scholarly journals Development of a Numerical Model for Deposition and Flood Propagation by Multiple Inflows of Debris Flows and River Floods

2021 ◽  
Vol 14 (2) ◽  
pp. 20-30
Author(s):  
Takashi WADA ◽  
Kana NAKATANI ◽  
Yoshifumi SATOFUKA ◽  
Takahisa MIZUYAMA ◽  
Ken'ichirou KOSUGI ◽  
...  
Keyword(s):  
Numerical Model ◽  
Debris Flows ◽  
River Floods

scholarly journals Elasto-plastic-adhesive DEM model for simulating hillslope debris flows: cross comparison with field experiments

2018 ◽  
Author(s):  
Adel Albaba ◽  
Massimiliano Schwarz ◽  
Corinna Wendeler ◽  
Bernard Loup ◽  
Luuk Dorren
Keyword(s):  
Numerical Model ◽  
Flow Velocity ◽  
Debris Flows ◽  
Field Experiments ◽  
Initial Conditions ◽  
Experimental Tests ◽  
Height Velocity ◽  
Model Parameters ◽  
Fine Content ◽  
Adhesive Model

Abstract. This paper presents a Discrete Element-based elasto-plastic-adhesive model which is adapted and tested for producing hillslope debris flows. The numerical model produces three phases of particle contacts: elastic, plastic and adhesion. The model capabilities of simulating different types of cohesive granular flows were tested with different ranges of flow velocities and heights. The basic model parameters, being the basal friction (ϕb) and normal restitution coefficient (ϵn), were calibrated using field experiments of hillslope debris flows impacting two sensors. Simulations of 50 m3 of material were carried out on a channelized surface that is 41 m long and 8 m wide. The calibration process was based on measurements of flow height, flow velocity and the pressure applied to a sensor. Results of the numerical model matched well those of the field data in terms of pressure and flow velocity while less agreement was observed for flow height. Those discrepancies in results were due in part to the deposition of material in the field test which are not reproducible in the model. A parametric study was conducted to further investigate that effect of model parameters and inclination angle on flow height, velocity and pressure. Results of best-fit model parameters against selected experimental tests suggested that a link might exist between the model parameters ϕb and ϵn and the initial conditions of the tested granular material (bulk density and water and fine contents). The good performance of the model against the full-scale field experiments encourages further investigation by conducting lab-scale experiments with detailed variation of water and fine content to better understand their link to the model's parameters.

Coupled Numerical Model CFD-DEM of Debris Flows Impact to Improve the Vulnerability Quantification of Structures

2021 ◽  
Author(s):  
Rime Chehade ◽  
Bastien Chevalier ◽  
Fabian Dedecker ◽  
Pierre Breul
Keyword(s):  
Numerical Model ◽  
Debris Flows ◽  
Coupled Numerical Model

scholarly journals Numerical modeling using an elastoplastic-adhesive discrete element code for simulating hillslope debris flows and calibration against field experiments

2019 ◽  
Vol 19 (11) ◽  
pp. 2339-2358
Author(s):  
Adel Albaba ◽  
Massimiliano Schwarz ◽  
Corinna Wendeler ◽  
Bernard Loup ◽  
Luuk Dorren
Keyword(s):  
Numerical Model ◽  
Flow Velocity ◽  
Debris Flows ◽  
Field Experiments ◽  
Initial Conditions ◽  
Experimental Tests ◽  
Discrete Element ◽  
Height Velocity ◽  
Model Parameters ◽  
Fine Content

Abstract. This paper presents a discrete-element-based elastoplastic-adhesive model which is adapted and tested for producing hillslope debris flows. The numerical model produces three phases of particle contacts: elastic, plastic and adhesive. A parametric study was conducted investigating the effect of model parameters and inclination angle on flow height, velocity and pressure, in order to define the most sensitive parameters to calibrate. The model capabilities of simulating different types of cohesive granular flows were tested with different ranges of flow velocities and heights. The basic model parameters, the microscopic basal friction (ϕb) and ratio between stiffness parameters k1/k2, were calibrated using field experiments of hillslope debris flows impacting a pressure-measuring sensor. Simulations of 50 m3 of material were carried out on a channelized surface that is 41 m long and 8 m wide. The calibration process was based on measurements of flow height, flow velocity and the pressure applied to a sensor. Results of the numerical model matched those of the field data in terms of pressure and flow velocity well while less agreement was observed for flow height. Those discrepancies in results were due in part to the deposition of material in the field test, which is not reproducible in the model. Results of best-fit model parameters against selected experimental tests suggested that a link might exist between the model parameters ϕb and k1/k2 and the initial conditions of the tested granular material (bulk density and water and fine contents). The good performance of the model against the full-scale field experiments encourages further investigation by conducting lab-scale experiments with detailed variation in water and fine content to better understand their link to the model's parameters.

Using Numerical Model to Analyze Reduction of Debris Flows by the Installation Location of Check Dams

2017 ◽  
Vol 13 (4) ◽  
pp. 117-128
Author(s):  
Won Jun Tak ◽  
◽  
Kye Won Jun ◽  
Byung Sik Kim ◽  
Yong Ho Yoon ◽  
...  
Keyword(s):  
Numerical Model ◽  
Debris Flows ◽  
Check Dams

Two-dimensional numerical model for debris flows in the Jiangjia Gully, Yunnan Province

2011 ◽  
Vol 8 (6) ◽  
pp. 757-766 ◽  
Author(s):  
Hong Peng ◽  
Yanxin Zhao ◽  
Peng Cui ◽  
Wanshun Zhang ◽  
Xuejiao Chen ◽  
...  
Keyword(s):  
Numerical Model ◽  
Debris Flows ◽  
Yunnan Province ◽  
Two Dimensional ◽  
Jiangjia Gully

1D Numerical Model of Muddy Subaqueous and Subaerial Debris Flows

2001 ◽  
Vol 127 (11) ◽  
pp. 959-968 ◽  
Author(s):  
Jasim Imran ◽  
Gary Parker ◽  
Jacques Locat ◽  
Homa Lee
Keyword(s):  
Numerical Model ◽  
Debris Flows
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