Numerical Study on Debris Flow
Abstract
Debris flows due to tailings dam failure and heavy rainfall on a steep mountain have been considered serious disasters. Many mine dam-break, mudslide events have been reported in the literature, but unfortunately, the detailed researches were not complete. In this study, we want to develop a brand new model to simulate the flowslides, mudflows and debris flows. Bingham model was widely used to depict mud material. However, due to the intrinsic characteristic, the Bingham model is not able to offer a satisfactory illustration of the stratified material. We extended the Bingham model by introducing the discontinuous rheology relationship between the solid and liquid phases. A newly non-Newtonian Discontinuous Bi-viscous Model (DBM) was invented with a purpose reproducing closet mud material nature without empirical coefficient as well as empirical formula. A yield strain rate was introduced as the indicator to identify the corresponding rheological prosperity. This new rheology model was integrated and coupled into the Splash3D model, which is resolving the full Navier-Stokes equations with using PLIC VOF as a surface tracking algorithm. The DBM was carefully validated with the theoretical result and laboratory data with good agreements. The Gypsum Tailings dam in East Texas in 1966 was taken as an application case. Results reveal a comparison between two model: Bingham model and DBM including released material length, shape, and average velocity.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMNH33D0947V
- Keywords:
-
- 1810 Debris flow and landslides;
- HYDROLOGY;
- 1826 Geomorphology: hillslope;
- HYDROLOGY;
- 4306 Multihazards;
- NATURAL HAZARDS;
- 7212 Earthquake ground motions and engineering seismology;
- SEISMOLOGY