RT Journal Article
T1 Using UAV and Structure-From-Motion Photogrammetry for the Detection of Boulder Movement by Storms on a Rocky Shore Platform in Laghdira, Northwest Morocco
A1 Sedrati, Mouncef
A1 Morales González, Juan Antonio
A1 El M’rini, Abdelmounim
A1 Anthony, Edward J.
A1 Bulot, Glen
A1 Gall, Romain Le
A1 Tadibaght, Abdelkarim
AB The detachment and mobilization of boulders from rocky shore platforms by waves involves complex geomorphic and hydrodynamic processes. Understanding these processes requiresprecise information on the rates and patterns of movement of these megaclasts scaled against thewave conditions that generate boulder mobility. Repeat photogrammetry and structure-from-motion (SfM) models commonly used in geomorphic analyses are an interesting option for monitoringboulder dynamics. In this study, we used unmanned aerial vehicle (UAV)-based digital photogrammetry and SfM differential models to identify recent boulder movements over a rocky shore platform in Laghdira, Morocco. Combining these results with data on storm occurrence in the studyarea allowed us to identify storm waves as the unique driver of the dislodged and mobilized boulders. The identified storm event had a significant wave height of 5.2 m. The UAV models were builtfrom imagery captured in September and December 2019 using a DJI MAVIC PRO PLATINUM,and we used QGIS to produce 2D and 3D model outputs. The exploitation of the 2D model differentials allowed us to appreciate the response of the boulders to the storm waves and to determineplatform volumetric changes and, therefore, boulder mobility. The 3D models were valuable in determining the mode of transport of the boulders. Mobility patterns included sliding, overturningwith no further mobility, and rotation and saltation, as well as boulder breakup. Storm waves didnot have a preferential impact on any particular boulder shape, size category, or position at theouter edge of the platform. These results highlight the utility of combining UAV surveys with identified storm events, which are much more frequent than tsunamis, in determining observed boulderinitiation and mobility
PB MDPI
SN 2072-4292 (electrónico)
YR 2022
FD 2022-08
LK http://hdl.handle.net/10272/21150
UL http://hdl.handle.net/10272/21150
LA eng
NO Sedrati, M.; Morales, J.A.; El M’rini, A.; Anthony, E.J.; Bulot, G.; Le Gall, R.; Tadibaght, A. Using UAV and Structure-From-Motion Photogrammetry for the Detection of Boulder Movement by Storms on a Rocky Shore Platform in Laghdira, Northwest Morocco. Remote Sens.14, 4102, (2022). https://doi.org/ 10.3390/rs14164102
NO This research is part of the project Gof-Boulders “Geomorphological control on offshoreboulders transport along a wave-dominated coast” funded by ISblue—the Interdisciplinary graduate school for the blue planet (ANR-17-EURE-0015)—and co-funded by a grant from the Frenchgovernment under the program “Investissements d’Avenir”. The authors are grateful to Iliass Sedrati for his untiring help and logisticalpreparation of the survey missions, Anass Sedrati and Haj Abdallah Sedrati for their support duringthe field surveys, and Reda Hawat for operating the drone. We also thank the Provincial Directoratein Larache of the Ministry of Equipment, Transport, Logistics, and Water, as well as the RoyalArmed Forces, for authorizations and support in the field
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026