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─(子計畫二)控制邊坡演育的地形作用及其環境閾值條件
Date Issued
2000
Date
2000
Author(s)
徐美玲
DOI
892116M002025
Abstract
The study site is located upon the Fu-
Bu-Ur Terrace at the Lan-Yang His
watershed. Rainfall and soil moisture of four
observation holes were continuously
monitored from 1998 to 2000. 43 rainfall
events with good soil moisture data were
selected for further analysis. Total rainfall
amount, average rainfall intensity, the
maximum duration and the maximum rainfall
of the within-storm raining periods, and the
maximum hourly rainfall intensity of each
rainfall events and the corresponding soil
moisture variations were compared. The soil
moisture fluctuation patterns among different
observation holes and among different depths
appeared to be extremely complicated. The
average rainfall intensity, the maximum
duration of the within-storm raining periods
and the maximum hourly rainfall intensity of
the rainfall events which significantly raised
soil moisture were statistically greater than
those of the other rainfall events. Variability
in soil moisture responses among different
observation holes and depths were very
likely due to local variations in soil texture,
structure and/or bio-activities. The study
showed that 16 consecutive rainless days
significantly lowered the soil moisture in all
observation holes, while long-lasting rainfall
or large maximum hourly rainfall intensity
seemed to contribute to the saturation of the
whole soil columns. Thus, further study of
the maximum duration of the within-storm
raining periods and the maximum hourly
rainfall intensity of the storms which have
caused landslides in the study area should be
conducted in order to estimate the threshold
magnitudes of landslide-triggering storms
more effectively.
Subjects
terrace
soil moisture content
rainfall intensity
rainfall duration
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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