التفاصيل البيبلوغرافية
| العنوان: |
Elasto-plastic-adhesive DEM model for simulating hillslope debris flows: cross comparison with field experiments. |
| المؤلفون: |
Albaba, Adel, Schwarz, Massimiliano, Wendeler, Corinna, Loup, Bernard, Dorren, Luuk |
| المصدر: |
Natural Hazards & Earth System Sciences Discussions; 2018, p1-30, 30p |
| مصطلحات موضوعية: |
GRANULAR flow, DIGITAL elevation models |
| مستخلص: |
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 50m3 of material were carried out on a channelized surface that is 41m long and 8m 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. [ABSTRACT FROM AUTHOR] |
|
Copyright of Natural Hazards & Earth System Sciences Discussions is the property of Copernicus Gesellschaft mbH and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Full Text Finder