Modeling landslide generated waves using the discontinuous finite element method

Pan, Wei1,2; Kramer, Stephan C.2; Piggott, Matthew D.2; Yu, Xiping3

2022-04-01

10.1002/fld.5090

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS   影响因子和分区

0271-2091

1097-0363

A new two-layer model for impulsive wave generation by deformable granular landslides is developed based upon a discontinuous Galerkin finite element discretization. Landslide motion is modeled using a depth-averaged formulation for a shallow subaerial debris flow, which considers the bed curvature represented by the local slope angle variable and accounts for inter-granular stresses using Coulomb friction. Wave generation and propagation are simulated with the three-dimensional non-hydrostatic coastal ocean model Thetis to accurately capture key features such as wave dispersion. Two different techniques are used in treating wetting and drying (WD) processes during the landslide displacement and wave generation, respectively. For the lower-layer landslide motion across the dry bed a classical thin-layer explicit WD method is implemented, while for the resulting free-surface waves interacted with the moving landslide an implicit WD scheme is utilized to naturally circumvent the artificial pressure gradient problem which may appear in the dynamic interaction between the landslide and water if using the thin-layer method. The two-layer model is validated using a suite of test cases, with the resulting good agreement demonstrating its capability in describing both the complex behaviors of granular landslides from initiation to deposition, and the consequent wave generation and propagation.

discontinuous Galerkin finite element method granular flow landslide generated wave non-hydrostatic two-layer model

SCI ; EI

英语

通讯

National Natural Science Foundation of China[41961144014] ; UK's Engineering and Physical Sciences Research Council (EPSRC)["EP/M011054/1","EP/L000407/1","EP/R029423/1"]

Computer Science ; Mathematics ; Mechanics ; Physics

Computer Science, Interdisciplinary Applications ; Mathematics, Interdisciplinary Applications ; Mechanics ; Physics, Fluids & Plasmas

WOS:000785896500001

WILEY

20221712034345

Finite element method ; Hydraulics ; Landslides ; Surface waves

Hydraulics:632.1 ; Numerical Methods:921.6

ENGINEERING

Web of Science

1.Tsinghua Univ, Dept Hydraul Engn, Beijing, Peoples R China
2.Imperial Coll London, Dept Earth Sci & Engn, London, England
3.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen, Peoples R China

Pan, Wei,Kramer, Stephan C.,Piggott, Matthew D.,et al. Modeling landslide generated waves using the discontinuous finite element method[J]. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS,2022,94:1298-1330.

Pan, Wei,Kramer, Stephan C.,Piggott, Matthew D.,&Yu, Xiping.(2022).Modeling landslide generated waves using the discontinuous finite element method.INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS,94,1298-1330.

Pan, Wei,et al."Modeling landslide generated waves using the discontinuous finite element method".INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS 94(2022):1298-1330.