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Journal of Mountain Science

, Volume 16, Issue 2, pp 364–382 | Cite as

Numerical simulation of mud-flows impacting structures

  • Massimo Greco
  • Cristiana Di CristoEmail author
  • Michele Iervolino
  • Andrea Vacca
Article

Abstract

The study of the interaction of mud-flows with obstacles is important to define inundation zones in urban areas and to design the possible structural countermeasures. The paper numerically investigates the impact of a mud-flow on rigid obstacles to evaluate the force acting on them using two different depth-integrated theoretical models, Single-Phase Model (SPM) and Two-Phase Model (TPM), to compare their performance and limits. In the first one the water-sediment mixture is represented as a homogeneous continuum described by a shear-thinning power-law rheology. Alternatively, the two-phase model proposed by Di Cristo et al in 2016 is used, which separately accounts for the liquid and solid phases. The considered test cases are represented by a 1D landslide flowing on a steep slope impacting on a rigid wall and a 2D mud dam-break flowing on a horizontal bottom in presence of single and multiple rigid obstacles. In the 1D test case, characterized by a very steep slope, the Two-Phase Model predicts the separation between the two phases with a significant longitudinal variation of the solid concentration. In this case the results indicate appreciable differences between the two models in the estimation of both the wave celerity and the magnitude of the impact, with an overestimation of the peak force when using the Single-Phase Model. In the 2D test-cases, where the liquid and solid phases remain mixed, even if the flow fields predicted by the two models present some differences, the essential features of the interaction with the obstacles, along with the maximum impact force, are comparable.

Keywords

Mud-Flow Impact force Two-phase model Power-law 

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Notes

Acknowledgements

The work described in the present paper was realized in the framework of the project MISALVA, financed by the Italian Minister of the Environment, Land Protection and Sea. CUP H36C18000970005.

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.DICEAUniversità di Napoli Federico IINapoliItaly
  2. 2.DIUniversità della Campania Luigi VanvitelliAversa (CE)Italy

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