River restoration works design based on the study of early-stage vegetation development and alternate bar dynamics

Jiaze Li*, Nicolas Claude, Pablo Tassi, Florian Cordier, Alessandra Crosato, Stéphane Rodrigues

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Downloads (Pure)

Abstract

Active geomorphological interventions, such as reprofiling of river bars, are often used to increase bar dynamics and prevent vegetation encroachment. River restoration management should be planned based on the knowledge of what processes will follow the intervention and on the anticipation of the consequences. However, in many cases, the associated physical processes are not clearly identified whereas their consequences on bar morphodynamics are still not fully understood. This study aims to bring new insights into the biomorphodynamics evolution of the riverbed after restoration works by using a 2D biomorphodynamic model developed in the TELEMAC-MASCARET system. It seeks to compare and evaluate the performance of five bar reprofiling scenarios in which the bar elevation is lowered to just below the water level at specified design discharges. The study area is located in the channelized and regulated alpine gravel-bed Isère River (France). Bar dynamics and early stages of vegetation establishment are analyzed for the first 2 years after each restoration scenario. The results indicate that plant colonization would occur in all cases. Overall, maximizing the reduction of bar height is the most effective way to improve the bar dynamics and limit future vegetation encroachment.

Original languageEnglish
Pages (from-to)1682-1695
Number of pages14
JournalRiver Research and Applications
Volume39
Issue number9
DOIs
Publication statusPublished - 2023

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • biomorphodynamic numerical modeling
  • vegetated bars restoration

Fingerprint

Dive into the research topics of 'River restoration works design based on the study of early-stage vegetation development and alternate bar dynamics'. Together they form a unique fingerprint.

Cite this