遮蔽效應對混合粒徑輸砂量之影響探討

Analysis of Armoring Effect to Mixed Grain Sediment Discharge

黃宏斌(Hung-Pin Huang) ； 吳榮瑜(Zong-Yu Wu)

《農業工程學報》 54卷2期 (2008/06) Pp. 71-80

https://doi.org/10.29974/JTAE.200806.0007

摘要

In order to explore the armoring effect to mixed-grain sediment discharge, this study; associated with Einstein's stochastic model, got the result as following: when ψ＞18.07, the same tendency of sediment transport rate occurs for both of uniform and mixed-grain sediment; while 18.07≥ψ＞2.78, the armoring effect begins to affect the sediment discharge and test points are scattered resulting from the degree of armoring effect and starling probability of sediment. As 2.78≥ψ, water shear is too large to destroy the armoring effect of surface layer resulting in same tendency and large sediment transportation for both uniform and mixed grain sediment.
In accordance with the 30 sets of experimental data and 798 data from literature, this study got a mixed-grain sediment transport model with the armoring effect and starting probability of sediment.

關鍵字

混合粒徑 ； 渠槽試驗 ； 輸砂量 ； 遮蔽效應 ； 序率

並列摘要

In order to explore the armoring effect to mixed-grain sediment discharge, this study; associated with Einstein's stochastic model, got the result as following: when ψ＞18.07, the same tendency of sediment transport rate occurs for both of uniform and mixed-grain sediment; while 18.07≥ψ＞2.78, the armoring effect begins to affect the sediment discharge and test points are scattered resulting from the degree of armoring effect and starling probability of sediment. As 2.78≥ψ, water shear is too large to destroy the armoring effect of surface layer resulting in same tendency and large sediment transportation for both uniform and mixed grain sediment.
In accordance with the 30 sets of experimental data and 798 data from literature, this study got a mixed-grain sediment transport model with the armoring effect and starting probability of sediment.

並列關鍵字

Mixed grain ； Fiume experiment ； Sediment discharge ； Armoring effect ； Stochastic