Parker, C;
Henshaw, AJ;
Harvey, GL;
Sayer, CD;
(2017)
Reintroduced large wood modifies fine sediment transport and storage in a lowland river channel.
Earth Surface Processes and Landforms
, 42
(11)
pp. 1693-1703.
10.1002/esp.4123.
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Abstract
This paper explores changes in suspended sediment transport and fine sediment storage at the reach and patch scale associated with the reintroduction of partial LW jams in an artificially over-widened lowland river. The field site incorporates two adjacent reaches: a downstream section where LW jams were reintroduced in 2010 and a reach immediately upstream where no LW was introduced. LW pieces were organised into ‘partial’ jams incorporating several ‘key pieces’ which were later colonised by substantial stands of aquatic and wetland plants. Reach-scale suspended sediment transport was investigated using arrays of time-integrated suspended sediment samplers. Patch-scale suspended sediment transport was explored experimentally using turbidity sensors to track the magnitude and velocity of artificially generated sediment plumes. Fine sediment storage was quantified at both reach and patch scales by repeat surveys of fine sediment depth. The results show that partial LW jams influence fine sediment dynamics at both the patch and reach scale. At the patch-scale, introduction of LW led to a reduction in the concentration and increase in the time lag of released sediment plumes within the LW, indicating increased diffusion of plumes. This contrasted with higher concentrations and lower time lags in areas adjacent to the LW; indicating more effective advection processes. This led to increased fine sediment storage within the LW compared with areas adjacent to the LW. At the reach-scale there was a greater increase in fine sediment storage through time within the restored reach relative to the unrestored reach, although the changes in sediment transport responsible for this were not evident from time-integrated suspended sediment data. The results of the study have been used to develop a conceptual model which may inform restoration design.
| Type: | Article |
|---|---|
| Title: | Reintroduced large wood modifies fine sediment transport and storage in a lowland river channel |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/esp.4123 |
| Publisher version: | http://dx.doi.org/10.1002/esp.4123 |
| Language: | English |
| Additional information: | This is the peer reviewed version of the following article: Parker, C., Henshaw, A. J., Harvey, G. L., and Sayer, C. D. (2017) Reintroduced large wood modifies fine sediment transport and storage in a lowland river channel. Earth Surf. Process. Landforms (2017), which has been published in final form at http://dx.doi.org/10.1002/esp.4123. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL SLASH UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1539980 |
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