Seminar “Fluvial remote sensing : from reach-scale diagnosis to large scale planning”
Channel change understanding is becoming an issue for managing flooding and bank erosion risks or assessing riverine ecosystem status for targeting river restoration, mitigation or preservation. In this domain, remote sensing techniques are more and more common. H. Piégay first proposes an overview of the different tools now available for researchers (LiDAR, SfM photogrammetry, GIS toolboxes, airborne and satellite imagery, RFID tracking from drone, video-monitoring, online monitoring tools). Practical examples are then developed based on some of these tools to evaluate channel changes (e.g. channel narrowing, vegetation encroachment or grain size coarsening) or monitor channel responses to restoration actions (e.g., channel bed aggradation following gravel augmentation). He then shows hydrographic network scale approaches (10 to 40000 km of river length) with examples on river character assessment (riparian continuity along channel banks, channel shifting, channel incision). Such approaches are useful for practitioners to design policy to improve river status at large basin scale.
Hervé Piégay, research director at the National Center of Scientific Research, got his Ph.D. in 1995 on the interactions between riparian vegetation and channel geomorphology. Since 1995 he is continuing his studies at the University of Lyon (Ecole Normale Supérieure of Lyon), France. He is a fluvial geomorphologist involved in integrated sciences for rivers, strongly interacting with hydraulic engineers, freshwater ecologists and practitioners (Water Agencies, Regions, Ministry of Ecology, French agency for biodiversity, Compagnie Nationale du Rhône, and EDF, the main French hydroelectric company). He is working on river management, planning and restoration, developing methodological frameworks and tools using GIS and remote sensing. He has contributed to more than 200 papers in peer-review journals and book chapters and has coordinated several edited books such as Tools in Fluvial Geomorphology – Handbook for ecologists and practitioners with M.G. Kondolf (2003, 2015), Gravel-bed rivers 6 : From process understanding to river restoration with H. Habersack and M. Rinaldi (2007) or fluvial remote sensing for science and management with P. Carbonneau (2012). He got in 2018 the Linton Award of the Bristish Society for Geomorphology.
Is geomorphology really an issue in river restoration?