Experimental preliminary analysis of the fluid drag effect in rapid and long-runout flow-like landslides

During a landslide, the multi-phase nature of landslide debris defines its mobility. Eventually, frictional forces cause the slide energy to dissipate, and contact forces transmit the energy into nearby material. Using comparative analysis which analyzes the mobility characteristics of flow-like lan...

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Bibliographic Details
Published in:Environmental earth sciences 2022-02, Vol.81 (3), Article 93
Main Authors: Gao, Yang, Gao, Haoyuan, Li, Bin, Wei, Tongyao, Li, Zhuang
Format: Article
Language:English
Subjects:
Biogeosciences
Comparative analysis
Contact force
Drag
Drag effects
Earth and Environmental Science
Earth Sciences
Environmental Science and Engineering
Flumes
Forces
Geochemistry
Geology
Hydrology/Water Resources
Kinetic energy
Landslides
Landslides & mudslides
Liquid phases
Liquids
Mobility
Multiphase
Multiphase flow
Original Article
Solid phases
Terrestrial Pollution
Two phase flow
Viscosity
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Summary:During a landslide, the multi-phase nature of landslide debris defines its mobility. Eventually, frictional forces cause the slide energy to dissipate, and contact forces transmit the energy into nearby material. Using comparative analysis which analyzes the mobility characteristics of flow-like landslides with various slide materials, we conducted flume model experiment. Our conclusions are as follows: (1) liquid-phase flow-like landslides are highly mobile and have long runout; solid-phase flow-like landslides are highly destructive because of their higher kinetic energy; and two-phase flow-like landslides are both highly mobile. (2) During a two-phase flow-like landslide, the mobility ability of the liquid-phase material is stronger than that of the solid-phase material; when the liquid slide volume fraction is sufficiently large, the liquid phase exerts a drag force on the solid phase. (3) Various liquids exert different drag effects on the solid; the solid–liquid velocity difference and the liquid viscosity determine the drag intensity and the mobility and depositional characteristics of the landslides. The results provide experimental support for the further study of the influence of multi-phase properties of flow-like landslides on the mobility characteristics of landslides.
ISSN:1866-6280
1866-6299
DOI:10.1007/s12665-022-10207-0