Open image in new windowLandslide Diversity in the Rwenzori Mountains (Uganda)

  • Liesbet Jacobs
  • Olivier Dewitte
  • Clovis Kabaseke
  • François Kervyn
  • Jan Maes
  • Kewan Mertens
  • Adriano Nobile
  • John Sekajugo
  • Jean Poesen
  • Denis Samyn
  • Matthieu Kervyn
Conference paper

Abstract

In the Rwenzori Mountains, at the border between Uganda and the D.R. Congo, landslides frequently occur and cause fatalities and substantial damage to agricultural land and infrastructure. Up until recently, no information on the landslide characteristics, occurrence or spatial distribution was available. The use of archive inventories and field surveys however allowed identifying the key mass wasting processes in this region and their triggering and controlling factors. Here, we present the results of these multi-temporal archive and field inventories. The Rwenzori mountains are diverse in lithology, topography and land use patterns. This diversity in landslide controlling factors is also reflected in the types of landslides that occur in this 3000 km2 large region. The majority of the Rwenzori Mountains consists of steep slopes on gneiss, mica-schists and amphibolite lithologies. A dominance of shallow translational soil slides is observed in gneiss while the amphibolite is found not to be prone to such landslides. This is in sharp contrast to the lowlands, which are characterized by gentle slopes and a rift alluvium lithology. In contrast to what was expected, the largest landslide densities are found in these lowlands where large, deep-seated rotational soil slides with head scarps up to 30 m depth prevail. In both the lowlands and the uplands, slope gradients appears to be the main topographic predictor for the spatial occurrence of landslides. Finally, concerning landslide triggering events, in both the archive inventory and the field surveys, rainfall-triggered landslides are the most common but co-seismic slides were also observed.

