Know more

About cookies

What is a "cookie"?

A "cookie" is a piece of information, usually small and identified by a name, which may be sent to your browser by a website you are visiting. Your web browser will store it for a period of time, and send it back to the web server each time you log on again.

Different types of cookies are placed on the sites:

  • Cookies strictly necessary for the proper functioning of the site
  • Cookies deposited by third party sites to improve the interactivity of the site, to collect statistics

Learn more about cookies and how they work

The different types of cookies used on this site

Cookies strictly necessary for the site to function

These cookies allow the main services of the site to function optimally. You can technically block them using your browser settings but your experience on the site may be degraded.

Furthermore, you have the possibility of opposing the use of audience measurement tracers strictly necessary for the functioning and current administration of the website in the cookie management window accessible via the link located in the footer of the site.

Technical cookies

Name of the cookie

Purpose

Shelf life

CAS and PHP session cookies

Login credentials, session security

Session

Tarteaucitron

Saving your cookie consent choices

12 months

Audience measurement cookies (AT Internet)

Name of the cookie

Purpose

Shelf life

atid

Trace the visitor's route in order to establish visit statistics.

13 months

atuserid

Store the anonymous ID of the visitor who starts the first time he visits the site

13 months

atidvisitor

Identify the numbers (unique identifiers of a site) seen by the visitor and store the visitor's identifiers.

13 months

About the AT Internet audience measurement tool :

AT Internet's audience measurement tool Analytics is deployed on this site in order to obtain information on visitors' navigation and to improve its use.

The French data protection authority (CNIL) has granted an exemption to AT Internet's Web Analytics cookie. This tool is thus exempt from the collection of the Internet user's consent with regard to the deposit of analytics cookies. However, you can refuse the deposit of these cookies via the cookie management panel.

Good to know:

  • The data collected are not cross-checked with other processing operations
  • The deposited cookie is only used to produce anonymous statistics
  • The cookie does not allow the user's navigation on other sites to be tracked.

Third party cookies to improve the interactivity of the site

This site relies on certain services provided by third parties which allow :

  • to offer interactive content;
  • improve usability and facilitate the sharing of content on social networks;
  • view videos and animated presentations directly on our website;
  • protect form entries from robots;
  • monitor the performance of the site.

These third parties will collect and use your browsing data for their own purposes.

How to accept or reject cookies

When you start browsing an eZpublish site, the appearance of the "cookies" banner allows you to accept or refuse all the cookies we use. This banner will be displayed as long as you have not made a choice, even if you are browsing on another page of the site.

You can change your choices at any time by clicking on the "Cookie Management" link.

You can manage these cookies in your browser. Here are the procedures to follow: Firefox; Chrome; Explorer; Safari; Opera

For more information about the cookies we use, you can contact INRAE's Data Protection Officer by email at cil-dpo@inrae.fr or by post at :

INRAE

24, chemin de Borde Rouge -Auzeville - CS52627 31326 Castanet Tolosan cedex - France

Last update: May 2021

Menu Logo Principal Logo SAS Logo de l'Institut Agro Rennes-Angers

Home page

Le projet SELUNE

SELUNE-0

Observatory of water, sediment and chemical fluxes in response to dam removal in the Selune River

SELUNE

  • 2012-
  • 178 000 € for 2019-2021
  • Coordinator: UMR SAS
  • SAS contact: Ophélie Fovet
  • SAS research axis: Ressources
  • website
  • Keywords: suspended sediments, dissolved elements, geomorphology, dam removal, dam

Research

Physical obstacles such as dams influence fluxes of water, sediment and biogeochemical elements as well as the geomorphology. To identify, quantify and understand the consequence of dam removal in the Selune River, observations are being conducted that combine continuous monitoring of water, suspended solids (SS) and biogeochemical fluxes with geomorphological assessment. Fluxes are measured at two stations, one upstream and one downstream of the two dams, equipped with sensors for measuring discharge, turbidity, and physico-chemical parameters continuously. Weekly and storm samples were taken at both stations to measure concentrations of SS, phosphorus (P), dissolved nitrogen and silica (Si). Several variables are spatially analyzed (i.e. bankfull channel width, bank height, longitudinal profile, gravel bed grain size), along with the mobility of bed load, measured using RFID transponders.

