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The influence of temporal and spatial variations on phase separation in debris flow deposition

  • Fei Wang
  • Jiading WangEmail author
  • Xiaoqing Chen
  • Jiangang Chen
Original Paper
  • 127 Downloads

Abstract

The phase separation mechanism in a natural debris flow as a solid-liquid mixture is an important aspect in its movement and deposition. In this paper, the relationship between debris flow discharges and densities is studied based on the field observations of the Jiangjia Gully, China. A number of experiments are conducted to study the phase separation mechanism of debris flows, and the characteristics of their depositions over deceleration baffles with varying flow density and bottom slopes. The phase separation mechanism of natural debris flows is analyzed based on the mentioned experimental and field observations. During the decreasing debris flow, the flow density reduces with reduction of the flow discharge, indicating the important role of the flow discharge in changing the flow density as a driving factor. Temporal variations of the debris flow density can have two chronological orders: (a) dilute-viscous-dilute debris flow and (b) viscous-dilute debris flow. The variation order of the flow density has an important influence on the phase separation mechanism and the final deposition morphology. The experimental results show that the bottom slope and the flow density have opposite effects on the phase separation mechanism. Increasing the flow density increases the viscosity of the debris flow, decreasing the phase separation of the solid-liquid mixture. Increasing the bottom slope promotes phase separation by increasing the shear rate inside the debris flow. As a result, the phase separation mechanism of natural debris flow is mostly related to the temporal and spatial variations of the flow pattern and the flow density.

Keywords

Debris flow Peak discharge Flow density Experimental analysis Deceleration baffles 

Notes

Acknowledgements

We would like to thank the editor-in-chief Professor Sassa and two anonymous reviewers for their valuable comments, which greatly improved the manuscript.

Funding information

This study is supported and funded by the National Natural Science Foundation of China (Grant No. 41630639, 41807252), the National Key Research and Development Plan (Grant No. 2018YFC1504703), the International Cooperation and Exchange of the National Science Foundation of China (Grant No. 41661144028), and the Project funded by China Postdoctoral Science Foundation (Grant No. 2018M633558).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Continental Dynamics, Department of GeologyNorthwest UniversityXi’anChina
  2. 2.CAS Key Laboratory of Mountain Hazards and Earth Surface Process, Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengduChina

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