Large-eddy simulation of flash flood propagation and sediment transport in a dry-bed desert stream

2020 ◽  
Vol 35 (6) ◽  
pp. 576-586
Author(s):  
Ali Khosronejad ◽  
Kevin Flora ◽  
Zexia Zhang ◽  
Seokkoo Kang
Keyword(s):  
Sediment Transport ◽  
Large Eddy Simulation ◽  
Flash Flood ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Desert Stream

scholarly journals Large eddy simulation of sediment transport over rippled beds

2014 ◽  
Vol 1 (1) ◽  
pp. 755-801
Author(s):  
J. C. Harris ◽  
S. T. Grilli
Keyword(s):  
Sediment Transport ◽  
Large Eddy Simulation ◽  
Flow Model ◽  
Near Field ◽  
Ocean Engineering ◽  
Mean Flow ◽  
Eddy Simulation ◽  
Turbulent Statistics ◽  
Large Eddy ◽  
Wave Induced

Abstract. Wave-induced Boundary Layer (BL) flows over sandy rippled bottoms are studied using a numerical model that applies a one-way coupling of a "far-field" inviscid flow model to a "near-field" Large Eddy Simulation (LES) Navier–Stokes (NS) model. The incident inviscid velocity and pressure fields force the LES, in which near-field, wave-induced, turbulent bottom BL flows are simulated. A sediment suspension and transport model is embedded within the coupled flow model. The numerical implementation of the various models has been reported elsewhere, where we showed that the LES was able to accurately simulate both mean flow and turbulent statistics for oscillatory BL flows over a flat, rough bed. Here, we show that the model accurately predicts the mean velocity fields and suspended sediment concentration for oscillatory flows over full-scale vortex ripples. Tests show that surface roughness has a significant effect on the results. Beyond increasing our insight into wave-induced oscillatory bottom BL physics, models of sediment transport as sophisticated as the present coupled model have the potential to make quantitative predictions of sediment transport and erosion/accretion around partly buried objects in the bottom, which is important for a vast array of bottom deployed instrumentation and other practical ocean engineering problems.

scholarly journals Large eddy simulation of sediment transport over rippled beds

2014 ◽  
Vol 21 (6) ◽  
pp. 1169-1184 ◽  
Author(s):  
J. C. Harris ◽  
S. T. Grilli
Keyword(s):  
Sediment Transport ◽  
Large Eddy Simulation ◽  
Flow Model ◽  
Near Field ◽  
Ocean Engineering ◽  
Mean Flow ◽  
Coupled Models ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Wave Induced

Abstract. Wave-induced boundary layer (BL) flows over sandy rippled bottoms are studied using a numerical model that applies a one-way coupling of a "far-field" inviscid flow model to a "near-field" large eddy simulation (LES) Navier–Stokes (NS) model. The incident inviscid velocity and pressure fields force the LES, in which near-field, wave-induced, turbulent bottom BL flows are simulated. A sediment suspension and transport model is embedded within the coupled flow model. The numerical implementation of the various models has been reported elsewhere, where we showed that the LES was able to accurately simulate both mean flow and turbulent statistics for oscillatory BL flows over a flat, rough bed. Here we show that the model accurately predicts the mean velocity fields and suspended sediment concentration for oscillatory flows over full-scale vortex ripples. Tests show that surface roughness has a significant effect on the results. Beyond increasing our insight into wave-induced oscillatory bottom BL physics, sophisticated coupled models of sediment transport such as that presented have the potential to make quantitative predictions of sediment transport and erosion/accretion around partly buried objects in the bottom, which is important for a vast array of bottom deployed instrumentation and other practical ocean engineering problems.

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