Abstract
ABSTRACTShallow landslides triggered by heavy rainfall are common phenomena in mountainous areas of temperate monsoon regions. On July 2006 intensive shallow landslides occurred in Jinbu area, Korea triggered by heavy rainfall. An inventory of 1412 shallow landslides was constructed from intensive field works and interpretation of web-based aerial photographs, and all landslides detected were mapped across the study area. The measurements were geometrical properties (landslide length, landslide width, landslide depth) of individual landslides to establish the relationship linking landslide area to landslide volume. The relationship linking landslide area to landslide volume was obtained from the inventory of 930 landslides and is a power law function with a scaling exponent γ = 1.02, covers four orders of magnitude of landslide area and landslide volume, and is in reasonable agreement with existing relationships obtained from small scale shallow landslide events. The relationship can be used to estimate the volume of individual landslides with shallow soil depth when the area of landslide is known. However, geological and geomorphological setting should be considered to calculate accurate landslide volume with respect to disaster prevention.
Highlights
Landslides are complex natural phenomena in temperate monsoon climate regions, and often occur in mountain areas during high magnitude storms (Chen et al 2011; Kim et al 2012)
Preliminary studies investigated landslide susceptibility and causal factors affecting landslide distribution (Park et al 2017) in Jinbu area. This current study describes an inventory of 1412 shallow landslides with respect to geometrical properties of individual landslides
All mapped landslides were soil-based landslides (Park et al 2017) according to the subdivision of Larsen et al (2010). This power law relationship can be used to estimate the volume of individual landslides with shallow soil depth when the area of landslide is known
Summary
Landslides are complex natural phenomena in temperate monsoon climate regions, and often occur in mountain areas during high magnitude storms (Chen et al 2011; Kim et al 2012). These landslides are major natural soil disasters resulting in substantial economic, social, and geomorphologic impacts in many countries (Guthrie 2002; Schwarz et al 2010). The high magnitude storms cause frequent shallow landslides and debris flows triggered by heavy rainfall during summer monsoon rainy season in Korea (Park et al 2017). Estimating the volume of slope failures for a large number of landslides in an area is an even more challenging task (Malamud et al 2004)
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