Fine-Scale Monitoring of Long-term Wetland Loss Using LiDAR Data and Historical Aerial Photographs: the Example of the Couesnon Floodplain, France / RAPINEL, Sébastien (2017)

Public Titre : Fine-Scale Monitoring of Long-term Wetland Loss Using LiDAR Data and Historical Aerial Photographs: the Example of the Couesnon Floodplain, France Type de document : texte imprimé Auteurs : Sébastien RAPINEL ; Bernard CLEMENT ; Simon DUFOUR ; Laurence HUBERT-MOY Mention d'édition : Novembre 2017 Année de publication : 2017 Importance : 13 p. ISBN/ISSN/EAN : DOI 10.1007/s13157-017-0985-2 Note générale : Publié dans : Wetlands. Official Scholarly Journal of the Society of Wetland Scientists ISSN 0277-5212 DOI 10.1007/s13157-017-0985-2 Langues : Anglais (eng) Catégories : Ecoplanète CONSERVATION DE LA NATURE ; TELEDETECTION ; ZONE HUMIDE Mots-clés : Lidar  Perte de zones humides Résumé : Wetland area has decreased in most parts of the world and remains threatened by human pressures. However, wetland loss is difficult to accurately detect, delineate and quantify. While wetland distribution is influenced mainly by landform, LiDAR data provide accurate digital elevation models that can be used to delineate wetlands. Our objective was to map wetland loss at a finescale using LiDAR data and historical aerial photographs based on a functional typology that identifies potential, existing and efficient wetlands. The study focused on a 132 km2 site with valley bottom wetlands located in western France. Boundaries of potential wetlands were extracted from a LiDAR-derived Digital Terrain Model that was standardized according to channel network elevation. We identified existing wetlands using interpretation of aerial photographs acquired in 1952, 1978 and 2012. We used multiple correspondence analysis to identify different types of wetland loss. Results show that potential wetlands were successfully delineated at 1:5000 (88–90% overall accuracy) and that 14% of existing wetland area was lost. This highlights the importance of identifying Bnegotiation areas^ where wetland restoration is a priority. The results also reveal two main types of wetland loss based on area, geomorphic context, land cover and period of loss. Genre de document : Article Descripteur géographique : BRETAGNE