Dynamics of loose granular flow and its subsequent deposition in a narrow mountainous river

doi:10.1007/s11629-018-5080-5

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 > Journal of Mountain Science > Journal of Mountain Science-2019 > Vol16 No.6

	Dynamics of loose granular flow and its subsequent deposition in a narrow mountainous river
	Lei Ming; Xu Ze-xing; Zhao Tao; Wang Xie-kang
刊名	JOURNAL OF MOUNTAIN SCIENCE
	2019
卷号	16 期号:6 页码:1367-1380
关键词	Loose debris materials Sediment supply CFD-DEM coupling method Numerical simulations
ISSN号	1672-6316
DOI	10.1007/s11629-018-5080-5
文献子类	Article
英文摘要	A large amount of loose debris materials were deposited on the slope of mountainous areas after the 2008 Ms 8.0 Wenchuan earthquake. During and after the earthquake, these loose debris deposits collapsed and slide into valleys or rivers, changing river sediment supply condition and channel morphology. To investigate the mechanisms of granular flow and deposition, the dynamics of slope failure and sediment transportation in typical mountainous rivers of different intersection angles were analyzed with a coupling model of Computational Fluid Dynamics and Discrete Element Method (CFD-DEM). The numerical results show that the change of intersection angle between the granular flow flume and the river channel can affect the deposit geometry and the fluid flow field significantly. As the intersection angle increases, the granular velocity perpendicular to the river channel increases, while the granular velocity parallel to the river channel decreases gradually. Compared to the test of dry granular flow, the CFD-DEM coupling tests show much higher granular velocity and larger volume of sediments entrained in the river. Due to the river flow, particles located at the edge of the deposition will move downstream gradually and the main section of sediments deposition moves from the center to the edge of the river channel. As a result, sediment supply in the downstream river will distribute unevenly. Under the erosion of fluid flow, the proportion of fine particles increases, while the proportion of coarse particles decreases gradually in the sediment deposition. The build-up of accumulated sediment mass will cause a significant increase in water level in the river channel, thus creating serious flooding hazard in mountainous rivers.
电子版国际标准刊号	1993-0321
语种	英语
WOS记录号	WOS:000471607300011
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/46515]
专题	Journal of Mountain Science_Journal of Mountain Science-2019_Vol16 No.6
推荐引用方式 GB/T 7714	Lei Ming,Xu Ze-xing,Zhao Tao,et al. Dynamics of loose granular flow and its subsequent deposition in a narrow mountainous river[J]. JOURNAL OF MOUNTAIN SCIENCE,2019,16(6):1367-1380.
APA	Lei Ming,Xu Ze-xing,Zhao Tao,&Wang Xie-kang.(2019).Dynamics of loose granular flow and its subsequent deposition in a narrow mountainous river.JOURNAL OF MOUNTAIN SCIENCE,16(6),1367-1380.
MLA	Lei Ming,et al."Dynamics of loose granular flow and its subsequent deposition in a narrow mountainous river".JOURNAL OF MOUNTAIN SCIENCE 16.6(2019):1367-1380.