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DEVELOPMENT OF STEP-POOL SEQUENCE AND ITS EFFECTS IN RESISTANCE AND STREAM BED STABILITY
被引：15
作者：
ZhaoYin WANG Jiang XU and Changzhi LI Professor Dept of Hydraulic Engineering Tsinghua University Beijing Chairman of Advisory Council International Research and Training Center on Erosion and Sedimentation China Email zywangtsinghuaeducnM Phil Dr Post Doctorate research fellow Dept of Hydraulic Engineering Tsinghua University Beijing China
[100084
,100084
]
机构：
关键词：
Step-pool;
Streambed stability;
Erosion;
Resistance;
Rate of energy dissipation;
Manning’s roughness n;
D O I：
暂无
中图分类号：
TV147 [河道演变];
学科分类号：
081502 ;
摘要：
<正> Experiments were conducted and field investigations were performed to study the development of step-pool sequence and its effects on resistance to the flow and stream bed stability. Step-pool sequence develops in incised channels as a result of streambed erosion, which is compared with sand dunes and armor layer of the role in resistance and streambed protection. The tight interlocking of particles in steps gives them an inherent stability which only extreme floods are likely to disturb. That stability suggests that step-pools are a valid equilibrium form, especially when coupled with their apparent regularity form and their role in satisfying the extreme condition of resistance maximization. The development degree of step-pools, SP, is proportional to the streambed slope. If the incoming sediment load is equal to or more than the sediment-carrying capacity of the flow, there is no bed erosion and thence there are no step-pools. If the flow depth increases and is over the step-height the resistance caus
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页码：161 / 171
页数：11
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