TITLE:
Spatial Variation of Soil Depth and Shallow Slope Failures in Sangun Mountains, Fukuoka Prefecture, Japan
AUTHORS:
Hendra Pachri, Yasuhiro Mitani, Hiro Ikemi, Wenxiao Jiang
KEYWORDS:
GIS, Sangun Mountains, Soil Depth, Slope Failures
JOURNAL NAME:
International Journal of Geosciences,
Vol.6 No.8,
August
7,
2015
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 Dietrichet 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.