3:00 PM - 3:15 PM
[SCG50-06] Develop new numerical method CGM to simulate landslides and enhance the description of turbidity suspension phenomena
Keywords:CGM, Concentration Gradient method, VOF, DBM, landslide
Homogenites, often underrepresented in geological studies, are layers of sediment that have been reworked and homogenized by intense seismic activity or other extreme events. While the novel depositional model for homogenites was proposed by another research group based on observed sedimentation patterns in seismically active enclosed basins, this study seeks to explore and validate this model through rheological perspectives. Our research aims to elucidate the dynamic processes governing these events, thereby providing a comprehensive narrative to the hypothesis. By applying the principles of fluid dynamics and non-Newtonian fluid modeling, we attempt to simulate and understand the reworking processes that lead to the characteristic fining-upward sequences in homogenites, enhancing the geological community's understanding of these significant sedimentary formations.
This study focuses on the simulation of submarine landslide-induced turbidity currents and their associated sediment suspension and deposition processes through the innovative integration of a Concentration Gradient Method (CGM) with the Discontinuous Bi-viscous Model (DBM). Utilizing the Volume of Fluid (VOF) method and the foundational Splash3D model, this approach innovates by amending the surface reconstruction limitations typically inherent in traditional VOF methodologies. Our novel implementation includes a two-step modification where the first step eliminates the surface reconstruction phase, and the second step incorporates a concentration gradient-based additional diffusion mechanism at the surface of the turbidity currents. This modification allows for a more accurate simulation of the initial dispersion and subsequent settlement of sediments following submarine landslides. This integration is crucial for accurately describing the complex dynamics of sediment interaction with water, particularly in the non-Newtonian fluid context of submarine environments. By simulating the sediment transport and suspension dynamics more accurately, the model aims to provide insights into the initial sediment dispersal mechanisms that are critical to understanding the formation of geological features such as homogenites.
The model results have been validated and compared with the experimental findings of Henrich. The validation demonstrates that the Concentration Gradient Method (CGM) significantly improves the precision of simulating turbidity diffusion compared to the traditional Volume of Fluid (VOF) approach. The results show a high degree of consistency with the experiments and indicate that adjustments to the diffusion parameters can lead to variations in suspension effects. A detailed discussion will be provided in the full text.
This study focuses on the simulation of submarine landslide-induced turbidity currents and their associated sediment suspension and deposition processes through the innovative integration of a Concentration Gradient Method (CGM) with the Discontinuous Bi-viscous Model (DBM). Utilizing the Volume of Fluid (VOF) method and the foundational Splash3D model, this approach innovates by amending the surface reconstruction limitations typically inherent in traditional VOF methodologies. Our novel implementation includes a two-step modification where the first step eliminates the surface reconstruction phase, and the second step incorporates a concentration gradient-based additional diffusion mechanism at the surface of the turbidity currents. This modification allows for a more accurate simulation of the initial dispersion and subsequent settlement of sediments following submarine landslides. This integration is crucial for accurately describing the complex dynamics of sediment interaction with water, particularly in the non-Newtonian fluid context of submarine environments. By simulating the sediment transport and suspension dynamics more accurately, the model aims to provide insights into the initial sediment dispersal mechanisms that are critical to understanding the formation of geological features such as homogenites.
The model results have been validated and compared with the experimental findings of Henrich. The validation demonstrates that the Concentration Gradient Method (CGM) significantly improves the precision of simulating turbidity diffusion compared to the traditional Volume of Fluid (VOF) approach. The results show a high degree of consistency with the experiments and indicate that adjustments to the diffusion parameters can lead to variations in suspension effects. A detailed discussion will be provided in the full text.