A multi-sensor approach to monitor the ongoing restoration of edaphic conditions for salt marsh species facing sea level rise: An adaptive management case study in Camargue, France
2024
Davranche, Aurélie | Arzel, Céline | Pouzet, Pierre | Carrasco, A. Rita | Lefebvre, Gaëtan | Lague, Dimitri | Thibault, Marc | Newton, Alice | Fleurant, C. | Maanan, Mohamed | Poulin, Brigitte | Lammi Biological Station (LBS) ; Helsingin yliopisto = Helsingfors universitet = University of Helsinki | Université d'Angers (UA) | University of Turku | Knowledge Learning and Information Modelling (LABISEN-KLAIM) ; Laboratoire ISEN (L@BISEN) ; Institut supérieur de l'électronique et du numérique (ISEN)-YNCREA OUEST (YO)-Institut supérieur de l'électronique et du numérique (ISEN)-YNCREA OUEST (YO) | Centre for Marine and Environmental Research [Faro] (CIMA) ; Universidade do Algarve (UAlg) | Tour du Valat, Research Institute for the conservation of Mediterranean Wetlands | Géosciences Rennes (GR) ; Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) | Observatoire des Sciences de l'Univers de Rennes (OSUR) ; Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Laboratoire de Planétologie et Géosciences [UMR_C 6112] (LPG) ; Le Mans Université (UM)-Université d'Angers (UA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST) ; Nantes Université - pôle Sciences et technologie ; Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie ; Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ) | Littoral, Environnement, Télédétection, Géomatique UMR 6554 (LETG) ; Université de Brest (UBO)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (Nantes Univ - IGARUN) ; Nantes Université - pôle Humanités ; Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Humanités ; Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ) | Nantes Université (Nantes Univ) | Fundacao para a Ciencia e a Tecnologia | Academy of Finland | Agence de l'Eau Rhone Mediterranee Corse | Region Bretagne | Région Pays de la Loire | MAVA Foundation
International audience
Mostrar más [+] Menos [-]Inglés. The Camargue or Rhône delta is a coastal wetland in southern France of which parts formerly devoted to salt production are undergoing a renaturation process. This study assessed a multisensor approach to investigate the link between sediment size distribution, habitat development mapped with Worldview 2, flooding durations estimated with time series of SENTINEL 2 images and elevation modelled with a LIDAR point cloud in former saltworks. A Random Forest classification algorithm was used to map the vegetation distributions of Sarcocornia fruticosa and Arthrocnemum macrostachyum, main representatives of the NATURA 2000 “Mediterranean and thermo-Atlantic halophilous scrubs (Sarcocornetea fruticosi)” habitat on the site. The best habitat map was obtained when considering the species separately. The random forest Out-of-bag errors were 1.43 % for S. fruticosa and 2.18 % for A. macrostachyum. Both species were generally distributed on different elevation and flooding duration zones considering mean values. Flooding duration was estimated with the Water In Wetland index (WIW) based on 15 Sentinel-2 scenes. Two models related to sediment grain size distribution were developed: one predicting the flooding duration and one predicting the halophilous scrub distribution. Maps of flooding duration, sediment grain size distribution and elevation highlighted two main zones in the study area: a western section with coarser sediments, shorter flooding durations and higher elevations under sea influence; an eastern section with finer sediments, longer hydroperiods and lower elevations under a historic river influence. This multidisciplinary approach offers perspectives for using space-based data over large scales to monitor changes in edaphic conditions of coastal areas facing natural and anthropogenic forcings. The results call for further investigations to predict the dynamic distribution of other coastal habitats following climate change impacts, such as sea level rise.
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