Modeling Sediment Transport in Energetic Wave Bottom Boundary Layers

LONG-TERM GOALS. The goals of this work are to develop better understanding of the sediment transport in wave bottom boundary layers (WBBL) in the nearshore and inner shelf and to develop predictive capabilities for these effects as a function of important environmental parameters, such as wave heig...

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Bibliographic Details
Main Author: Slinn, Donald N
Format: Report
Language:English
Subjects:
BEACHES
BOTTOM
BOUNDARY LAYER
DEPTH
EDDY CURRENTS
ENVIRONMENTS
FIELD CONDITIONS
FLOW
Fluid Mechanics
FLUIDS
FORMULATIONS
FREQUENCY
Hydrology, Limnology and Potamology
INSHORE AREAS
MATHEMATICAL MODELS
MEAN
MODULAR CONSTRUCTION
MOMENTUM
NUMERICAL ANALYSIS
OCEAN WAVES
PARAMETERS
PARTICULATES
PHASE
Physical and Dynamic Oceanography
REGIONS
SEDIMENT TRANSPORT
SEDIMENTS
SHEETS
SIMULATION
SPECTRA
THEORY
TRANSPORT
TURBULENCE
TWO PHASE FLOW
UNIDIRECTIONAL
WATER
WBBL(WAVE BOTTOM BOUNDARY LAYERS)
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Summary:LONG-TERM GOALS. The goals of this work are to develop better understanding of the sediment transport in wave bottom boundary layers (WBBL) in the nearshore and inner shelf and to develop predictive capabilities for these effects as a function of important environmental parameters, such as wave heights, sediment properties, beach slope, local water depth, wave frequency spectra, and the presence of mean currents. OBJECTIVES. The major tasks are to: (1) implement the coupling of the sediment transport module into the existing 3-D turbulent boundary layer model. (2) complete sets of direct numerical and large eddy simulations for two-phase flow (fluid-sediment suspensions) for sandy seabeds under uni-directional flow and energetic wave field conditions. (3) determine proportions of sediment transport that occur in bed-load and suspended load within the model framework for different near-bed shear stresses. (4) demonstrate quantitative model skill and range of application of parameterizations for two-phase coupling for different wave field conditions and sediment properties. (5) compare the 3-D model results with our existing 1-D WBBL sediment transport model to evaluate the necessary parameterizations for turbulent transport of sediment and momentum through the water column. APPROACH. We are extending current theory and numerical modeling capabilities for the wave bottom boundary layer to include the case of sediment transport over a sandy seabed for sheet flow conditions in the nearshore and inner shelf regions. The two-way coupling between the fluid and particulate phases is based on an Eulerian formulation.