摘要
针对山区卵石河道普遍存在的床面粗化层现象,进行了水流强度连续小幅增大的清水冲刷粗化层破坏试验研究,旨在探讨粗化层破坏与水流强度之间的临界关系。试验结果表明,水流强度的增大并不一定能破坏床面粗化层,只有当水流强度增大到一定程度时,粗化层才会破坏。对于本系列试验所用泥沙,只有床面切应力大于初始粗化床面切应力的1.2倍,粗化层才会破坏。粗化层床面结构对粗化床面切应力有着重要的影响。
Mountain river s beds are usually covered by armor layer.In this paper,the flume experiments are conducted to study the critical condition of armor layer s breakage,by the increasing intensity of flow with a little range in the experiment.The experiments result indicates that the armor layer could not be broken until the intensity of flow incerases to a certain degree.As to the sediment used in the paper s experiment,only the bed shear stress increases to1.2 times of the bed shear stress of incipient armor ...
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2008年第4期36-40,共5页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(50579041)
关键词
粗化层破坏
水流强度
床面切应力
推移质输沙率
breakage of armor layer
intensity of flow
bed shear stress
bed-load transport rate
