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

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Issue date
2017-07-21
Author
Marteau, Baptiste
Batalla, Ramon J.
Vericat Querol, Damià
Gibbins, Chris N.
Suggested citation
Marteau, Baptiste; Batalla, Ramon J.; Vericat Querol, Damià; Gibbins, Chris N.; . (2017) . The importance of a small ephemeral tributary for fine sediment dynamics in a main‐stem river. River Research and Applications, 2017, vol. 33, núm. 10, p. 1564-1574. https://doi.org/10.1002/rra.3177.
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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.
URI
http://hdl.handle.net/10459.1/69373
DOI
https://doi.org/10.1002/rra.3177
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River Research and Applications, 2017, vol. 33, núm. 10, p. 1564-1574
European research projects
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  • Articles publicats (Grup de Recerca de Dinàmica Fluvial (RIUS)) [35]
  • Articles publicats (CTFC) [175]
  • Articles publicats (Medi Ambient i Ciències del Sòl) [381]

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  • Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river 

    Marteau, Baptiste; Batalla, Ramon J.; Vericat Querol, Damià; Gibbins, Chris N. (Springer, 2018)
    Purpose A disconnected ephemeral tributary was reconnected to the regulated River Ehen (NW England) as part of a river restoration initiative, providing a renewed delivery of sediment to a highly stable and armoured ...
  • Application of Structure‐from‐Motion photogrammetry to river restoration 

    Marteau, Baptiste; Vericat Querol, Damià; Gibbins, Chris N.; Batalla, Ramon J.; Green, David (John Wiley & Sons, 2016-11-08)
    Structure‐from‐Motion (SfM) photogrammetry is now used widely to study a range of earth surface processes and landforms, and is fast becoming a core tool in fluvial geomorphology. SfM photogrammetry allows extraction of ...
  • Geomorphological response to system‐scale river rehabilitation II: Main‐stem channel adjustments following reconnection of an ephemeral tributary 

    Marteau, Baptiste; Gibbins, Chris N.; Vericat Querol, Damià; Batalla, Ramon J. (John Wiley & Sons Ltd, 2020-07-26)
    This paper describes changes in bed morpho‐dynamics and topography in the River Ehen, a regulated river in NW England (i.e., temperate climate) following a rehabilitation project that reconnected a formerly diverted headwater ...

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