THE BREAKUP OF ARMOR LAYER IN A GRAVEL-BED STREAM WITH NO SEDIMENT SUPPLY
Mountain gravel-bed rivers typically display a surface layer that is armored. The armored surface layers form at low flows, but there is little evidence of their condition during floods, when significant hydraulic and ecologic disturbance occurs. Some flume experiments have been used to conclude that armor layers wash out during floods, although other experiments have produced a persistent armor layer. We conducted two runs of flume experiments to study the breakup of armor layers under the condition of no sediment supply. In the two runs of flume experiments, armor layers were formed at low-flow, and then continuously to increase the flow with a small range. Through observing the phenomenon of the experiments and measuring the bed-load transport, we have found that the armor layer would not always be broken up if the flow is higher than the formative flow, unless the flow increases to a certain degree.
breakup armor layer gravel bed bedload transport
Tao Wang Xingnian Liu
State Key Lab.Of Hydraulic & Mountain River Eng., Sichuan Uni., Chengdu 610065, China State Key Lab.of Hydraulic & Mountain River Eng., Siehuan Uni., Chengdu 610065, China
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
919-923
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）