Implementation of a granulometric measurement protocol using underwater imagery and monitoring of the effects of ecological restoration of the Rhône
Year: 2025
Type: conference-paper
Abstract: Anthropogenic developments on the Rhône have disrupted its hydrosedimentary functioning (Rossignon et al., 2019; Donati et al., 2020). The 1990s saw the development of an ecological restoration program, one of the current aims of which is to restore the river's morphosedimentary dynamics, enabling diversification and an improvement in the biological quality of the environment. Restoration operations involve removing the Girardon structures, opening up disconnected secondary channels and reinjecting sediment (CNR GRAIE-OHM, 2023). This work forms part of the operational monitoring of the restoration, carried out by CNR, in order to assess its impact on the hydromorphology of the channel, and more specifically on aquatic habitats and biocenoses. In this context, a protocol for analysing the granulometry of the bottom of the main channel of the Rhône is proposed.Granulometric data were collected using an underwater camera and processed automatically using an AI developed by Styx4D. The present contribution firstly aims to determine the main errors made during automated processing with a view to improving it. The second stage involves optimizing the protocol, by streamlining a maximized sampling plan, while retaining as much information as possible, in order to limit data acquisition and processing time. The results obtained will be used to carry out further research as part of a thesis on the morphological changes brought about by the restoration work, the temperature at the bottom of the channel and changes in habitats with a view to identifying a biological response.
Source: HAL
Language: English
Subfield: Earth-Surface Processes
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7205566975