HASNAWIR and KUBOTA
Abstract
This study aims to determine empirical rainfall intensity]duration thresholds
for landslides and debris flow and to find standard rainfall warning for debris
flow overflows in Mt. Bawakaraeng Caldera, Indonesia. The debris flow overflow
happens when excess sediment (debris) flows over the top of channel works and
check dams. The study is based on the hourly]rainfall data recorded from 1997
to 2007. The threshold, as defined by the lower boundary of the points representing
landslides and debris]triggering rainfall events, is expressed as I=41.85D|0.85
before the large scale landslide on March 26,2004 and I=‚R‚V.‚V‚PD|0.‚X‚O after the
large scale landslide, where I is the rainfall intensity (mm/hr) and D is the
duration of rainfall (hr). The Debris flow overflow warning in the study area
may be issued when rainfall is expected to exceed the warning line.
Key wordsFMt. Bawakaraeng Caldera, rainfall threshold, rainfall intensity, sediment
disaster, warning