河床質特性對防砂壩下河床局部沖刷之影響

Effect of Bed Material Characteristics on Local Scour Below a Check Dam

蘇重光(Chong-Guang Su) ； 葉再麟(Zai-Lin Ye)

《中華水土保持學報》 29卷1期 (1998/03) Pp. 79-85

https://doi.org/10.29417/JCSWC.199803_29(1).0008

摘要

本研究旨在探討河床質特性（亦即河床質大小及河床質分散度）對防砂壩下河床局部沖刷之影響。河床質大小係以中值粒徑d_(50)表示，河床質分散度則以河床質幾何標準偏差σ_g（=√d_(84)/d_(16)）來代表。經水工試驗，得知沖刷深度與河床質中值粒徑及幾何標準偏差成反比。另外，根據相關理論及因次分析並配合試驗結果，可得一防砂壩下相對最大平衡沖刷深度之方程式。

關鍵字

河床質中值粒徑 ； 河床質幾何標準偏差 ； 防砂壩 ； 局部沖刷

並列摘要

The study is to investigate the effect of bed material characteristics (i. e. particle size and particle-size distribution) on local scour below a check dam. in which the particle size is expressed by the median particle diameter, d_(50)and particle-size distribution is shown by the geometric standard deviation of particle size, σ_g（=√d_(84)/d_(16)）. The maximum equilibrium scour depth is reversely proportional to median particle diameter and geometric standard deviation of particle size. The dimensionless maximum equilibrium scour depth formula is developed by making use of theoretic reasoning, dimensional analysis and experimental data.

並列關鍵字

Median Particle Diameter ； Geometric Standard Deviation of Particle Size ； Local Scour ； Check Dam