行政院國家科學委員會專題研究計畫成果報告:非均勻砂礫之分區可動性與啟動機率試驗研究
Date Issued
2004
Date
2004
Author(s)
DOI
922211E002089
Abstract
We investigate the fractional mobility and entrainment probability of nonuniform
sand/gravel sediment. The results reveal that
the relation between fractional mobility and
dimensionless effective shear stress is well
approximated by the cumulative lognormal
distribution, with its mean and standard
deviation linearly decreasing with sand
content for the range < 0.34. The results also
reveal that for smaller values of
dimensionless shear stress (< 0.25), the
entrainment probability increases with the
turbulence intensity, whereas for larger
values of dimensionless shear stress (> 0.25),
the entrainment probability decreases with
the increase of turbulence intensity. For
dimensionless shear stress = 0.25, the
entrainment probabilities corresponding to
different turbulence intensities consistently
remain at 0.3.
Subjects
Nonuniform sand/gravel sediment
fractional mobility
entrainment probability
sand content
turbulence intensity
Publisher
臺北市：國立臺灣大學生物環境系統工程學系暨研究所
Type
report
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