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ISPRS Int. J. Geo-Inf. 2016, 5(4), 50; doi:10.3390/ijgi5040050

Potential of UAVs for Monitoring Mudflat Morphodynamics (Application to the Seine Estuary, France)

1
Domaines Océaniques - UMR 6538, Université de Bretagne Occidentale, IUEM, Technopôle Brest-Iroise, Rue Dumont D’Urville, F-29280 Plouzané, France
2
Ifremer - Dyneco/Physed - Centre de Bretagne, BP 70, F-29280 Plouzané, France
3
CEREMA - Centre d’Etudes et d’expertise sur les Risques, l’Environnement, la Mobilité et l’Aménagement, DTechEMF, F-29280 Plouzané, France
4
Université de Rouen, M2C, UMR 6143, CNRS, Morphodynamique Continentale et Côtière, F-76821 Mont Saint Aignan Cedex, France
5
Laboratoire de Géologie de Lyon - UMR 5276, Université Claude Bernard Lyon 1, Campus de la Doua, 2 rue Raphaël Dubois, F-69622 Villeurbanne Cedex, France
*
Author to whom correspondence should be addressed.
Academic Editors: Gonzalo Pajares Martinsanz and Wolfgang Kainz
Received: 23 November 2015 / Revised: 29 March 2016 / Accepted: 8 April 2016 / Published: 13 April 2016
(This article belongs to the Special Issue Unmanned Aerial Vehicles in Geomatics)
View Full-Text   |   Download PDF [4703 KB, uploaded 13 April 2016]   |  

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. View Full-Text
Keywords: coastal monitoring; Unmanned Aerial Vehicle; photogrammetry; estuary; mudflat areas; morphological features coastal monitoring; Unmanned Aerial Vehicle; photogrammetry; estuary; mudflat areas; morphological features
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jaud, M.; Grasso, F.; Le Dantec, N.; Verney, R.; Delacourt, C.; Ammann, J.; Deloffre, J.; Grandjean, P. Potential of UAVs for Monitoring Mudflat Morphodynamics (Application to the Seine Estuary, France). ISPRS Int. J. Geo-Inf. 2016, 5, 50.

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