The Effects of Different Geological Conditions on Landslide-Triggering Rainfall Conditions in South Korea

How landslide-triggering rainfall conditions vary with geology is unclear. The effects of three different geological conditions (gneiss, GN; granite, GR; sedimentary rock, SR) on variations in intensity–duration (I-D) conditions and rainfall characteristics responsible for initiating shallow landsli...

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Bibliographic Details
Published in:Water (Basel) 2022-07, Vol.14 (13), p.2051
Main Authors: Lee, Jae-Uk, Cho, Yong-Chan, Kim, Minseok, Jang, Su-Jin, Lee, Jongmyoung, Kim, Sukwoo
Format: Article
Language:English
Subjects:
Datasets
Geology
Gneiss
Igneous rocks
Influence
Landslides
Landslides & mudslides
Lithology
Mechanical properties
Precipitation
Rainfall
Sedimentary rocks
Slopes
Statistical analysis
Stone
Stratigraphy
Topography
Urban areas
Variance analysis
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Summary:How landslide-triggering rainfall conditions vary with geology is unclear. The effects of three different geological conditions (gneiss, GN; granite, GR; sedimentary rock, SR) on variations in intensity–duration (I-D) conditions and rainfall characteristics responsible for initiating shallow landslides were examined using data from 476 landslides in South Korea from 1963 to 2018 and detailed statistical analyses. Results from quantile regression and one-way analysis of variance analyses clearly showed that impermeable SR slopes result in smaller critical rainfall than permeable GN and GR slopes do, indicating a relatively high occurrence exceedance probability and susceptibility to landslides in SR slope. These findings suggest that geological conditions, particularly the relatively high susceptibility of SR slopes, should be considered when establishing rainfall information-based landslide warning criteria for South Korea. Our findings can contribute to the assessment of landslide susceptibility and probability based on geological conditions; however, they should be further investigated through in situ observations.
ISSN:2073-4441
2073-4441
DOI:10.3390/w14132051