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The influence of the bed entrainment-induced rheology and topography changes on the propagation of flow-like landslides: a numerical investigation

  • Wei Shen
  • Tonglu LiEmail author
  • Ping Li
  • Yueqiang Shen
  • Yulu Lei
  • Jian Guo
Original Paper
  • 64 Downloads

Abstract

Bed entrainment changes the rheology of the sliding mass and the topography of the sliding surface, finally influencing the propagation of flow-like landslides. In previous studies, both empirical methods and physically based methods have been used to simulate bed entrainment. However, the influences of bed entrainment on the rheology and topography of flow-like landslides were not deeply explored. In this paper, the physically based model proposed by Fraccarollo and Capart (J Fluid Mech 461:183–228, 2002) is adopted to calculate the bed entrainment rate, and a new method is proposed to consider the rheology change associated with bed entrainment in flow-like landslides. The new rheology change method and the Fraccarollo and Capart model are incorporated into a quasi-3D finite difference code to analyze an ideal case and two typical flow-like landslides. The two real landslides are the Dabaozi landslide and the Dagou landslide in the Chinese Loess Plateau. They represent two different bed entrainment scenarios: the erodible mass is relatively thick in the Dabaozi landslide, while that of the Dagou landslide is relatively thin. The results show that both the topography and rheology changes have a significant influence on the propagation of flow-like landslides: (1) the rheology change mainly influences the run-out distance of a landslide, while the topography change mainly impacts the lateral spreading; (2) entraining soft materials can significantly increase the run-out distance of a flow-like landslide; (3) the topography change can obviously constrain the lateral spreading of those landslides when the erodible mass is relatively thick. In addition, it shows that the rheology change and topography change influence each other in the propagation of a flow-like landslide, and the proposed rheology change method in this paper can properly reflect this interactive process.

Keywords

Flow-like landslides Numerical simulation Finite difference method Bed entrainment Run-out analysis 

Notes

Acknowledgements

The authors acknowledge the funding received from the National Key R&D Program of China (2017YFC1501302), the China Scholarship Council (CSC)–University of Bologna Joint Scholarship (file no. 201806560011), and the National Natural Science Foundation of China (no. 41877242), which supported this study.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Wei Shen
    • 1
  • Tonglu Li
    • 2
    Email author
  • Ping Li
    • 2
  • Yueqiang Shen
    • 2
  • Yulu Lei
    • 2
  • Jian Guo
    • 2
  1. 1.Dipartimento di Scienze Biologiche, Geologiche e AmbientaliUniversità di BolognaBolognaItaly
  2. 2.Department of Geological EngineeringChang’an UniversityXi’anChina

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