土石流剖面流速分布之研究

STUDY ON THE VELOCITY DISTRIBUTION OF DEBRIS FLOW

蘇重光(Chong-Guang Su) ； 連惠邦(Hui-Pang- Lien) ； 江永哲(Yung-Cheh Chiang)

《中華水土保持學報》 24卷1期 (1993/05) Pp. 75-82

https://doi.org/10.29417/JCSWC.199305_24(1).0009

摘要

本研究係利用混合流層模式以模擬在穩定均匀流動條件下土石流的流速分布。混合流層模式主要提出一個新的觀念，卽土石流在泥砂體積濃度很高的時候，沿著縱剖面的泥砂顆粒均承受離散應力作用外，在河床面附近可能存在一粘性層，層內泥砂顆粒散受粒間摩擦阻力之影響。經利用其他研究者之實測資料，證實以混合流層模式所推得之流速分布與實測流速資料十分接近，而優於其他模式。

關鍵字

混合流層模式 ； 土石流 ； 流速分布

並列摘要

A mixed-layer model can be used to simulate the velocity profile of debris flow under steady and uniform flow conditions. This model is deduced from an idea that the particles are no only dispersed throughout the entire depth but also concentrated more in the lower part of the flow under comparatively high solid concentration, and below the particle dispersive layer a macro-viscous layer appeares which may contain inter-particle friction drag. Theoretical velocity profiles are checked with some researchers' experimental data. It is found that the agreement is assuring and looks better than other equations for the velocity distribution.

並列關鍵字

Mixed-Layer Flow Model ； Debris Flow ； Velocity Distribution