A Numerical Study Of The Scale Effects
Affecting The Evolution And Sediment
Entrainment Capacity Of A Gravity Current,
Propagating Over A Loose Bed Containing
Large-scale Roughness Elements
Author(s)
T. Tokyay & G. Constantinescu
Abstract
When compositional gravity currents propagate over a loose bed, they can
entrain, carry, and deposit large quantities of sediment over considerable
distances from the entrainment location. The capacity of compositional gravity
currents to entrain sediment of various sizes from a loose bed containing largescale
roughness elements in the form of two-dimensional (2D) ribs is
investigated using high-resolution Large Eddy Simulation (LES). The
compositional gravity current is produced by the instantaneous release of a large
volume of heavier lock fluid in a straight open channel. The present study
focuses on the influence of the Reynolds number and the presence of 2D ribs on
the evolution of the lock-exchange gravity current and on the distributions of the
bed friction velocity. At the higher Reynolds number considered in the present
investigation, the structure of the gravity current is closer to the inviscid state
often assumed in simplified models.
Keywords: gravity currents, sediment entrainment, Large Eddy Simulation,
large-scale roughness.
Keywords
gravity currents, sediment entrainment, Large Eddy Simulation,
large-scale roughness
Related Book
Other papers in this volume
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