Influence of pre-existing bed on diluted turbidity current propagation
S.A. Wahab (TU Delft - Offshore and Dredging Engineering)
C. Chassagne (TU Delft - Environmental Fluid Mechanics)
R.L.J. Helmons (TU Delft - Offshore and Dredging Engineering)
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Abstract
Turbidity currents are a subclass of gravity currents where a particle-laden fluid flows through a relatively lighter fluid under the effect of gravity. The particles in this case are mostly suspended by the turbulence created due to the forward motion of the current along the boundary of the domain [1]. Turbidity currents are an inevitable part of any dredging or deep-sea mining activity. They have a potential impact on the local ecosystem [2]. They have the tendency to propagate further from the area of operation before settling down.
This study examines the behavior of turbidity currents which are quite dilute in nature, as they flow over different bed types both pre-existing and freshly deposited ones. The pre-existing bed here refers to the ocean, river or channel bed while the freshly deposited bed consists of a layer of materials deposited from previous run, which has loose materials on its surface.