Abstract
Tropical areas like Singapore characteristically receive heavy and prolonged periods of rainfall. During these wet spells, many of the urban engineered slopes become susceptible to landslides, causing much damage to property and causing disruption to urban life. Studies on relationships of wet periods and landslides events reveal that while the weathered materials on urban engineered slopes tend to fail regularly in response to discrete, heavy rainstorm events, they are also closely associated with long periods of antecedent rainfall conditions which often help to reduce the threshold value of discrete rainfall events. Past records of slope failures and recent episodes of failures in Singapore are examined to re-assess this relationship. Study found that there is indeed a close association between the two aspects of any rain event and co-occurrence of the two lead to widespread slope failures.
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References
Agus SS, Leong EC, Rahardjo H (2001) Soil-water characteristic curves of Singapore residual soils. Geotech Geol Eng 19:285–309. doi:10.1023/A:1013175913679
Brand EW (1984) Landslides in southeast Asia: a state-of-the-art report. In: Proceedings of 4th international symposium on landslides, Toronto, pp 377–384
Chatterjea K (1989a) Observations on the fluvial and slope processes in Singapore and their impact on the urban environment. PhD thesis, National University of Singapore, Singapore
Chatterjea K (1989b) Surface wash: the dominant geomorphic process in the surviving rainforest of Singapore. Singap J Trop Geogr 10(2):95–109. doi:10.1111/j.1467-9493.1989.tb00007.x
Chatterjea K (1991) Effectiveness of grass cover in reducing risk of sediment generation on urban slopes: an example from Singapore. Singap J Trop Geogr 12(2):69–81. doi:10.1111/j.1467-9493.1991.tb00030.x
Chatterjea K (1994) Dynamics of fluvial and slope processes in the changing geomorphic environment Singapore. Earth Surf Process Landf 19:585–607. doi:10.1002/esp.3290190702
Chatterjea K (1998) The impact of tropical rainstorms on sediment and runoff generation from bare and grass-covered surfaces: a plot study from Singapore. Land Degrad Dev 9:143–157. doi:10.1002/(SICI)1099-145X(199803/04)9:2<143::AID-LDR264>3.0.CO;2-I
Faisal MA (2000) Unsaturated tropical residual soils and rainfall induced slope failures. In: Rahardjo H, Toll DG, Leong EC (eds) Unsaturated soils for Asia: proceedings of the asian conference on unsaturated soils UNAT-ASIA 2000, Singapore, 18–19 May 2000, Balkema, pp 41–52
Gasmo JM, Hritzuk KJ, Rahardjo H, Leong EC (1999) Instrumentation of an unsaturated residual soil slope. Geotech Test J GTJODJ 22(2):128–137
Gasmo JM, Rahardjo H, Leong EC (2000) Infiltration effects on stability of a residual soil slope. Comput Geotecton 26:145–165. doi:10.1016/S0266-352X(99)00035-X
Horelli JA (2005) Landslides in Hong Kong. Master’s thesis, University of Helsinki, Finland
International Business Times (2008) Rain causes floods, landslides in Hong Kong. www.ibtimes.com/articles/20080607/rain-causes-floods-landslides-in-hong-kong.htm. Accessed on 29 June 2008
Lim TT, Rahardjo H (1994) Field measurement of matric suction in a residual soil slope. In: Proceedings of international conference on landslides, slope stability and the safety of infra-structures, Kuala Lumpur, pp 227–234
Lim TT, Rahardjo H, Chang MF, Fredlund DG (1996) Effect of rainfall on matric suctions in a residual slope. Can Geotech J 33:618–628
Lumb P (1962) General nature of soils of Hong Kong. Q J Eng Geol 8:31–65. doi:10.1144/GSL.QJEG.1975.008.01.02
Mihalic S, Ranko Žugaj R, Jurak V (2008) The influence of heavy rainfall on the landslide initiation. http://kfki.baw.de/fileadmin/conferences/ICHE/2002-arsaw/ARTICLES/PDF/220C2.pdf. Accessed on 28 May 2008
Pitts J (1983) The form and causes of slope failures in an area of west Singapore island. Singap J Trop Geogr 4:162–168. doi:10.1111/j.1467-9493.1983.tb00140.x
Pitts J (1985) An investigation of slope stability on the NTI campus, Singapore. Applied Research Project RPI/83. Nanyang Technological Institute, Singapore, p 55
Pitts J, Cy S (1987) In situ soil suction measurements in relation to slope stability investigations in Singapore. In: Proceedings of the 9th European conference on soil mechanics and foundation engineering, vol 1, pp 79–82
Rahardjo H, Li XW, Toll DG, Leong EC (2001) The effect of antecedent rainfall on slope stability. Geotech Geol Eng 19:371–399. doi:10.1023/A:1013129725263
Rahman A (1992) Soils of Singapore. In: Gupta A, Pitts J (eds) Physical adjustments in a changing landscape, the Singapore story. Singapore University Press, Singapore, pp 144–189
Rezaur RB, Rahardjo H, Leong EC (2002) Spatial and temporal variability of pore-water pressures in residual soil slopes in a tropical climate. Earth Surf Process Landf 27:317–338. doi:10.1002/esp.322
Rezaur RB, Rahardjo H, Leong EC, Lee TT (2003) Hydrological behaviour of residual soil slopes in Singapore. J Hydrol Eng 8(3):133–144. doi:10.1061/(ASCE)1084-0699(2003)8:3(133)
Tan SB, Tan SL, Lim TL, Yang KS (1987) Landslide problems and their control in Singapore. In: Proceedings of 9th southeast Asian geotechnical conference, Bangkok, pp 25–36
Toll DG, Rahardjo H, Leong EC (1999) Landslides in Singapore. In: Proceedings of 2nd international conference on landslides, slope stability and the safety of infra-structures, Singapore, pp 269–276
Toll DG, Tsaparas I, Rahardjo H (2001) The influence of rainfall sequences on negative pore-water pressures within slopes. In: Proceedings of 15th ICSMGE, Istanbul, 27–31 Aug 2001, vol 2, pp 1269–1272
Tsaparas I, Rahardjo H, Toll DG, Leong EC (2002) Controlling parameters for rainfall-induced landslides. Comput Geotecton 29:1–27
Winn K, Rahardjo H, Peng SC (2001) Characterization of residual soils in Singapore. J Southeast Asian Geotech Soc 32(1):1–13
Wong MW (2007) Persistent rain causes landslide, disrupts business operations. Report in Channel NewsAsia, 12 Jan 2007. http://www.channelnewsasia.com/stories/singaporelocalnews/view/252190/1/.html. Accessed on 29 May 2008
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Chatterjea, K. Severe wet spells and vulnerability of urban slopes: case of Singapore. Nat Hazards 56, 1–18 (2011). https://doi.org/10.1007/s11069-009-9362-7
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DOI: https://doi.org/10.1007/s11069-009-9362-7