Specific condition in slope failures happening sporadically and the setting
of critical line
Kotaro MATSUMOTO, Hiroshi MOTOHISA, Hiroyuki OHISHI and Kohei FURUKAWA
Abstract
For the non]structural measures of erosion control works, the improvement of accuracy
in speculating slope failure generated in a concentrated manner has been advanced
with improved technology in setting the critical line (CL) . However, speculating
method for the slope failure generated within the safety zone of the set CL, known
as the sediment]related disaster sporadically generated, still shows little improvement.
Therefore, disability of warnings and evacuation was assumed to be the key in
disaster prevention. In this study, we worked on the specifications of the slope
failures sporadically generated, using the rough sets, at the southern part of
Shimonoseki City where danger of slope failure is relatively high comparing with
other regions in Japan. In addition, the setting of CL for region with more possible
warnings and evacuation information was attempted not only on concentrated occurrence
but also on the one sporadically generated in a specific region.