Abstract
Shallow slope failure is often induced by rainfall infiltration in a soil mantle overlying a less permeable bedrock. Soil depth is an important input parameter in slope stability analysis. This paper provides the spatial variation of soil depth and the occurrence of slope failure in Sangun mountains area. The spatial pattern of soil depth was simulated by proses based model using airborne laser survey data (LiDAR data) and Geographic Information System (GIS) function. As a function for soil production, we use in the study area a numerical model developed by Dietrich et al. (1995) to predict the local spatial variation of the depth of soil. The soil depth data measured at 20 locations that represent morphological variability are used as a sample data set to test the model results. Furthermore, the soil depth variations are compared to the slope failure distribution in the whole area. Slope failure locations in the study area are identified from interpretation of aerial photographs and field surveys. Fifty-five of slope failures are considered for slope failure hazard analysis. Therefore, the slope failures occur more frequently at soil depth intervals in the ranged from 1.01 m to 1.5 m.
Highlights
In the Sangun mountain, Fukuoka Prefecture, Japan, abundant slope failures occurred in 2003 [1]
A Portable Dinamic Cone-Penetrometer Test (CPT) tool was used in the measurements
The spatial distribution of soil depth was estimated using a process based model [5] and different soil depth observations to perform a simulation analysis to provide the relationship of slope failure and soil depth distribution in the upper catchment of Sangun mountains
Summary
In the Sangun mountain, Fukuoka Prefecture, Japan, abundant slope failures occurred in 2003 [1]. The assessment of the causes of slope failure occurrence is still conducted. There was no information about an influence on the type of soils on the occurrence. In the slope stability analysis, soil thickness is an im-. How to cite this paper: Pachri, H., Mitani, Y., Ikemi, H. and Jiang, W.X. (2015) Spatial Variation of Soil Depth and Shallow Slope Failures in Sangun Mountains, Fukuoka Prefecture, Japan. Shallow landsliding in soil-mantled landscapes can generate debris flows which scour low order channels, and deposit large quantities of sediment in higher order channels [2]. An active geomorphologic process is dominant, such as soil erosion and landsliding [3]
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