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Erschienen in:
2025 | OriginalPaper | Buchkapitel
Numerical Modelling of Rainfall Triggered Landslides: A Case Study in the Darjeeling-Sikkim Himalayan Region
verfasst von : Paridhi Pandey, Nabarun Dey, Paratibha Aggrawal
Erschienen in: Proceedings of 9IYGEC 2023, Volume 2
Verlag: Springer Nature Singapore
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Abstract
Landslides are prevalent in the Darjeeling-Sikkim Himalayan region. Chandmari Hill in Gangtok has been prone to landslides since 1960. The 1997 Chandmari Landslide caused eight deaths and damaged several essential infrastructures making it one of the most destructive landslide in the region. On the day of the slide, the city recorded five hours of heavy rainfall of 224 mm. The uppermost layer of the slope consists of medium-grained sandy soil mixed with boulders and weathered mica gneiss, and the bottom layer, more than a depth of 20 m, has quartz mica schist bedrock. This paper attempts to analyze the effect of rainfall on triggering the 1997 Chandmari Landslide. More emphasis is given on the failed part of slope that is steep part of slope. The two-dimensional numerical model investigates the seepage into the slope and the corresponding change in water table and pore water pressure. The analysis pointed out that with increasing rainfall and duration the pore water pressure increases within the shallow depth.