HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Bank re-erosion action to promote sediment supply and channel diversification: Feedback from a restoration test on the Rhine

Abstract : River regulation alters hydrological and sediment regimes and consequently affects habitat complexity and dynamics, biodiversity and ecosystem services. Although channel bank erosion is a key geomorphological process supplying alluvial channels with coarse sediments and diversifying aquatic and riparian habitats, banks have often been stabilized to limit erosion risk to human activities and facilities. The objective of this paper is to assess the effects, and their sustainability, of bank protection removal on a 300-m long reach of the Old Rhine (France/Germany) to promote sediment supply, channel diversification and a rehabilitation of fluvial morpho-sedimentary processes. This action was combined with the construction of two island groynes to locally increase bank erosion processes. Yearly detailed monitoring was implemented over 6 years, including classical bathymetric surveys, airborne topo-bathymetric and terrestrial LiDAR, and bed grain-size and bedload tracking. Following a Q15 flood, the restoration induced a weak sediment supply. The restoration diversified habitats due to the implementation of the two island groynes, inducing bank scouring and the creation of new macroforms, as well as local bed grain-size diversification and fining. The cross-sectional diversity of the restored water channel was close to the regularization engineering phase. Channel bedform diversification persisted 6 years due to the persistence of the two island groynes. The action induced the rehabilitation of fluvial forms, in a static manner, rather than the rehabilitation of fluvial morpho-sedimentary processes, which raises questions about the sustainability of the benefits of such management actions in terms of fluvial functionality and naturality.
Complete list of metadata

https://hal-cnrs.archives-ouvertes.fr/hal-03634705
Contributor : Valentin Chardon Connect in order to contact the contributor
Submitted on : Monday, April 11, 2022 - 11:03:40 AM
Last modification on : Tuesday, April 12, 2022 - 3:32:44 AM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2022-09-28

Please log in to resquest access to the document

Identifiers

Collections

Citation

Valentin Chardon, Laurent Schmitt, Anne Clutier. Bank re-erosion action to promote sediment supply and channel diversification: Feedback from a restoration test on the Rhine. River Research and Applications, Wiley, In press, ⟨10.1002/rra.3968⟩. ⟨hal-03634705⟩

Share

Metrics

Record views

8