HR: 0800h
AN: H11C-0664 [Abstracts]
TI: Estimation method of slip surface by ground surface displacement
AU: * Ishida, K
EM: k-ishida@pwri.go.jp
AF: Erosion and Sediment Control Research Group, Public Works Research Institute, 1-6
Minamihara, Tsukuba, Ibaraki, 305-8516, Japan
AU: Fujisawa, K
EM: fujisawa@pwri.go.jp
AF: Erosion and Sediment Control Research Group, Public Works Research Institute, 1-6
Minamihara, Tsukuba, Ibaraki, 305-8516, Japan
AU: Kojima, S
EM: kojima-s92ta@nilim.go.jp
AF: Research Center for Disaster Risk Management, National Institute for Land and
Infrastructure Management, Asahi 1, Tsukuba, Ibaraki, 305-0804, Japan
AU: Tanaka, H
EM: h-tana44@pwri.go.jp
AF: Erosion and Sediment Control Research Group, Public Works Research Institute, 1-6
Minamihara, Tsukuba, Ibaraki, 305-8516, Japan
AB:
After a landslide has occurred, it is important to take emergency countermeasures as soon as possible to
prevent the damage from worsening. To do this, it is necessary to quickly identify the characteristics and size of
movement of the landslide. However, conventional methods such as investigating the slip surface by taking core
samples and monitoring the movement of land mass using vertical boring holes is time-consuming and involves
risk, as the work must be carried out directly on the unstable landslide.
This paper introduces a method of estimating the depth of the landslide slip surface using by ground surface
displacement. The method involves dividing the landslide block and deriving a formula that approximates the line
of the slip surface. Inputs for this method include the lengthwise section of the ground surface, displacement of
ground surface, points of the scarp and tip of the landslide. We applied this method to several landslides and
proved that the slip surface estimated by this method closely matched the actual surface determined by
conventional methods, provided that measuring points were properly arranged.
The results suggest that this method can estimate the slip surface of landslides. In future, it is necessary to
improve systems of monitoring active landslide masses and methods of estimating their size in a quick, easy,
and reliable manner to be practically applicable to disaster areas.
DE: 1810 Debris flow and landslides
DE: 1816 Estimation and forecasting
SC: Hydrology [H]
MN: 2007 Fall Meeting