Turbidity current flow over an erodible obstacle and phases of sediment wave generation

  title={Turbidity current flow over an erodible obstacle and phases of sediment wave generation},
  author={Moshe Strauss and Michael E. Glinsky},
  journal={Journal of Geophysical Research},
[1] We study the flow of particle-laden turbidity currents down a slope and over an obstacle. A high-resolution 2-D computer simulation model is used, based on the Navier-Stokes equations. It includes poly-disperse particle grain sizes in the current and substrate. Particular attention is paid to the erosion and deposition of the substrate particles, including application of an active layer model. Multiple flows are modeled from a lock release that can show the development of sediment waves (SW… 

Particle Size Distribution Controls the Threshold Between Net Sediment Erosion and Deposition in Suspended Load Dominated Flows

The central problem of describing most environmental and industrial flows is predicting when material is entrained into, or deposited from, suspension. The threshold between erosional and

Turbidity currents interacting with three-dimensional seafloor topography

Abstract Direct numerical simulations are employed to investigate the interactions of bidisperse turbidity currents with three-dimensional seafloor topography in the form of Gaussian bumps. Results

Influence of seafloor topography on the depositional behavior of bi-disperse turbidity currents: a three-dimensional, depth-resolved numerical investigation

We discuss the results of direct numerical simulations of bi-disperse turbidity currents interacting with a flat bottom wall and a Gaussian bump, respectively, with a focus on the final deposit

Mixing dynamics of turbidity currents interacting with complex seafloor topography

Direct Numerical Simulations are employed to investigate the mixing dynamics of turbidity currents interacting with seamounts of various heights. The mixing properties are found to be governed by the

Polydisperse suspensions: Erosion, deposition, and flow capacity

Deposition from particle‐laden flows is often described in terms of the capacity and competence of the flow, but robust definitions of these terms have proved elusive. In this paper we provide a

Is it appropriate to model turbidity currents with the three‐equation model?

The three‐equation model (TEM) was developed in the 1980s to model turbidity currents (TCs) and has been widely used ever since. However, its physical justification was questioned because

Modeling Gravity and Turbidity Currents: Computational Approaches and Challenges

This review article provides a detailed review of depth-resolving modeling strategies, including direct numerical simulations (DNS), large-eddy simulations (LES), and Reynolds-averaged Navier–Stokes (RANS) simulations.

Gravity and Turbidity Currents: Numerical Simulations and Theoretical Models

Part 1 of this article describes high-resolution Direct Numerical Simulations (DNS) of gravity and turbidity currents, with an emphasis on the structure, Lagrangian dynamics and energy budget of the



Channel formation by turbidity currents: Navier–Stokes-based linear stability analysis

The linear stability of an erodible sediment bed beneath a turbidity current is analysed, in order to identify potential mechanisms responsible for the formation of longitudinal gullies and channels.

Submarine channel and sediment wave formation by turbidity currents: Navier-Stokes based linear stability analysis

Submarine channel and sediment wave formation by turbidity currents: Navier-Stokes based linear stability analysis Brendon J. Hall Turbidity currents are a primary sediment transport mechanism on the

Experimental study on self‐accelerating turbidity currents

[1] A self-accelerating current is a particle-driven gravity flow moving on a sloping bottom whose velocity increases in the downstream direction as a result of increasing suspended sediment

Deep-water sediment wave formation: linear stability analysis of coupled flow/bed interaction

A linear stability analysis is carried out for the interaction of an erodible sediment bed with a sediment-laden, stratified flow above the bed, such as a turbidity or bottom current. The fluid

Self-accelerating turbidity currents

Approximate layer-averaged equations describing the mechanics of turbid underflows are derived. Closure of the equations describing the balance of fluid mass, sediment mass, and mean flow momentum

High-resolution numerical simulations of resuspending gravity currents: Conditions for self-sustainment

Received 21 February 2005; revised 30 June 2005; accepted 29 August 2005; published 22 December 2005. [1] We introduce a computational model for high-resolution simulations of particle-laden gravity

Turbidity Currents and Their Deposits

The article surveys the current state of our understanding of turbidity currents, with an emphasis on their fluid mechanics. It highlights the significant role these currents play within the global

Time‐ and Space‐Resolved Measurements of Deposition under Turbidity Currents

This chapter describes experiments measuring the instantaneous sediment deposition rates for a turbidity current. These measurements were obtained using a recently developed technique capable of very

Experiments on the entrainment of sediment into suspension by a dense bottom current

Experiments on the entrainment of bed sediment into suspension by density underflows are described. The density underflows were created by allowing saline water to move as a steady, continuous