Natural Hazards

, Volume 43, Issue 1, pp 23–44 | Cite as

Trends in landslide occurrence in Nepal

  • David N. Petley
  • Gareth J. Hearn
  • Andrew Hart
  • Nicholas J. Rosser
  • Stuart A. Dunning
  • Katie Oven
  • Wishart A. Mitchell
Original Paper

Abstract

Nepal is a mountainous, less developed kingdom that straddles the boundary between the Indian and Himalayan tectonic plates. In Nepal, landslides represent a major constraint on development, causing high levels of economic loss and substantial numbers of fatalities each year. There is a general consensus that the impacts of landslides in countries such as Nepal are increasing with time, but until now there has been little or no quantitative data to support this view, or to explain the causes of the increases. In this paper, a database of landslide fatalities in Nepal has been compiled and analysed for the period 1978–2005. The database suggests that there is a high level of variability in the occurrence of landslides from year to year, but that the overall trend is upward. Analyses of the trends in the data suggest that there is a cyclicity in the occurrence of landslide fatalities that strongly mirrors the cyclicity observed in the SW (summer) monsoon in South Asia. Perhaps surprisingly the relationship is inverse, but this is explained through an inverse relationship between monsoon strength and the amount of precipitation in the Hill District areas of Nepal. It is also clear that in recent years the number of fatalities has increased dramatically over and above the effects of the monsoon cycle. Three explanations are explored for this: land-use change, the effects of the ongoing civil war in Nepal, and road building. It is concluded that a major component of the generally upward trend in landslide impact probably results from the rural road-building programme, and its attendant changes to physical and natural systems.

