行政院國家科學委員會專題研究計畫成果報告:斜坡地形演化與地形定年研究─(子計畫二)控制階地邊坡演育的地形作用及其環境閾值
Date Issued
1999
Date
1999
Author(s)
徐美玲
DOI
882116M002016
Abstract
Research on terrace slope evolution
helps to clarify the relationship between
slope form and geomorphological processes,
and is essential to geomorphological dating
of terraces. The Fu-Bu-Er terrace located in
the Lang-Yang -Chi is chosen as the study
site. The terrace slopes are delineated into
homogeneous units, and the geology,
surfacial gradient, erosion, vegetation
conditions of each unit are carefully observed
and recorded. The collected data are then
classified according to material type,
morphological characteristics and working
processes. Further statistical analyses are
performed in order to postulate the
relationships between slope form and
environmental factors. The author
concludes that the geology of terrace slopes
is the most significant factor in controlling
slope gradient. Field observations reveal that
the free scarp slope retreats by periodic
rockfalls and debris slumps, thus, no definite
relationship exists between slope gradient
and the age of the slope. Debris slopes
beneath free scarp faces are subjected to
creeping, rain splash, and soil erosion, and
then start to reduce their gradients. However,
when the free scarp face above any debris
slope fails, new material adds to increase the
height and gradient of the debris slope. As
long as the free scarp face exists, the gradient
of the debris slope will fluctuate, but will not
diminish with time. As a result, the diffusionbased
slope evolution model is not apt to
simulate slope change or to estimate the age
of the slope.
.
Subjects
slope evolution
terrace dating
free scarp face
debris slope
diffusion model
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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