Causes and triggers of deep-seated hillslope instability in the tropics – Insights from a 60-year record of Ikoma landslide (DR Congo)

Dille, A.; Kervyn, F.; Mugaruka Bibentyo, T.; Delvaux, Damien; Ganza, G. B.; Ilombe Mawe, G.; Kalikone Buzera, C.; Safari Nakito, E.; Moeyersons, J.; Monsieurs, Elise; Nzolang, C.; Smets, B.; Kervyn, M.; Dewitte, O.

doi:10.1016/j.geomorph.2019.106835

Article (Scientific journals)

Causes and triggers of deep-seated hillslope instability in the tropics – Insights from a 60-year record of Ikoma landslide (DR Congo)

Dille, A.; Kervyn, F.; Mugaruka Bibentyo, T. et al.

2019 • In Geomorphology, 345, p. 106835

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https://hdl.handle.net/2268/254412

DOI
10.1016/j.geomorph.2019.106835

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Keywords :

Hillslope evolution; Historical aerial photography; Landslide mechanisms and timing; Tropical Africa; UAV; Weathering; Democratic Republic Congo; Kivu

Abstract :

[en] Studying the causes and triggers of landslides is essential to understand the key process of hillslope evolution and the hazards they generate. Such understanding is crucial in tropical areas where landslide impacts are high and on the rise, and the dearth of accurate processes characterisation is large. Here we investigate the timing and the mechanisms of relatively slow-moving deep-seated landslides in weathered tropical environments through the analysis of a landslide located in the Kivu Rift (DR Congo). This landslide, developed in weathered basalt, shows obvious deformation features at its surface indicating large deformations during recent years, making it a unique natural laboratory in an underexplored area. High-resolution topographic data, historical aerial photographs, satellite imagery and careful field investigations are used to detail the landslide mechanisms and investigate failure development over a 60-year record. By confronting rainfall time series and earthquake sequences with the different deformation episodes, we show that the relation between instability triggers and slope failure is not straightforward; e.g., the largest instability occurred at the end of a dry season during a period of relatively low seismicity. Instead of direct influence of external triggers, we show that some phases of instability may be caused by the intrinsic evolution of the hillslope associated with weathered-related weakening of the slope strength through time. Our results question the relative weight of the commonly recognized causes and triggers of slope instability in this area. Analysis of landslide causes and triggers provided here should help improve the understanding of how surface processes influence the pace of hillslope evolution. It also contributes to a more accurate evaluation of the landslide hazard in the area and across other regions where similar environmental conditions are met. © 2019

Disciplines :

Earth sciences & physical geography

Author, co-author :

Dille, A.; Department of Earth Sciences, Royal Museum for Central Africa, Leuvensesteenweg 13, Tervuren, 3080, Belgium, Department of Geography, Earth System Science, Vrije Universiteit Brussel, Pleinlaan 2, Brussels, 1050, Belgium

Kervyn, F.; Department of Earth Sciences, Royal Museum for Central Africa, Leuvensesteenweg 13, Tervuren, 3080, Belgium

Mugaruka Bibentyo, T.; Department of Geology, Université Officielle de Bukavu, Site Universitaire de Karhale, Kadutu, Bukavu, 570, Congo

Delvaux, Damien

Ganza, G. B.; Department of Geology, Université Officielle de Bukavu, Site Universitaire de Karhale, Kadutu, Bukavu, 570, Congo

Ilombe Mawe, G.; Department of Geology, Université Officielle de Bukavu, Site Universitaire de Karhale, Kadutu, Bukavu, 570, Congo

Kalikone Buzera, C.; Department of Geology, Université Officielle de Bukavu, Site Universitaire de Karhale, Kadutu, Bukavu, 570, Congo

Safari Nakito, E.; Centre des Recherches Géologiques et Minières, Station Provincial de Lwiro, B.P. 7, Bukavu, Congo

Moeyersons, J.; Department of Earth Sciences, Royal Museum for Central Africa, Leuvensesteenweg 13, Tervuren, 3080, Belgium

Monsieurs, Elise ; Université de Liège - ULiège > SPHERES

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Language :

English

Title :

Causes and triggers of deep-seated hillslope instability in the tropics – Insights from a 60-year record of Ikoma landslide (DR Congo)

Publication date :

2019

Journal title :

Geomorphology

ISSN :

0169-555X

eISSN :

1872-695X

Publisher :

Elsevier B.V.

Volume :

345

Pages :

106835

Peer reviewed :

Peer Reviewed verified by ORBi

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since 26 December 2020

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