Novel Combined Approach For Bedrock
Incision Analysis: Geochemistry And Hydraulic
Modelling. Loire River Application (France)
Author(s)
M. Tombozafy, D. Mimoun, M. Batton-Hubert, D. Graillot,
D. Garcia & A. Aoufi
Abstract
The goal is to accurately forecast or understand erosion and deposition in
bedrock river channels. The Loire River (France) was chosen as a case study.
Like most European major rivers, the Loire presents an accelerated incision
(2.5m during the last 150 years). Current models are limited because they can
only accurately simulate aggradation and degradation on alluvial river containing
non-cohesive and cohesive sediments. In our case, these models are not efficient
along the whole length of this river. This is because of the outcropping of
bedrock. This obstacle led us to establish a new manner to characterize bedrock
incision not only by particle impacts but also considering stream flow intensity.
To complete this work, we use the geochemical signature of transported
materials to quantify the amount of substratum eroded between two sampled
areas. This allows us to validate the results of the hydraulic model.
Keywords: sediment transport, bed-load, stream flow, geochemistry, erosion,
bedrock outcrop, numerical scheme.
1 Introduction
The consequences of river incision are multiple: bridge scouring and structure
failure, dam breaks, deeper lowest water levels, decreasing water tables, ripariale
Keywords
sediment transport, bed-load, stream flow, geochemistry, erosion,
bedrock outcrop, numerical scheme.
Related Book
Other papers in this volume
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