Keywords

Landslides Rwenzori Mountains East-African rift 

References

  1. Bauer FU, Karl M, Glasmacher UA et al (2012) The Rwenzori Mountains of western Uganda—aspects on the evolution of their remarkable morphology within the Albertine Rift. J Afr Earth Sci 73–74:44–56. doi:10.1016/j.jafrearsci.2012.07.001 CrossRefGoogle Scholar
  2. Brink AB, Bodart C, Brodsky L et al (2014) Anthropogenic pressure in East Africa—Monitoring 20 years of land cover changes by means of medium resolution satellite data. Int J Appl Earth Obs Geoinf 28:60–69. doi:10.1016/j.jag.2013.11.006 CrossRefGoogle Scholar
  3. Jacobs L, Dewitte O, Poesen J, Delvaux D, Thiery W, Kervyn M (2016a) The Rwenzori Mountains, a landslide-prone region? Landslides 13(3):519–536. doi:10.1007/s10346-015-0582-5 CrossRefGoogle Scholar
  4. Jacobs L, Dewitte O, Poesen J, Maes J, Mertens K, Sekajugo J, Kervyn M (2016b) Landslide characteristics and spatial distribution in the Rwenzori Mountains, Uganda. J Afr Earth Sci doi:10.1016/j.jafrearsci.2016.05.013
  5. Jagger P, Shively G (2014) Land use change, fuel use and respiratory health in Uganda. Energy Policy 67:713–726. doi:10.1016/j.enpol.2013.11.068 CrossRefGoogle Scholar
  6. Keefer DK (2002) Investigating landslides caused by earthquakes-a historical review. Surv Geophys 23(6):473–510CrossRefGoogle Scholar
  7. Knapen A, Kitutu MG, Poesen J et al (2006) Landslides in a densely populated county at the footslopes of Mount Elgon (Uganda): Characteristics and causal factors. Geomorphology 73:149–165. doi:10.1016/j.geomorph.2005.07.004 CrossRefGoogle Scholar
  8. Koehn D, Lindenfeld M, Rümpker G et al (2010) Active transsection faults in rift transfer zones: evidence for complex stress fields and implications for crustal fragmentation processes in the western branch of the East African Rift. Int J Earth Sci 99:1633–1642. doi:10.1007/s00531-010-0525-2 CrossRefGoogle Scholar
  9. Lindenfeld M, Rümpker G, Link K et al (2012) Fluid-triggered earthquake swarms in the Rwenzori region, East African Rift—evidence for rift initiation. Tectonophysics 566–567:95–104. doi:10.1016/j.tecto.2012.07.010 CrossRefGoogle Scholar
  10. Maes J, Kervyn M, de Hontheim A, Dewitte O, Jacobs L, Mertens K, Poesen J (2017) Landslide risk reduction measures: A review of practices and challenges for the tropics. Prog Phys Geogr, doi:10.1177/0309133316689344
  11. Mertens K, Jacobs L, Maes J, Kabaseke C, Maertens M, Poesen J, Kervyn M, Vranken L (2016) The direct impact of landslides on household income in tropical regions: a case study from the Rwenzori Mountains in Uganda. Sci Total Environ 550:1032–1043CrossRefGoogle Scholar
  12. Ost L, Van Den Eeckhaut M, Poesen J, Vanmaercke-Gottigny MC, Ost Lieven (2003) Characteristics and spatial distribution of large landslides in the Flemish Ardennes (Belgium). Zeitschrift fur Geomorphol N F 47:329–350Google Scholar
  13. Roller S, Wittmann H, Kastowski M, Hinderer M (2012) Erosion of the Rwenzori Mountains, East African Rift, from in situ-produced cosmogenic 10 Be. J Geophys Res 117:F03003. doi:10.1029/2011JF002117 CrossRefGoogle Scholar
  14. Simmons WC (1930) Local earth tremors recorded in February and March connected with an epicenter near Rwenzori. Geol. Surv. Dept. Uganda, Ann. Rep. for 1929: 33–37Google Scholar
  15. Statoids (2013) Administrative divisions of countries. http://www.statoids.com/uug.html. Accessed 15 April 2014
  16. Taylor RG, Mileham L, Tindimugaya C, Mwebembezi L (2009) Recent glacial recession and its impact on alpine riverflow in the Rwenzori Mountains of Uganda. J Afr Earth Sci 55:205–213. doi:10.1016/j.jafrearsci.2009.04.008 CrossRefGoogle Scholar
  17. UNESCO (1966) Earthquake Reconnaissance Mission, Uganda, The Toro earthquake of 20 March 1966. UNESCO. http://unesdoc.unesco.org/images/0000/000077/007799EB.pdf. Accessed 25 April 2014
  18. USGS (2014) Significant earthquake archive. Earthquake hazard program. http://earthquake.usgs.gov/earthquakes/eqinthenews/. Accessed 4th December 2014
  19. USGS (2015) Earthquake archives. http://earthquake.usgs.gov/earthquakes/search/. [on line] Accessed 31th July 2015

Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Liesbet Jacobs
    • 1
    • 2
  • Olivier Dewitte
    • 1
  • Clovis Kabaseke
    • 3
  • François Kervyn
    • 1
  • Jan Maes
    • 2
    • 4
  • Kewan Mertens
    • 6
  • Adriano Nobile
    • 1
  • John Sekajugo
    • 5
  • Jean Poesen
    • 4
  • Denis Samyn
    • 1
  • Matthieu Kervyn
    • 2
  1. 1.Department of Earth SciencesRoyal Museum for Central AfricaTervurenBelgium
  2. 2.Department of Geography Earth System ScienceVrije Universiteit BrusselElseneBelgium
  3. 3.School of Agricultural and Environmental SciencesMountains of the Moon UniversityFort PortalUganda
  4. 4.Division of Geography and TourismKU LeuvenHeverleeBelgium
  5. 5.Department of Natural Resource EconomicsBusitema UniversityTororoUganda
  6. 6.Division of Bio-EconomicsKU LeuvenHeverleeBelgium

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