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EXTREME TRANSPORT OF SEDIMENT DUE TO TURBIDITY CURRENTS IN COASTAL WATERS

Leo C. van Rijn

Open publisher page 3 citations

Abstract

Turbidity currents of fine sand are analyzed and modelled using a depth-averaged approach for two layers (lower and upper layer). The basic equations and closure relationships for a turbidity current of fine sand are formulated and solved by means of a spreadsheet programme (Excel application). It is most easy to formulate the equations with respect to a tilting coordinate system assuming (1) that the flow is steady, (2) that the velocities (u1) and sediment concentrations (c1) in the upper layer 1 are negligibly small (density is equal to the fluid density), (3) that the flow in the lower layer 2 is fully turbulent and (4) that the pressure is hydrostatic. The present work was inspired by an extreme turbidity current event detected in the Zaire submarine canyon (Africa) at 4000 m water depth. This dataset was used to verify the numerical model.

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What this paper is about

Turbidity currents of fine sand are analyzed and modelled using a depth-averaged approach for two layers (lower and upper layer). The basic equations and closure relationships for a turbidity current of fine sand are formulated and solved by means of a spreadsheet programme (Excel application). It is most easy to formulate the equations with respect to a tilting coordinate system assuming (1) that the flow is steady, (2) that the velocities (u1) and sediment concentrations (c1) in the upper layer 1 are negligibly small (density is equal to the fluid density), (3) that the flow in the lower layer 2 is fully turbulent and (4) that the pressure is hydrostatic. The present work was inspired by an extreme turbidity current event detected in the Zaire submarine canyon (Africa) at 4000 m water depth. This dataset was used to verify the numerical model.

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Available abstract

Turbidity currents of fine sand are analyzed and modelled using a depth-averaged approach for two layers (lower and upper layer). The basic equations and closure relationships for a turbidity current of fine sand are formulated and solved by means of a spreadsheet programme (Excel application). It is most easy to formulate the equations with respect to a tilting coordinate system assuming (1) that the flow is steady, (2) that the velocities (u1) and sediment concentrations (c1) in the upper layer 1 are negligibly small (density is equal to the fluid density), (3) that the flow in the lower layer 2 is fully turbulent and (4) that the pressure is hydrostatic. The present work was inspired by an extreme turbidity current event detected in the Zaire submarine canyon (Africa) at 4000 m water depth. This dataset was used to verify the numerical model.

Key concepts: Turbidity current, Turbidity, Dredging, Geology, Sediment, Current (fluid), Sediment transport, Turbulence

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EXTREME TRANSPORT OF SEDIMENT DUE TO TURBIDITY CURRENTS IN COASTAL WATERS — Research Paper | ScholarLens