气候变化领域集成服务门户(CCPortal): Impact of Fluidized Granular Flows into Water: Implications for Tsunamis Generated by Pyroclastic Flows

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DOI	10.1029/2019JB018954
	Impact of Fluidized Granular Flows into Water: Implications for Tsunamis Generated by Pyroclastic Flows
	Bougouin A.; Paris R.; Roche O.
发表日期	2020
ISSN	21699313
卷号	125 期号:5
英文摘要	Novel laboratory experiments of fluidized granular flows entering water are reported, for the purpose of investigating tsunamis generated by pyroclastic flows. Qualitatively, the impact of a fluidized granular flow into water leads to (i) an initial vertical granular jet over water, (ii) a leading and largest wave, and (iii) a turbulent mixing zone forming a turbidity current. The present study focuses on the leading wave features in the near-field region, as a function of the mass flux per width qm and the volume per width υ of the flow, the maximum water depth Ho, and the slope angle θ of the inclined plane. The obtained waves are of Stokes and cnoidal types, for which the generation is mostly controlled by qm and υ. By contrast, Ho plays no role on the wave generation that occurs in the shallowest region. Moreover, a comparison between fluidized granular, dry (nonfluidized) granular, and water flows entering water is addressed under similar flow conditions. The dimensionless amplitude scales as A/Ho=f(ζ), where (Formula presented.) is a dimensionless parameter depending on the Froude number Fr, the relative slide thickness S, the relative mass M, and the slope angle θ. Data of fine fluidized granular, fine dry granular, and water flows collapse on a master curve, which implies that the nature of the flowing material is of lesser importance in the current setup. By contrast, coarse granular flows generate lower amplitude waves, which is attributed to the penetration of water into the porous granular medium. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	fluidized granular flow; pyroclastic density current; Tsunami
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187834
作者单位	Université Clermont Auvergne, CNRS, IRD, OPGC, Laboratoire Magmas et Volcans, Clermont-Ferrand, France
推荐引用方式 GB/T 7714	Bougouin A.,Paris R.,Roche O.. Impact of Fluidized Granular Flows into Water: Implications for Tsunamis Generated by Pyroclastic Flows[J],2020,125(5).
APA	Bougouin A.,Paris R.,&Roche O..(2020).Impact of Fluidized Granular Flows into Water: Implications for Tsunamis Generated by Pyroclastic Flows.Journal of Geophysical Research: Solid Earth,125(5).
MLA	Bougouin A.,et al."Impact of Fluidized Granular Flows into Water: Implications for Tsunamis Generated by Pyroclastic Flows".Journal of Geophysical Research: Solid Earth 125.5(2020).