Abstract
Mitigation of a slow-moving landslide hazard requires a good knowledge of the landslide movements. This paper presents results of geophysical investigation and slope movement monitoring to understand the characteristics of an active landslide above a railway station in Garut, Indonesia. For this purpose, a series of resistivity surveys was then conducted using a dipole-dipole method to map the hydrological condition of the landslide area, and geotechnical monitoring was conducted to characterize the movement. Based on the N–S resistivity profiles, highly saturated zones, indicated by low resistivity values, exist in soil layers at a depth greater than 7.5 m. The saturated zone also develops in the near-surface soil layer in the landslide body. The slope movement monitoring records suggest that the landslide consists of several landslide segments with different rates of movement and deep sliding zone. Based on this current study, the characteristics of landslide movement is very site specific and is mainly associated with localized hydrological conditions. Because the surface water infiltration from the irrigation ditches and rice fields controls the landslide reactivation, a better surface water and sub-surface water management is, therefore, necessary to reduce the landslide risks to the railway infrastructures.
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Acknowledgements
This research was funded by LIPI Research Grant and JSPS Scientific Research Grant (Grant No. 24,310,139) for FY 2013–2014.
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Tohari, A., Koizumi, K., Syahbana, A.J., Oda, K. (2017).
Understanding of Landslide Movement at Bumi Waluya Railway Station, Garut, Indonesia.
In: Mikos, M., Tiwari, B., Yin, Y., Sassa, K. (eds) Advancing Culture of Living with Landslides. WLF 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-53498-5_36
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DOI: https://doi.org/10.1007/978-3-319-53498-5_36
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