Keywords

Landslide Vulnerability Monsoon Precipitation Roads 

References

  1. Alexander D (1993) Natural disasters. Chapman & Hall, New York, 632 ppGoogle Scholar
  2. Alexander D (2005) Vulnerability to landslides. In: Glade T, Anderson MG, Crozier MJ (eds) Landslide hazard and risk. Wiley, Chichester, 824 ppGoogle Scholar
  3. Barling M (2001) Rural-urban migration in Colombia. Geogr Rev 15(1):15–18Google Scholar
  4. Barnard PL, Owen LA, Sharma MC, Finkel RC (2001) Natural and human-induced landsliding in the Garhwal Himalaya of northern India. Geomorphology 40:21–35CrossRefGoogle Scholar
  5. Bookhagen B, Thiede RC, Strecker MR (2005) Abnormal monsoon years and their control on erosion and sediment flux in the high, arid northwest Himalaya. Earth Planet Sci Lett 231(1–2):131–146CrossRefGoogle Scholar
  6. Brabb E (1991) The world landslide problem. Episodes 14:52–61Google Scholar
  7. Chalise SR, Shrestha ML, Thapa KB, Shrestha BR, Bajracharya B (1996) Climatic and Hydrological Atlas of Nepal. ICIMOD, Kathmandu, Nepal, 264 ppGoogle Scholar
  8. Chen H, Petley DN (2005) The impact of landslides and debris flows triggered by Typhoon Mindulle in Taiwan. Q J Eng Geol Hydrogeol 38(3):301–304CrossRefGoogle Scholar
  9. Costa JE, Schuster RL (1991) Documented historical landslide dams from around the world. US Geol Surv Open-File Rep 486:91–239Google Scholar
  10. Crozier MJ (2005) Multiple-occurrence regional landslide events in New Zealand: hazard management issues. Landslides 2(4):247–256CrossRefGoogle Scholar
  11. Cruden D, Varnes D (1996) Landslide Types and Processes. In: Turner A, Schuster RL (eds) Landslides: investigation and mitigation. Transportation Research Board, National Research Council 247:36–75Google Scholar
  12. Dunning SA, Rosser NJ, Petley DN, Massey CR (2006) in press. Formation and failure of the Tsatichhu landslide dam, Bhutan. Landslides 3(2):107–113, DOI: 10.1007/s10346-005-0032-xCrossRefGoogle Scholar
  13. Dussauge C, Grasso JR, Helmstetter A (2003) Statistical analysis of rockfall volume distributions: implications for rockfall dynamics. J Geophys Res 108(B6):2286, DOI: 10.1029/2001JB000650CrossRefGoogle Scholar
  14. FAO (2005) Global Forest Resources Assessment (2005). Forestry Paper 147, Forestry Department, Food and Agriculture Organization of The United Nations, Rome, Italy, 320 ppGoogle Scholar
  15. Gerrard AJW, Gardner RAM (2000a) Relationships between rainfall and landsliding in the Middle Hills, Nepal. Nor Geogr Tidsskr 54:74–81CrossRefGoogle Scholar
  16. Gerrard J, Gardner RAM (2000b) The nature and management implications of landsliding on irrigated terraces in the Middle Hills of Nepal. Int J Sus Dev World Ecol 7:229–236CrossRefGoogle Scholar
  17. Gerrard AJ, Gardner RAM (2002) Relationships between landsliding and land use in the Likhu Khola drainage basin, Middle Hills, Nepal. Mt Res Dev 22(1):48–55CrossRefGoogle Scholar
  18. Glade T (2003) Landslide occurrence as a response to land use change: a review of evidence from New Zealand. Catena 51(3–4):297–314CrossRefGoogle Scholar
  19. Govil K (2000) Forest resources of Nepal, country report. Forest Resources Assessment Working Paper 016, Forestry department, food and agriculture organization of the United Nations, Rome, Italy, 78 ppGoogle Scholar
  20. Guzzetti F (2000) Landslide fatalities and the evaluation of landslide risk in Italy. Eng Geol 58:89–107CrossRefGoogle Scholar
  21. Hannah DM, Kansakar SR, Gerrard AJ, Rees G (2005) Flow regimes of Himalayan rivers of Nepal: nature and spatial patterns. J Hydrol 308:18–32CrossRefGoogle Scholar
  22. Hewitt K (1997) Regions of risk: a geographical introduction to disasters. Addison Wesley Longman, Harlow, UK, 389 ppGoogle Scholar
  23. Hittelman AM, Lockridge PA, Whiteside LS, Lander JF (2001) Interpretive pitfalls in historical hazards data. Nat Hazards 23(2–3):315–338CrossRefGoogle Scholar
  24. Horii T, Hanawa K (2004) A relationship between timing of El Niño onset and subsequent evolution. Geophys Res Lett 31:L063041–L063044CrossRefGoogle Scholar
  25. Hovius N, Stark CP, Allen PA (1997) Sediment flux from a mountain belt derived by landslide mapping. Geology 25:231–234CrossRefGoogle Scholar
  26. Hovius N, Stark CP, Hao-Tsu C, Lin JC (2000) Supply and removal of sediment in a landslide-dominated mountain belt: Central Range, Taiwan. J Geol 108:73–89CrossRefGoogle Scholar
