Numerical modelling of the long runout character of 2015 Shenzhen landslide with a general two-phase mass flow model

Qiao, Chengpeng; Ou, Guoqiang; Pan, Huali

doi:10.1007/s10064-018-1329-z

Cited by 17 publications

(18 citation statements)

References 33 publications

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“…This solves the long-standing dilemma of mass mobility, and shows that erosion can enhance the mass flow mobility. The importance of the Pudasaini and Fischer 27 mechanical erosion model for two-phase mass flows consisting of viscous fluid and solid particles are increasingly realized in recent simulations of mixture mass flows considering the real catastrophic events 6,48,[55][56][57][58][59][60] . These modeling approaches have clearly indicated how the mechanical erosion model could appropriately simulate the actual flow dynamics, surge development, run-out or mobility, and deposition morphology based on the mechanical erosion rates and the erosion-induced momentum productions.…”

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confidence: 99%

The mechanics of landslide mobility with erosion

2021

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Erosion can significantly increase the destructive power of a landslide by amplifying its volume, mobility and impact force. The threat posed by an erosive landslide is linked to its mobility. No mechanical condition has yet been presented for when, how and how much energy erosive landslides gain or lose. Here, we pioneer a mechanical model for the energy budget of erosive landslides that controls enhanced or reduced mobility. Inertia is related to an entrainment velocity, is a fundamentally new understanding. This ascertains the true inertia of erosive landslides, making a breakthrough in correctly determining the landslide mobility. Erosion velocity, which regulates the energy budget, determines the enhanced or reduced mobility. Newly developed energy generator offers the first-ever mechanical quantification of erosional energy and a precise description of mobility. This addresses the long-standing question of why many erosive landslides generate higher mobility, while others reduce mobility. We demonstrate that erosion and entrainment are different processes. Landslides gain energy and enhance mobility if the erosion velocity exceeds the entrainment velocity. Energy velocity delineates distinct excess energy regimes. Newly introduced mobility scaling and erosion number deliver the explicit measure of mobility. Presented dynamical equations correctly include erosion induced net momentum production.

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confidence: 99%

The mechanics of landslide mobility with erosion

2021

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“…Therefore, laboratory or field experiments (Iverson et al, 2011; de Haas and van Woerkom, 2016;Lu et al, 2016;Lanzoni et al, 2017;Li et al, 2017;Pilvar et al, 2019;Baselt et al, 2021) and theoretical modeling (Le and Pitman, 2009;Pudasaini, 2012;Pudasaini and Mergili, 2019) remain the major source of knowledge in landslide and debris flow dynamics. Recently, there has been a rapid increase in comprehensive numerical modeling for mass transports (McDougall and Hungr, 2005;Medina et al, 2008;Cascini et al, 2014;Frank et al, 2015;Iverson and Ouyang, 2015;Cuomo et al, 2016;Mergili et al, 2020a, b;Qiao et al, 2019;Liu et al, 2021). However, to a certain degree, numerical simulations are approximations of the physical-mathematical model equations.…”

Section: Introductionmentioning

confidence: 99%

The landslide velocity

Pudasaini

Krautblatter

2022

Earth Surf. Dynam.

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Abstract. Proper knowledge of velocity is required in accurately determining the enormous destructive energy carried by a landslide. We present the first, simple and physics-based general analytical landslide velocity model that simultaneously incorporates the internal deformation (nonlinear advection) and externally applied forces, consisting of the net driving force and the viscous resistant. From the physical point of view, the model represents a novel class of nonlinear advective–dissipative system, where classical Voellmy and inviscid Burgers' equations are of this general model. We show that the nonlinear advection and external forcing fundamentally regulate the state of motion and deformation, which substantially enhances our understanding of the velocity of a coherently deforming landslide. Since analytical solutions provide the fastest, most cost-effective, and best rigorous answer to the problem, we construct several new and general exact analytical solutions. These solutions cover the wider spectrum of landslide velocity and directly reduce to the mass point motion. New solutions bridge the existing gap between negligibly deforming and geometrically massively deforming landslides through their internal deformations. This provides a novel, rapid, and consistent method for efficient coupling of different types of mass transports. The mechanism of landslide advection, stretching, and approaching the steady state has been explained. We reveal the fact that shifting, uplifting, and stretching of the velocity field stem from the forcing and nonlinear advection. The intrinsic mechanism of our solution describes the fascinating breaking wave and emergence of landslide folding. This happens collectively as the solution system simultaneously introduces downslope propagation of the domain, velocity uplift, and nonlinear advection. We disclose the fact that the domain translation and stretching solely depend on the net driving force, and along with advection, the viscous drag fully controls the shock wave generation, wave breaking, folding, and also the velocity magnitude. This demonstrates that landslide dynamics are architectured by advection and reigned by the system forcing. The analytically obtained velocities are close to observed values in natural events. These solutions constitute a new foundation of landslide velocity in solving technical problems. This provides practitioners with key information for instantly and accurately estimating the impact force that is very important in delineating hazard zones and for the mitigation of landslide hazards.

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“…focused on the symmetric issues in the flow in different rotational symmetries and the obstacle shapes employing the general two-phase mass flow model (Pudasaini 2012) and the open source computational tool r.avaflow. Qiao et al (2018) also used the same model to simulate and analyze the run out characteristics of the catastrophic landslide that occurred in 2015 at Hongao construction waste dumpsite in the Guangming New District of Shenzhen, China. The two-phase mass flow model (Pudasaini 2012) is also employed to construct a generalized quasi two-phase bulk mixture model Pokhrel et al (2018), and an extended quasi-two phase mixture model (Khattri and Pudasaini 2018) capturing more physics of two-phase mass flows.…”

Section: Introductionmentioning

confidence: 99%

“…In most of the existing works, numerical experiments were carried on by taking constant upstream slope (Pudasaini 2012;Kafle 2014;Pudasaini 2014;Kafle et al 2016;Kattel et al 2016;Kafle and Tuladhar 2018;Kattel et al 2018;Qiao et al 2018;Kafle 2019;). This may not be the case in many real field scenarios.…”

Section: Introductionmentioning

confidence: 99%

Numerical Experiments on Effect of Topographical Slope Changes in the Dynamics of Landslide Generated Water Waves and Submarine Mass Flows

2021

JAFM

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Numerical modelling of the long runout character of 2015 Shenzhen landslide with a general two-phase mass flow model

Cited by 17 publications

References 33 publications

The mechanics of landslide mobility with erosion

The mechanics of landslide mobility with erosion

The landslide velocity

Numerical Experiments on Effect of Topographical Slope Changes in the Dynamics of Landslide Generated Water Waves and Submarine Mass Flows

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