行政院國家科學委員會專題研究計畫成果報告─921大地震崩塌地對河川輸砂衝擊之研究
Date Issued
2001
Date
2001
Author(s)
徐美玲
DOI
892116M002052
Abstract
On September 21, 1999, an earthquake
with a magnitude of 7.3 at the Richter’s scale
took place in central Taiwan. This earthquake
induced numerous landslides with total area
over 8000 hectares. Since many landslides
took place in the Ninety-Nine-Peaks area, it
deserves our close inspection for further
understanding landslides characteristics and
their contribution to river sediment yield.
This proposed study is a 3-year project.
The research is focused on field investigation
this year, especially on the observation and
documentation of the location, morphology
of each landslides, and of the characteristics,
transportation and deposition of the landslide
material. Preliminary research shows that
debris fall, debris slide, slope-typed debris
flow and valley-typed debris flow are the
four major types of mass movement in the
study area. Debris falls and debris slides
usually occur adjacent to valley divides,
while slope-typed debris flows occur on
concaved steep slopes, and valley-typed
debris flows develop in small tributary
valleys. The sliding mass from debris falls
and debris slides seldom reaches river
channels unless they are adjacent to the
channels. Slope-types debris flows move
considerable earth mass, but the material
usually stays in the slope foot. Only the
valley-typed debris flows could contribute
significant sediment to river channels
effectively
Subjects
the 921 Earthquake
landslides
fluvial sediment transport
River channel change
Publisher
臺北市：國立臺灣大學地理環境資源學系暨研究所
Type
report
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