新中橫公路沿線地質災害之研究─(總計畫及子計畫一)新中橫公路沿線地質環境之特性(Ⅲ)
Other Title
The characteristics of geological environment along the New East-West cross highway (III)
Date Issued
2000
Date
2000
Author(s)
DOI
892116M002020
Abstract
By an onsite investigation, the largest
debris flow in Taiwan’s history is analyzed in
this paper. A heavy rainfall of 1748 mm/day
occurred during typhoon Herb in the Hoser
area at the end of July 1996. Aerial photo
assessment and observations of geological
and geomorphological features have
contributed to our understanding of this
massive destruction. Mechanisms of the
hazardous debris flow are explored and
discussed.
Data revealed that the rock
discontinuities were a major factor in the
voluminous loose materials in the debris
flows. The heavy and rapid rainfall instantly
transported massive amounts of debris flow
materials into the center and then quickly
funneled them to the lower parts of gullies.
The heavy slurry became an effective cutting
device to erode the sidewalls and move large
quantities of the debris materials to the end
of the gullies.
Subjects
hazard
debris flow
discontinuity
geomorphology
Publisher
臺北市：國立臺灣大學地質科學系暨研究所
Type
report
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