气候变化领域集成服务门户(CCPortal): Experimental Insights on the Propagation of Fine-Grained Geophysical Flows Entering Water

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DOI	10.1029/2020JC016838
	Experimental Insights on the Propagation of Fine-Grained Geophysical Flows Entering Water
	Bougouin A.; Roche O.; Paris R.; Huppert H.E.
发表日期	2021
ISSN	21699275
卷号	126 期号:4
英文摘要	Granular flows that propagate down a mountainside, then reach the sea, a lake or a river and finally, travel underwater, is a common event on the Earth's surface. To help the description of such events, laboratory experiments on gas-fluidized granular flows entering water are performed, analyzed, and compared to those propagating in air. The originality of this study lies in the fluidization process, which improves the laboratory modeling of geophysical flows by taking their high mobility into account. Qualitatively, the presence of the water body promotes the generation of a granular jet over the water surface, a leading and largest wave, and a particle-driven gravity current underwater. Hydrodynamic forces mainly play a dissipative role by slowing and reducing the spreading of the granular mass underwater, but a low amount of grains are still transported by the turbulent fluid as a gravity current far away. The temporal evolution of the granular jet and the particle-driven gravity current are well described by ballistic motion theory and scaling laws of homogeneous gravity currents, respectively. Most currents propagate with a constant flow-front velocity along the horizontal bottom, which is controlled by the flow height depending on the water depth. In contrast, the bulk volume concentration of particles in the current is estimated to be nearly constant, interpreted as a critical concentration above which the excess of particles cannot be maintained by the turbulent fluid. This experimental study highlights the complexity of the dynamics and deposits of granular masses when they encounter a water body. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	fluidization process; geophysical flows; granular media; gravity currents; laboratory experiments; tsunamis
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186390
作者单位	Université Clermont Auvergne, CNRS, IRD, OPGC, Laboratoire Magmas et Volcans, Clermont-Ferrand, France; Institute of Theoretical Geophysics, King's College, University of Cambridge, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Bougouin A.,Roche O.,Paris R.,et al. Experimental Insights on the Propagation of Fine-Grained Geophysical Flows Entering Water[J],2021,126(4).
APA	Bougouin A.,Roche O.,Paris R.,&Huppert H.E..(2021).Experimental Insights on the Propagation of Fine-Grained Geophysical Flows Entering Water.Journal of Geophysical Research: Oceans,126(4).
MLA	Bougouin A.,et al."Experimental Insights on the Propagation of Fine-Grained Geophysical Flows Entering Water".Journal of Geophysical Research: Oceans 126.4(2021).