The importance of a small ephemeral tributary for fine sediment dynamics in a main-stem river

B. Marteau*, R. J. Batalla, D. Vericat, C. Gibbins

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Studies of ephemeral streams have focused mainly in arid and semi-arid regions. Such streams also occur widely in temperate regions, but much less is known about their influence on fluvial processes in main-stem rivers here. In this paper, we present evidence of the importance of a small ephemeral temperate stream for main-stem fine sediment dynamics. The paper focuses on a restoration project (River Ehen, North West England) which involved the reconnection of a headwater tributary to the main-stem river. We present data on suspended sediment transport 2 years prior to and 2 years following the reconnection. Despite the small size and non-perennial flow of the tributary, its reconnection resulted in an increase of 65% in the main-stem sediment yield. During both the pre-reconnection and post-reconnection periods, a higher proportion of the annual yield was conveyed during short events with relatively high suspended sediment concentrations. Following the reconnection, the magnitude and frequency of such events increased, primarily due to sediment being delivered from the tributary at times when main-stem flows were not elevated. Overall, the main-stem remains supply limited and so is highly dependent on sediment delivered from the tributary. The study helps stress that even non-perennial tributaries yielding only a small increase in catchment size (+1.2% in this case) can have a major influence on main-stem fluvial dynamics. Their role as sediment sources may be especially important where, as in the case of the Ehen, the main-stem is regulated and the system is otherwise starved of sediment.

Original languageEnglish
Pages (from-to)1564-1574
Number of pages11
JournalRiver Research and Applications
Volume33
Issue number10
Early online date21 Jul 2017
DOIs
Publication statusPublished - 1 Dec 2017

Fingerprint

tributary
Sediments
Rivers
stem
river
sediment
Suspended sediments
suspended sediment
Arid regions
Sediment transport
ephemeral stream
Catchments
fluvial process
Restoration
sediment yield
semiarid region
headwater
sediment transport
catchment

Keywords

  • channel reconnection
  • ephemeral stream
  • regulated river
  • river restoration
  • suspended fine sediment
  • temperate region

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Environmental Science(all)

Cite this

The importance of a small ephemeral tributary for fine sediment dynamics in a main-stem river. / Marteau, B.; Batalla, R. J.; Vericat, D.; Gibbins, C.

In: River Research and Applications, Vol. 33, No. 10, 01.12.2017, p. 1564-1574.

Research output: Contribution to journalArticle

Marteau, B. ; Batalla, R. J. ; Vericat, D. ; Gibbins, C. / The importance of a small ephemeral tributary for fine sediment dynamics in a main-stem river. In: River Research and Applications. 2017 ; Vol. 33, No. 10. pp. 1564-1574.
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N1 - ACKNOWLEDGEMENTS: This work was funded by a grant from the Environment Agency (EA) and United Utilities (UU). We thank Jane Atkins, Andy Newton, Gail Butterill, and Helen Reid of EA and Grace Martin and Kat Liney of UU for their help and support during this project. Damià Vericat is funded by a Ramon y Cajal Fellowship (RYC-2010-06264). Authors acknowledge the support from the Economy and Knowledge Department of the Catalan Government through the Consolidated Research Group “Fluvial Dynamics Research Group”—RIUS (2014 SGR 645), and the additional support provided by the CERCA Programme, also from the Catalan Government. We also thank the Environment Agency and two anonymous reviewers whose comments have helped improve the paper.

PY - 2017/12/1

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N2 - Studies of ephemeral streams have focused mainly in arid and semi-arid regions. Such streams also occur widely in temperate regions, but much less is known about their influence on fluvial processes in main-stem rivers here. In this paper, we present evidence of the importance of a small ephemeral temperate stream for main-stem fine sediment dynamics. The paper focuses on a restoration project (River Ehen, North West England) which involved the reconnection of a headwater tributary to the main-stem river. We present data on suspended sediment transport 2 years prior to and 2 years following the reconnection. Despite the small size and non-perennial flow of the tributary, its reconnection resulted in an increase of 65% in the main-stem sediment yield. During both the pre-reconnection and post-reconnection periods, a higher proportion of the annual yield was conveyed during short events with relatively high suspended sediment concentrations. Following the reconnection, the magnitude and frequency of such events increased, primarily due to sediment being delivered from the tributary at times when main-stem flows were not elevated. Overall, the main-stem remains supply limited and so is highly dependent on sediment delivered from the tributary. The study helps stress that even non-perennial tributaries yielding only a small increase in catchment size (+1.2% in this case) can have a major influence on main-stem fluvial dynamics. Their role as sediment sources may be especially important where, as in the case of the Ehen, the main-stem is regulated and the system is otherwise starved of sediment.

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