Gravity-flow processes: behavior, transport, initiation, deposition and geological record (Sponsored by IAS)
|Convener: T. Mulder | Co-Conveners: Maxime Farin , Anne Mangeney|
This session is a merging of initial sessions SSP3.1.1 et SSP3.1.4
The session aims are:
1) To explore the processes of erosion, transport, segregation, sedimentation and deposition within flowing granular media such as debris flows, snow and debris avalanches, pyroclastic flows and landslides, lahars. The dynamics of particulate flows are strongly affected by the addition or loss of mass through erosion and deposition of granular material. During transport, sorting of grain sizes, shapes and densities by particle segregation modifies the flow behaviour and results in patterns observed in many geophysical flows. These processes are highly dependent on flow parameters (viscosity, density, pore fluid pressure or temperature) and may lead to a rich variety of complex depositional structures in granular geophysical flows.
2) To have a state of the art on relationship between processes leading to transport, erosion and deposition by various downslope mass-flow processes and the related deposits. This includes processes related to single flow but also deposit stacking leading to the building of various-scale turbidite complexes including turbidity currents stricto sensu but also include all the types of flow processes including concentrated flows. New results of large-scale mass Transport Complexes are expected. In addition this session includes recent finding on flow initiation, in particular relationship between flow triggering and expulsion of deep fluid.
3) At the geological scale, the results on the stratigraphic position of gravity-flow processes and forcing parameters on flow initiation at a geologic scale both in siliciclastic system and carbonate-slope systems.
The session includes contributions from experimental, numerical and field investigations examining erosion, transport, segregation, sedimentation and deposition processes within particulate geophysical flows and their resulting deposits. Analogous laboratory experiments and numerical modelling are also expected as well as result based on field work or submarine data collection.