints ID: 147875
URI: http://eprints.soton.ac.uk/id/eprint/147875
ISSN: 0169-555X
PURE UUID: 8bccce01-9c04-4faf-9f17-cab238bd7637
ORCID for D.A. Sear: ORCID iD orcid.org/0000-0003-0191-6179

Catalogue record

Date deposited: 26 Apr 2010 15:59
Last modified: 18 Jul 2017 19:33

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Contributors

Author: D.A. Sear ORCID iD
Author: C.E. Millington
Author: D.R. Kitts
Author: R. Jeffries

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