Landslide Hazard and Risk Level Assessment of Quarried Slopes in Lebanon using Drone Imagery

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dc.contributor.author Kaafarani, Rouba
dc.date.accessioned 2022-04-12T09:28:32Z
dc.date.available 2022-04-12T09:28:32Z
dc.date.copyright 2020 en_US
dc.date.issued 2020-08-18
dc.identifier.uri http://hdl.handle.net/10725/13481
dc.description.abstract Human activities are continuously altering the geometry and steepness of natural slopes. When left exposed and unprotected, these slopes become susceptible to slide due to natural triggering factors like earthquakes and rainfall. Quarrying activities, in particular, contribute largely to slope failures worldwide, especially when unorganized and chaotic. In Lebanon, quarries are scattered randomly across the country and lack proper urban planning and management. Regional scale maps have been recently generated in a Geographic Information System (GIS) platform to identify hazard and risk areas for co-seismic and rainfall induced landslides; however, their applicability to altered “quarried” slopes has not been tested. In this research, we present a thorough methodology to assess, at a site-specific level, the hazard and risk levels of quarried slopes under three conditions: dry condition, heavy rainfall condition, and seismic condition. The aim is to ascertain the degree of accuracy of the regional scale maps in predicting landslides in quarried areas. A jointed limestone quarry in Bafliye, South of Lebanon, was mapped with a DJI Phantom 4 V2.0 drone, recreated as a 3D scene, assessed kinematically, and then analyzed using limit equilibrium and numerical modelling techniques. At failure, the maximum runout distance and the corresponding angle of reach were determined. The studied slope showed signs of failure under seismic events having a 10% chance of exceedance in 50 years, and under rainfall events having a 10-year return period with a relatively small runout distance of 7.76 m, yielding a low risk failure. The output of safety factors matched between the site specific and the regional scale analyses, while the failing mass volume and the corresponding risk levels did not. This indicated that the wedge failure analysis used in the regional scale analysis is adequate in predicting only hazard levels at quarried sites. en_US
dc.language.iso en en_US
dc.subject Landslide hazard analysis -- Lebanon en_US
dc.subject Quarries and quarrying -- Environmental aspects -- Lebanon en_US
dc.subject Slopes (Soil mechanics) -- Lebanon -- Stability en_US
dc.subject Landslides -- Risk assessment -- Lebanon en_US
dc.subject Lebanese American University -- Dissertations en_US
dc.subject Dissertations, Academic en_US
dc.title Landslide Hazard and Risk Level Assessment of Quarried Slopes in Lebanon using Drone Imagery en_US
dc.type Thesis en_US
dc.term.submitted Spring en_US
dc.author.degree MS in Civil And Environmental Engineering en_US
dc.author.school SOE en_US
dc.author.idnumber 201305146 en_US
dc.author.commembers Abi Shdid, Caesar
dc.author.commembers Tabbara, Mazen
dc.author.department Civil Engineering en_US
dc.description.physdesc 1 online resource (xiii, 92 leaves) : col. ill., col. maps. en_US
dc.author.advisor Abou Jaoude, Grace
dc.keywords Quarrying en_US
dc.keywords Site specific en_US
dc.keywords Regional scale en_US
dc.keywords Drone en_US
dc.keywords Landslide en_US
dc.keywords Hazard en_US
dc.keywords Seismic and rainfall events en_US
dc.description.bibliographiccitations Includes bibliographical references (leaf 46-51). en_US
dc.identifier.doi https://doi.org/10.26756/th.2022.284
dc.author.email rouba.kaafarani@lau.edu.lb en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/thesis.php en_US
dc.publisher.institution Lebanese American University en_US
dc.author.affiliation Lebanese American University en_US

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