Abstract
Recent scientific research indicates that the Rockall Bank Slide Complex in the NE Atlantic Ocean has formed as the result of repetitive slope failures that can be distinguished in at least three major phases. These sliding episodes took place during and before the Last Glacial Maximum. This work attempts the modelling of each sliding episode with the incorporation of the landslide’s rheological properties. The objective is to study the landslide kinematics and final deposition of each episode under a rheological framework that comes in agreement with the field observations. To do so in the present work, we use different types of rheological models to compute the total retarding stress and simulate submarine failure. The Bingham rheology and the frictional rheology are used to model the flow behavior. The scope of this approach is to understand the effect of the two classical laws in landslide kinematics. A rheological model that combines the two regimes is also used. To account for the hydrodynamic drag,...
Highlights
The sediment concentration and water content of the landslide play an important role on the rheological behavior
Depending on the selection of the input parameters for the calculation of the shear retarding stress, the flow properties may vary corresponding to different fluid types
Three main types of rheological models have been used in the past to describe the dynamics of submarine landslides at the post-failure stage:[1,4] (1) viscous models, (2) frictional models, and (3) viscoplastic models
Summary
The post-failure stage of submarine landslides can be adequately described using the fluid mechanics principles and is often considered as the most significant for tsunami generation.[1,2] Above all, the sediment concentration and water content of the landslide play an important role on the rheological behavior. Mixing of the slide material with water increases its pore water pressure and can have a significant reduction in the shear strength of the flow.[5] Measurements of the yield strength on the sediments of the slope and on the deposits can differ substantially.[23] Mechanisms such as hydroplaning and remoulding that enhance the capability of the flow to travel large distances are often not accounted in the modelling. The results of our simulations show that the Bingham rheology represents successfully the landslide deposition for this case, whereas the basal friction critically affects the run-out length of the flow and has to be significantly small. The landslide modelling of the events draws information from the latest episode of collapse to study the landslide deposition
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