Author:
Lahai Yusuf Alhaji,Anderson Kelvin F. E.,Jalloh Yaguba,Rogers Ibrahim,Kamara Mohamed
Abstract
AbstractThis work focused on three landslide events that have attracted significant public concern due to the associated calamities they recorded in 1945, 2017 and 2019, i.e. the Charlotte, Regent and Madina landslides, respectively. Their geology, tectonics (structural discontinuities) and geomorphology, i.e. their GTG characteristics were studied to establish links between them and the landslide events.Field surveys were conducted, particularly on the Charlotte landslide, where the identification of geological structures was impeded to an extent by its obliteration by vegetation and sediment accumulations on relatively planar sections of the landslide area. Remote sensing and GIS techniques (earth imagery and drone images) enhanced the mapping and determination of landslides’ geometric and geomorphic parameters. Laboratory analyses of rock and soil samples provided the landslides’ petrological characterisation and were used to determine the particle-size distribution in the slide-prone soil.The study indicated a change in the gabbroic rock composition, variable geomorphological characteristics, and nature/pattern and density of the discontinuities. These factors, to a large extent, determined the nature and magnitude of the rainfall-triggered landslides. Charlotte lithology slightly differed from the other two landslides and recorded higher Silica (Si) and Aluminum (Al) and lower iron (Fe) from X-Ray Fluorescence (XRF) than rocks of Regent and Madina landslides. The study also revealed only a tenuous correlation between rock composition and weathering depth. The slope angles at the landslides’ prominent scarps (depletion zone) are steep (> 45 degrees) with altitudes of approximately 270 m, 200 m and 470 m above sea level for Charlotte, Regent and Madina, respectively. Unlike the Charlotte landslide, both Regent and Madina landslides are active, but geometrically, their area, length and run-out distances have relatively high variance with a coefficient of variance equals to 1. Information derived from this work can help understand the spatial variation in landslide characteristics and develop a susceptibility map.
Publisher
Springer Science and Business Media LLC
Subject
Management, Monitoring, Policy and Law,Geotechnical Engineering and Engineering Geology,Environmental Science (miscellaneous),Safety, Risk, Reliability and Quality,Geography, Planning and Development
Reference78 articles.
1. Adegbe M, Agbor A, Onoduku US, Asema AI, Unubi AS, Inyang EB (2014) Determination of the volume of debris from Yingxiu landslides, Southwest China: geomorphological and field observation approaches. J Nat Sci 2:95–105
2. Afungang RN (2015) Spatiotemporal probabilistic assessment of landslide Hazard along Bamenda Mountain region of the Cameroon volcanic line. Dissertation, University of Yaoundé I
3. Aleotti P, Chowdhury R (1999) Landslide hazard assessment: summary review and new perspectives. Bull EngGeol Environ 58(1):21–44. https://doi.org/10.1007/s100640050066
4. Al-Nahmi F, Alami OB, Baidder L, Khanbari K, Rhinane H, Hilali A (2016) Using Remote sensing for lineament Extraction in Al Magbrabah area-Hajjah, Yemen. The International Archives of the Photogrammetry, remote sensing and Spatial Information Sciences, volume XLII-2/W1, 2016). 3rd International Geo Advances workshop, 16–17 October 2016, Istanbul, turkey
5. Arup, BGS, JBA & INTEGEMS (2018) Sierra Leone Multi-City Hazard review and risk assessment. A report produced for the World Bank Global Facility for Disaster Reduction and Recovery and the Government of Sierra Leone. The World Bank
Cited by
10 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献