卵石河床清水冲刷粗化层破坏临界条件试验研究
Experimental Study on the Critical Condition of Armored Layer’s Breakage
作者：王涛(四川大学 水力学与山区河流开发保护国家重点实验室，四川 成都 610065)；刘兴年(四川大学 水力学与山区河流开发保护国家重点实验室，四川 成都 610065)；黄尔(四川大学 水力学与山区河流开发保护国家重点实验室，四川 成都 610065)
Author：(State Key Lab. of Hydraulic & Mountain River Eng., Sichuan Uni., Chengdu 610065, China)；(State Key Lab. of Hydraulic & Mountain River Eng., Sichuan Uni., Chengdu 610065, China)；(State Key Lab. of Hydraulic & Mountain River Eng., Sichuan Uni., Chengdu 610065, China)
收稿日期：2007-12-19 年卷（期）页码：2008,40(4):36-40
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：粗化层破坏；水流强度；床面切应力；推移质输沙率
Key words：breakage of armor layer; intensity of flow; bed shear stress; bed-load transport rate
基金项目：国家自然科学基金资助项目(50579041)
中文摘要
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。
英文摘要
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 layer, that the armor layer is broken. The structure of bed armor layer has important influence to the bed shear stress of armor layer.
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