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DEVELOPMEnT OF sTEP-POOL sEQUEnCE AnD ITs EFFECTs In REsIsTAnCE AnD sTREAM BED sTABILITY

International Journal of sediment Research 2004年第3期19卷 161-171页

作者： Zhao-Yin 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, 100084, China, Email: zywang@***.M. Phil., Dr. & Post Doctorate research fellow, Dept. of Hydraulic Engineering, Tsinghua University, Beijing, 100084, China Dept. of Hydraulic Engineering Tsinghua University Beijing & Chairman of Advisory Council International Research and Training Center on Erosion and Sedimentation 100084 China Dr. & Post Doctorate research fellow Dept. of Hydraulic Engineering Tsinghua University Beijing 100084 China

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

关键词： step-pool streambed stability Erosion Resistance Rate of energy dissipation manning’s roughness n

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