Potential of UAVs for Monitoring Mudflat Morphodynamics (Application to the Seine Estuary, France)
|Author(s)||Jaud Marion1, Grasso Florent2, Le Dantec Nicolas1, 3, Verney Romaric2, Delacourt Christophe1, Ammann Jerome1, Deloffre Julien4, Grandjean Philippe5|
|Affiliation(s)||1 : Univ Bretagne Occidentale, IUEM, Domaines Ocean UMR 6538, Technopole Brest Iroise,Rue Dumont DUrville, F-F29280 Plouzane, France.
2 : Ifremer Dyneco Physed, Ctr Bretagne, BP 70, F-29280 Plouzane, France.
3 : CEREMA Ctr Etud & Expertise Risques Environm Mobi, DTechEMF, F-29280 Plouzane, France.
4 : Univ Rouen, CNRS, M2C, UMR 6143,Morphodynam Continentale & Cotiere, F-76821 Mont St Aignan, France.
5 : Univ Lyon 1, Labe Geol Lyon, UMR 5276, Campus Doua,2 Rue Raphael Dubois, F-69622 Villeurbanne, France.
|Source||Isprs International Journal Of Geo-information (2220-9964) (Mdpi Ag), 2016-04 , Vol. 5 , N. 4 , P. -|
|WOS© Times Cited||49|
|Note||This article belongs to the Special Issue Unmanned Aerial Vehicles in Geomatics|
|Keyword(s)||coastal monitoring, Unmanned Aerial Vehicle, photogrammetry, estuary, mudflat areas, morphological features|
|Abstract||Intertidal mudflats play a critical role in estuarine exchange, connecting marine and continental supplies of nutrients and sediments. However, their complex morphodynamics, associated with a wide range of physical and biological processes, are still poorly understood and require further field investigation. In addition, mudflats are challenging areas for Structure-from-Motion (SfM) photogrammetric surveys. Indeed, the mudflats generally hold back residual tidal water, which can make stereo restitution particularly difficult because of poor correlations or sun-glint effects. This study aims to show the potential of light UAVs (Unmanned Aerial Vehicles) for monitoring sedimentary hydrodynamics at different spatial scales in a silty estuary. For each UAV mission an orthophotograph and a Digital Elevation Model (DEM) are computed. From repeated surveys the diachronic evolution of the area can be observed via DEM differencing. Considering the ground texture in such a context, the stereo restitution process is made possible because of the high spatial resolution of the UAV photographs. Providing a synoptic view as well as high spatial resolution (less than 4 cm), the UAV dataset enables multi-scale approaches from the study of large areas to the morphodynamics of smaller-scale sedimentary structures and the morphodynamics impact of plant ground cover.|