Investigating river-restoration-effects on riverbed-stability by physical modelling
Loading...
Author (Corporation)
Publication date
17.04.2024
Typ of student thesis
Course of study
Collections
Type
06 - Presentation
Editors
Editor (Corporation)
Supervisor
Parent work
Special issue
DOI of the original publication
Link
Series
Series number
Volume
Issue / Number
Pages / Duration
Patent number
Publisher / Publishing institution
Place of publication / Event location
Wien
Edition
Version
Programming language
Assignee
Practice partner / Client
Abstract
This study shows how experimental results provide fundamental insights in the challenge of river revitalisation, and thus represent a powerful tool to guide engineers’ actions. Results concerns a study case, namely the “Wiese Vital” project, a restoration project in Basel area (Switzerland), with the objectives of safeguarding Basel's drinking water supply while revitalizing its watercourse and providing flood protection.
The planned revitalisation measures involve the reconstruction of the Wiese riverbed, the introduction of structures to improve its morphological variability and the replenishment of fine sediment to improve the spawning habitat of native fishes.
The new Wiese riverbed will consist of a coarser sediment layer, about 1.2 meters deep, overlaying a layer of finer sediments, meant to protect the underlaying aquifer from undesirable water infiltrations and thus to ensure Basel's drinking water supply safety. The stability of the coarser layer was investigated using a physical model in scale 1 to 20, built in the hydraulic hall of the University of Applied Sciences and Arts Northwestern Switzerland.
Experiments investigated the stability of the coarse protective layer in presence and in absences of revitalization measures: with and without “ecological” structures and before and after the addition of fine sediments.
Results revealed that wrong placement of “ecological” structures can cause local erosion and threaten the stability of the riverbed. Moreover, they provided useful insights on the response of a coarser riverbed to the input of fine sediments.
Keywords
Flood protection, Riverbed stability, Hydraulic modelling, River revitalisation
Subject (DDC)
Event
EGU General Assembly 2024
Exhibition start date
Exhibition end date
Conference start date
14.04.2024
Conference end date
19.04.2024
Date of the last check
ISBN
ISSN
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Review
No peer review
Open access category
License
Citation
Unrau, S., Venuleo, S., Derungs, G., & Lebrenz, H. (2024, April 17). Investigating river-restoration-effects on riverbed-stability by physical modelling. EGU General Assembly 2024. https://doi.org/10.5194/egusphere-egu24-10883