沙丘床形之三維多顆粒泥砂躍移研究(II)
Date Issued
2005
Date
2005
Author(s)
DOI
932211E002025
Abstract
A series of studies regarding the two
dimensional collision mechanism with the channel
bed and among the saltating particles were
conducted by Garcia and Nino (1994, 1998) and
our group (Chen 1998, You 1999). The
simulation results are satisfactory. For past years,
our group (Lin 2000, Lee 2001, Wang 2002) had
extended the experiments to three dimensional
conditions. The bed forms of our previous
experiments were flat bed and formed by uniformly
distributed sediment particles. However, the bed
forms in natural rivers vary with different flow
conditions. Different types of bed forms, were
observed, namely, flat bed, ripple, dune, antidune,
and chutes and pools. Particles saltation
characteristics will definitely be different under
different bed formation. The purpose of this study
is to investigate the three dimensional saltation
characteristics on a dune bed, with special attention
on the collision behaviors between the saltating
particles and the channel bed and interparticle
collision behaviors. A three dimensional flow
visualization technique will be modified and
upgraded in this study to measure the three
dimensional saltation trajectories on a dune bed.
Basing on these data, a two dimensional saltation
model for single sediment particle will then be
developed. This model will be very helpful in the
study of bed load transport.
Subjects
Bed load
Saltation
2-D flow visualization technique
Dune
Publisher
臺北市：國立臺灣大學水工試驗所
Type
report
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