沙丘型底床泥砂顆粒躍移模式研究

翁明儀

doi:10.6342/NTU.2005.00281

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沙丘型底床泥砂顆粒躍移模式研究

Investigations of particles saltating process on dune beds

翁明儀 , Masters　　Advisor：李鴻源　　

繁體中文 DOI： 10.6342/NTU.2005.00281

推移載；躍移；碰撞機制；三維動態影像數位化系統；沙丘； Bed load ； Saltation ； 3-D flow visualization technique ； Dune

Abstract │ Reference (44) │ Altmetrics

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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.

Reference ( 44 ) 〈TOP〉

1. Abbott J.E., and Francis J.R.C., ”Saltation and Suspension Trajectories of Solid Grains in a Water Stream,” Proc. Royal Soc. London, England, Vol.284, A, 1977, pp.225-254.
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2.A. Li and G. Ahmadi. ”Dispersion and Deposition of Spherical Particles from Point Sources in a Turbulent Channel Flow.” Aerosol Science and Technology,1992, 16:209-226
連結：
3.Anderson, R.S. and Hallet, B., ”Sediment Transport by wind,”Geological Society of American Bulletin, Vol.97, 1986.
連結：
4.B. E. Launder and D. B. Spalding. ” Lectures in Mathematical Models of Turbulence,”Academic Press, London, England, 1972.
連結：
8.Engelund, F. , Hydraulic Resistance of Alluvial Streams, J.
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