Results for the pre-removal period:

Event dynamics of river concentrations between the two stations emphasized the buffering effect of the dams, with a retention of SS and P. Biological consumption in the reservoirs modifies the seasonal dynamics of Si and dissolved P concentrations but not that of nitrate concentration. The composition and granulometry of SS indicates a seasonal and biogenic origin downstream from the dams that differs from the SS that enters the dams. Annual biogeochemical loads increase as water flux increases, with higher loads downstream for dissolved elements and lower loads for SS and P. No downstream propagation signal from incision or paving could be detected despite high specific stream power (30-45 W.m-2) and a mean mobility of coarse sediments of approximately 1 m per year.

Publications

Fovet, O., Ndom, M., Crave, A., Pannard, A., 2020. Influence of dams on river water-quality signatures at event and seasonal scales: The Selune River (France) case study. River Res. Appl., 12. https://doi.org/10.1002/rra.3618

Basilico, L., Roussel, J.-M., Peress, J., Ronot, C. et Fraisse, S. 2021. Quand les rivières reprennent leur cours - Notes sur l’effacement de barrages et de seuils, sur la Sélune et ailleurs. Office français de la biodiversité. Collection Rencontres-Synthèse. 76 pages. Chp. 2.3 – La dynamique fluviale : effet des barrages et premières réponses.

https://professionnels.ofb.fr/sites/default/files/pdf/documentation/RS_2021_Effacement_Selune.pdf

Fovet, O., Ndom, M., Gilliet, N. and Crave, A. Understanding the effect of reservoirs on suspended sediments and biogeochemical fluxes over seasonal and storm scales. Poster at European Geosciences Union General Assembly 2018, Apr 2018, Vienne, Austria. Geophysical Research Abstracts, 20, pp.EGU2018-6470, 2018.

Martignac F., Le Gonidec C., Daroux A., Guillard J., Baglinière J.L., Grimaldi C., Crave A., 2014,

Rapport d’étape 2013, Rapport d’étape annuel-Programme Sélune : Phase pré-arasement – Volets biocénose et géomorphologie, flux sédimentaire hydriques et chimiques.

Le Gonidec C., Grimaldi C., Crave A., Rollet A-J., Beauchamp A., Lespez L., 2015, Rapport d’étape 2014, Rapport d’étape annuel-Programme Sélune : Phase pré-arasement – Volet A : Dynamique fluviale : Flux hydriques, sédimentaires et chimique et géomorphologie

Le Gonidec C., Grimaldi C., Fovet O., Vergnaud V., 2016, Rapport bilan 2013-2015 phase pré-arasement, Dynamique fluviale-Volet 1 : flux hydriques, sédimentaires et chimiques

Rollet A-J., Crave A., Beauchamp A., Lespez L., Le Gonidec C., 2016, Rapport bilan 2013-2015 phase pré-arasement, Dynamique fluviale-Volet 2 : Géomorphologie

Mamadou NDOM, Ophélie FOVET, Alain CRAVE et Nicolas GILLIET, 2018, Rapport bilan 2016-2017 phase pré-arasement, Dynamique fluviale-Volet 1 : flux hydriques, sédimentaires et chimiques

Mamadou NDOM, Ophélie FOVET, Alain CRAVE et Nicolas GILLIET, 2019, Rapport bilan 2017-2018 phase pré-arasement, Dynamique fluviale-Volet 1 : flux hydriques, sédimentaires et chimiques

Mamadou NDOM, Ophélie FOVET, Alain CRAVE et Nicolas GILLIET, 2020, Rapport bilan 2018-2019 phase « Travaux d’arasement », Dynamique fluviale-Volet 1 : flux hydriques, sédimentaires et chimiques

SAS staff involved

  • Chercheur(e)s : Ophélie Fovet, Catherine Grimaldi (2012-2015)
  • Field staff: Nicolas Gilliet (2012-2018), Mikael Faucheux (support)
  • Laboratory staff: Béatrice Trinkler (2012-2020), Laurence Carteaux (2012-) Yannick Fauvel (2021-), Gaelle Hamelin (2021-)
  • Project Engineer: Claude Legonidec (2011-2015), Mamadou Ndom (2017-2021), Vincent Stubbe (2021-)

Partners

Funding and Support

SELUNE-1
SELUNE-2
SELUNE-3