Landslide detection and monitoring capability of boat-based mobile laser scanning along Dieppe coastal cliffs, Normandy

Détails

Ressource 1Demande d'une copieEtat: Supprimée
Version: de l'auteur
ID Serval
serval:BIB_90022AA26771
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Landslide detection and monitoring capability of boat-based mobile laser scanning along Dieppe coastal cliffs, Normandy
Périodique
Landslides
Auteur(s)
Michoud C., Carrea D., Costa S., Derron M.-H., Jaboyedoff M., Delacourt C., Maquaire O., Letortu P., Davidson R.
ISSN
1612-510X (Print)
1612-5118 (Electronic)
Statut éditorial
Publié
Date de publication
2015
Peer-reviewed
Oui
Volume
12
Numéro
2
Pages
403-418
Langue
anglais
Résumé
Integrated in a wide research assessing destabilizing and triggering factors to model cliff dynamic along the Dieppe's shoreline in High Normandy, this study aims at testing boat-based mobile LiDAR capabilities by scanning 3D point clouds of the unstable coastal cliffs. Two acquisition campaigns were performed in September 2012 and September 2013, scanning (1) a 30-km-long shoreline and (2) the same test cliffs in different environmental conditions and device settings. The potentials of collected data for 3D modelling, change detection and landslide monitoring were afterward assessed. By scanning during favourable meteorological and marine conditions and close to the coast, mobile LiDAR devices are able to quickly scan a long shoreline with median point spacing up to 10cm. The acquired data are then sufficiently detailed to map geomorphological features smaller than 0.5m2. Furthermore, our capability to detect rockfalls and erosion deposits (>m3) is confirmed, since using the classical approach of computing differences between sequential acquisitions reveals many cliff collapses between Pourville
and Quiberville and only sparse changes between Dieppe and Belleville-sur-Mer. These different change rates result from different rockfall susceptibilities. Finally, we also confirmed the capability of the boat-based mobile LiDAR technique to monitor single large changes, characterizing the Dieppe landslide geometry with two main active scarps, retrogression up to 40m and about 100,000m3 of eroded materials.
Mots-clé
Mobile laser scanning, Coastline change detection, Rockfall, Landslide monitoring, High Normandy coastal cliffs
Création de la notice
19/04/2016 21:20
Dernière modification de la notice
03/03/2018 19:23
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