  27. Joshi AL (1998) Underlying Causes of Deforestation and Participatory Forest Management Policy in Nepal. Proceedings of the IGES International Workshop on Forest Conservation Strategies for the Asia and Pacific Region. Available online: http://www.iges.or.jp/en/fc/phase1/1ws-contents.htmGoogle Scholar
  28. Li J, Zeng Q (2003) A new monsoon index and the geographical distribution of the global monsoons. Adv Atmos Sci 20:299–302CrossRefGoogle Scholar
  29. Lin JC, Petley DN, Jen CH, Hsu ML (2006) Slope movements in a dynamic environment—A case study of Tachia river, Central Taiwan. Q Int 147(1):103–112CrossRefGoogle Scholar
  30. Malamud BD, Turcotte DL, Guzzetti F, Reichenbach P (2004) Landslide inventories and their statistical properties. Earth Sur Processes Landforms 29:687–711CrossRefGoogle Scholar
  31. Murphy W, Petley DN, Bommer J, Mankelow JW (2002) Geotechnical and seismological uncertainty in the assessment of slope stability during earthquakes. Q J Eng Geol Hydrogeol 35:71–78CrossRefGoogle Scholar
  32. Nayava JL (2004) The temporal variations in rainfall in Nepal since 1971 to 2000. J Hydrol Meteorol 1(1):24–33Google Scholar
  33. Owen LA, Sharma M, Bigwood R (1995) Mass movement hazard in the Garhwal Himalaya: the effects of the 20th October 1991 Garhwal earthquake and the July-August monsoon season. In: McGregor DFM, Thompson DA (eds) Geomorphology and land management in a changing environment. London, Wiley, 69–88Google Scholar
  34. Parthasarathy B, Munot AA, Kothawale DR (1995) Monthly and seasonal rainfall series for All-India homogeneous regions and meteorological subdivisions: 1871–1994. Indian Institute of Tropical Meteorolgy Research Report RR–065, Pune 411 008, IndiaGoogle Scholar
  35. Petley DN, Dunning SA, Rosser NJ (2005a) The analysis of global landslide risk through the creation of a database of worldwide landslide fatalities. In: Hungr O, Fell R, Couture R, Eberhardt E (eds) Landslide risk management, AT Balkema, Amsterdam, 367–374Google Scholar
  36. Petley DN, Hearn GJ, Hart A (2005b) Towards the development of a landslide risk assessment for rural roads in Nepal. In: Glade T, Anderson M, Crozier MJ (eds) Landslide hazard and risk. Wiley, Chichester, 597–620Google Scholar
  37. Petley DN, Higuchi T, Petley DJ, Bulmer MH, Carey J (2005c) The development of progressive landslide failure in cohesive materials. Geology 33(3):201–204CrossRefGoogle Scholar
  38. Petley DN, Oven K, Mitchell WA, Rosser NJ, Dunning SA, Allison RJ (2006) The role of global and regional precipitation patterns in landslide generation. In: Ashaari M (ed) Proceedings of the International conference on slopes Malaysia 2006. Public Works Department, Kuala Lumpur, pp 249–268Google Scholar
  39. Sah MP, Mazari RK (1998) Anthropogenically accelerated mass movement, Kulu Valley, Himachal Pradesh, India. Geomorphology 26(1–3):123–138CrossRefGoogle Scholar
  40. Sarkar S, Kanungo DP, Mehrotra GS (1995) Landslide hazard zonation: a case study in Garhwal Himalaya, India. Mt Res Dev 15(4):301–309CrossRefGoogle Scholar
  41. Schuster RL, Highland LM (2001) Socioeconomic and environmental impacts of landslides in the western hemisphere, USGS Open-File Report, 01–276Google Scholar
  42. Sepúlveda S, Murphy W, Jibson RW, Petley DN (2005) Seismically-induced rock slope failures resulting from topographic amplification of strong ground motions: the case of pacoima canyon, California. Eng Geol 80(3–4):336–348CrossRefGoogle Scholar
  43. Shrestha AB, Wake CP, Dibb JE, Mayewski PA (2000) Precipitation fluctuations in the Nepal Himalaya and its vicinity and relationship with some large scale climatological parameters. Int J Climatol 20(3):317–327CrossRefGoogle Scholar
  44. Sidle RC, Ziegler AD, Negishi JN Nik AR, Siew R, Turkelboom F (2006) Erosion processes in steep terrain—Truths, myths, and uncertainties related to forest management in Southeast Asia. Forest Ecology and Management 224(1–2):199–225CrossRefGoogle Scholar
  45. Stark CP, Hovius N (2001) The characterization of landslide size distributions. Geophys Res Lett 28:1091–1094CrossRefGoogle Scholar
  46. Turcotte DL (1999) Self-organized criticality. Reports on Progress in Physics 62:1377–1429Google Scholar

Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  • David N. Petley
    • 1
  • Gareth J. Hearn
    • 2
  • Andrew Hart
    • 2
  • Nicholas J. Rosser
    • 1
  • Stuart A. Dunning
    • 1
  • Katie Oven
    • 1
  • Wishart A. Mitchell
    • 1
  1. 1.International Landslide Centre, Department of GeographyDurham UniversityDurhamUK
  2. 2.Scott Wilson Kirkpatrick LtdScott House, Basing View, BasingstokeHampshireUK

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