E3S Web Conf.
Volume 40, 2018River Flow 2018 - Ninth International Conference on Fluvial Hydraulics
|Number of page(s)||8|
|Section||River morphodynamics and restoration|
|Published online||05 September 2018|
Quantification of the morphodynamics and ecological functionality of a Mediterranean river
Université Côte d'Azur, CNRS, ESPACE, France
2 Université Lumière – Lyon 2, UFR Temps et Territoires, 69007 Lyon, France
3 SMIAGE Maralpin, 06201 Nice cedex 3, France
4 Agence de l'Eau Rhône Méditerranée Corse, Délégation Paca & Corse, 13001 Marseille, cedex 01, France
5 Agence de l'Eau Rhône Méditerranée Corse, Direction de la planification et de la programmation, 69363 Lyon, cedex 07, France
* Corresponding author: email@example.com
The Var River (South-East France) was extensively modified (channelization, dams…) on the 21th century and is currently undergoing an ambitious restoration project to restore its 'natural' active braiding pattern on the downstream reach of the river. As part of the feedback evaluation of the project, this study aims at: (1) quantifying the morphological evolution of the bed that is recovering from sediment discontinuity; (2) identifying and/or developing hydromorphological and ecological indicators which quantify improvement in the river system from hydrosedimentary and ecological points of view. We used LiDAR and orthophoto datasets and performed analyses for unchannelized braiding rivers [1, 2]. Active width (Wrestored = 242 ± 19 m vs. values ranging from 103 ± 53 to 163 ± 53 m for 'unrestored' reaches) and normalized bed relief index values (BRI*restored = 0,003 ± 0,001 vs. 0,003 ± 0,003 to 0,007 ± 0,004 for 'unrestored' reaches) indicate a combination of low roughness and wide active width. Thus the 'restored' reach shows a different set of indices compared to nearby 'unrestored' reaches, suggesting these tools are promising in discriminating 'restored' vs. 'unrestored' reaches. Adapting existing methods from 'natural' to 'channelized' braiding rivers widened the potential application of the tools developed by Lallias-Tacon  to modified braiding river systems.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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