行政院國家科學委員會專題研究計劃成果報告:斜坡地形演化與地形定年─(子計畫二)控制階地邊坡演育的地形作用及其環境閾值條件
Date Issued
1998
Date
1998
Author(s)
徐美玲
DOI
872116M002004
Abstract
Terraces are commonly found in many
places in Taiwan which when correctly dated
will provide very good datum for
geomorphological evolution in different part
of the island. Geomorphic dating of terrace
formation has been proposed by Song et al.
(1993, 1995). In the method diffusion model
was used to simulate the evolution of a
terrace scarp. However, many processes
contribute to terrace scarp evolution, it is
necessary to investigate the magnitude and
significance of each geomorphic process.
This project conducted a field survey on the
terrace scarp of Fu-Bu-Er Terrace at the midsection
of Lan-Yang Chi. In the meanwhile, a
small observation plot located in a small
alluvial fan and covered by bamboo woods
was selected. 36 automatic recording
piezometers and 2 tensiometers, together
with one rain gauge outside, and the other
inside the bamboo woods were set up for
monitoring the hydrological responses of
shallow soil layers. It was found that
throughfall inside the bamboo woods only
took place when rainfall within half an hour
exceeded 1.5mm. Soil moisture is wetter at
the downslope location. But soil saturation
has never been detected. It is likely that
either the perched groundwater layer took
place in a much deeper layer, or the rain
intensity observed was not large enough to
cause saturation in shallow soil layers.
Terrace scarp profile survey revealed that
slope gradient is significantly affected by
vegetation cover. Also, terrace scarps tended
to be steeper than talus slopes.
Subjects
terrace
slope evolution
geomorphological dating
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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