行政院國家科學委員會專題研究計畫成果報告-中橫公路崩山災害研究
Date Issued
2005
Date
2005
Author(s)
DOI
932116M002033
Abstract
It is well-established that landslides are
extensively triggered as a result of large seismic
events in upland areas. These landslides are
known to release sediments into the fluvial
system, although there is contradictory evidence
about how quickly this makes its way into the
main channels. Some authors have postulated
that sediment moves through the drainage
system as a ‘slug’, whilst others have noticed
only limited impact as material remains stored
in the drainage basin. What has almost never
been addressed is the continued evolution of the
landslides themselves after the seismic event,
and their continued role in releasing slope
materials. This paper examines the Tachia River
basin in western Taiwan, which was extensively
affected by landslides during the 1999 Chi-Chi
earthquake. Using vertical cartographic aerial
photographs and satellite images, this study
demonstrates that the area affected by landslides
increased substantially after the main
earthquake as a result of high intensity rainfall
events. Analysis of suspended sediment data
from downstream of the area affected by
landslides, show that sediment concentration
steadily increases with time, in the period after
the initialization of slope movements. A simple
model in which sediment production increases
immediately after the earthquake and then
steadily reduces through time appears to be over
simplistic, and should be replaced by a model
that incorporates complex responses to the
initial and subsequent events.
Subjects
DTM
Landslides evolution
Central Cross Island Highway
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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