Evaluation of the deposit dynamics on a gravel bar after different hydrologic events
- Resource Type
- Authors
- J. Deng; B. Camenen; T. Drevet; L. Pnard
- Source
- River Flow 2020 Proceedings of the 10th Conference on Fluvial Hydraulics (Delft, Netherlands, 7-10 July 2020)
River Flow 2020
River Flow 2020, Jul 2020, Delft, Netherlands
River Flow 2020 ISBN: 9781003110958
- Subject
- 13. Climate action
Bar (music)
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology
[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology
Geomorphology
Geology
- Language
- English
International audience; Estimating the fine sediment budget in alpine rivers is an important challenge to better understand the morphodynamics of such rivers. In this paper, we describe the dynamics of fine-sediment deposits over a gravel bar before and after two flushing events in an alpine riverbased on pictures taken from the side of the river. These pictures are processed using a new image analysis method. It allows to estimate the spatial distribution of fine-sediment deposit on the gravel bar using photos taken at different dates. Photos before and after the flushing events in 2018 and 2019 were analysed. Comparison with the local in-situ measurement of surface grain size distribution has been carried out using the Wolman peddle count method. The image detection method presents a good agreement on the spatial distribution and variations of fine sediment deposits on the gravel bar with an acceptable bias. A discussion is provided on the limits and validation of the proposed method as well as on its applicability on medium term analysis.