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Submarine channels formation driven by turbidity currents interacting with an erodible bed
Rajesh K Mahato1, Subhasish Dey1, Sk Zeeshan Ali2
1Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India.
Proceedings. Mathematical, Physical, and Engineering Sciences
|July 15, 2022
Summary
This study investigates submarine channel formation from turbidity currents interacting with erodible beds. Key parameters influencing channel development were identified, revealing thresholds for stable submarine channel formation.
Area of Science:
- Geosciences
- Fluid Dynamics
- Sedimentology
Background:
- Turbidity currents are crucial in shaping submarine landscapes.
- Understanding submarine channel formation requires analyzing fluid-sediment interactions on erodible beds.
Purpose of the Study:
- To theoretically analyze submarine channel formation driven by turbidity currents.
- To investigate the influence of key flow and sediment transport parameters on channel development.
Main Methods:
- Utilized three-dimensional continuity and momentum equations for the fluid phase.
- Incorporated advection-diffusion and Exner equations for the solid phase.
- Linearized governing equations by imposing periodic perturbations on the base flow.
Main Results:
- Analyzed the response of base flow and perturbations to parameter variations.
- Determined the growth rate and critical wavenumber based on five key parameters.
- Identified upper thresholds for gravitational parameter, bed slope, sediment concentration, and erosion coefficient.
- Identified a lower threshold for the Rouse number.
Conclusions:
- Established critical parameter thresholds for submarine channel formation.
- Provided insights into the dynamics governing turbidity current channelization.
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