Experimental study on the critical breakup condition of a static armour layer

doi:10.1002/rra.3759

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Experimental study on the critical breakup condition of a static armour layer
	Wang, Qiang(1,2,); Wang, Lu 1; Wang, Tao 3; Yang, Kejun 1; Nie, Ruihua 1
刊名	RIVER RESEARCH AND APPLICATIONS
	2020
页码	DOI:10.1002/rra.3759
关键词	bed coarsening bed structure bed‐ load transport rate flow intensity static armour layer
ISSN号	1535-1459
DOI	10.1002/rra.3759
产权排序	3
文献子类	Article; Early Access
英文摘要	High-flow intensity over a well-developed static armour layer will significantly reduce the stability of a riverbed. However, the intensity at which the static armour layer would completely break is not known. In this study, laboratory flume experiments were conducted to analyze the response of the static armour layer to high-flow intensity. The static armour layer was developed under the condition of steady flow with no supply of sediments. The flow intensity was increased by increasing the flow discharge, and the bed-load rate was determined to evaluate whether the static armour layer broke. The observations indicate that when the bed shear stress is low (<1.2 times the initial bed shear stress of the pre-armoured bed), the bed-load transport rate is low and the mobility of the static armour layer is constrained. However, when the bed shear stress increases to 1.2 times the initial bed shear stress, the bed-load transport rate increases, and the mobility is significantly promoted, indicating that the layer is broken. In our experiments, the characteristic particle sizes of the bed, D-50 and D-84, changed slightly before the static armour layer was broken, which signified that the composition of the riverbed slightly changed. However, the effect of the bed structure gradually increases with the increase in the flow intensity, leading to a 20% increase in the stability threshold of the static armour layer. In addition, the time to re-form the new static armour layer after the destruction of the old one was observed to be positively correlated with flow intensity. However, further research must be conducted on the threshold of the damage of the static armour layer.
电子版国际标准刊号	1535-1467
语种	英语
WOS记录号	WOS:000596803400001
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/54928]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者	Nie, Ruihua
作者单位	1.State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources & Hydropower, Sichuan University, Chengdu, Sichuan, China; 2.Key Laboratory of Yellow River Sediment of the Ministry of Water Resources, Yellow River Institute of Hydraulic Research, Zhengzhou, Henan, China; 3.Institute of Mountain Hazards and Environment, CAS, Chengdu, Sichuan, China
推荐引用方式 GB/T 7714	Wang, Qiang,Wang, Lu,Wang, Tao,et al. Experimental study on the critical breakup condition of a static armour layer[J]. RIVER RESEARCH AND APPLICATIONS,2020:DOI:10.1002/rra.3759.
APA	Wang, Qiang,Wang, Lu,Wang, Tao,Yang, Kejun,&Nie, Ruihua.(2020).Experimental study on the critical breakup condition of a static armour layer.RIVER RESEARCH AND APPLICATIONS,DOI:10.1002/rra.3759.
MLA	Wang, Qiang,et al."Experimental study on the critical breakup condition of a static armour layer".RIVER RESEARCH AND APPLICATIONS (2020):DOI:10.1002/rra.3759.