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Discharge and suspended sediment time series as controls on fine sediment ingress into gravel river beds

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journal contribution
posted on 31.10.2018, 14:38 by Kate L. Mathers, Stephen RiceStephen Rice, Paul WoodPaul Wood
Fine sediment availability and channel hydraulics are two of the primary controls on the ingress of fine sediment into gravel river beds. A novel dataset consisting of fine sediment ingress measurements coupled with high-resolution turbidity and discharge time series, was analysed to investigate relations between ingress, discharge and turbidity. Discharge and turbidity demonstrated a weak association with each other, and their relations with fine sediment ingress were relatively weak. An alternative, but widely applied ‘redundancy’ approach was investigated that focused on key metrics, or facets, of the discharge and turbidity time series and their association with fine sediment ingress. Principal component analysis was used to distil the most important facets driving variation in the discharge and turbidity datasets and these were then used as independent variables in regression models with sediment ingress as the dependent variable. These models accounted for a larger amount of the statistical variation in sediment ingress over time than discharge and turbidity time series. Facets of the turbidity time series were found to be the most effective explanatory variables. The results suggest that this approach could be valuable and justify its application and testing across a range of river types in different hydrological and sedimentary settings. Application of this method could improve our generic understanding of what controls ingress at larger spatial and temporal scales and therefore complements process-based approaches, which is vital for the development of fine sediment management strategies.

Funding

KLM was a recipient of a Glendonbrook doctoral studentship and co-funding from the Environment Agency whilst undertaking this research.

History

School

  • Social Sciences

Department

  • Geography and Environment

Published in

Catena

Volume

173

Pages

253-263

Citation

MATHERS, K.L., RICE, S.P. and WOOD, P.J., 2018. Discharge and suspended sediment time series as controls on fine sediment ingress into gravel river beds. CATENA, 173, pp.253-263.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Catena and the definitive published version is available at https://doi.org/10.1016/j.catena.2018.10.001

Acceptance date

04/10/2018

Publication date

2018-10-24

Copyright date

2019

ISSN

0341-8162

eISSN

1872-6887

Language

en