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US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Sediment Model of Rivers
Charlie Berger601-634-2570
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
CHL and HQ constraints“consolidate capabilities”
• TABS, HIVEL2D � Unstructured Mesh• HIVEL2D � Super- and sub-critical flow• HIVEL2D � Tow and ship effects• CH3D � Multi-grain size sands• TABS, CH3D-co-sed � Clays (cohesive)
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Approach
• Create library of routines for sediment that are reusable inmost hydrodynamic codes – Sediment Library
• Create modular hydrodynamic type code that includes manyphysical environments – Multiphysics
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Sediment Library Development andapplication in ADH
• Multiple grain size• Cohesive and Noncohesive• Suspended and Bed Load
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
ADH Features
• Multi-Physics• Adaptive Mesh• Single to Multiprocessor - Portable
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
ADH Philosophy
Shallow WaterEquations
Computational Engine(FE utilities, preconditioners,
solvers, I/O to xMS GUIs)
UnsaturatedGroundwater
EquationsNavier-StokesEquations
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Adaption
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Why should we care aboutadaption?
• Hydrodynamic models, with sufficient resolution, convergeto the equations of motion. With coarse resolution they willconverge to a different problem.
• Modelers have a feel for the resolution needed to capturethe geometry, but not necessarily the hydro, sediment, . . .
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
How important is grid resolution?Coarse Mesh
182 nodes/300 elements
Refined Mesh #39849 nodes/19200 elements
Refined Mesh #1663 nodes/1200 elements
Refined Mesh #22525 nodes/4800 elements
Initial Concentration Cloud
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Grid Resolution Results…
Coarse
Refined #2
Refined #1
Refined #3
at timestep = 380 seconds
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Adaptive Mesh with ConcentrationPlume
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Benefit to users
• Create a mesh to capture the depths and geometry, letmodel refine mesh to capture hydraulic and sedimentgradients.
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Original MeshCaptures Bathymetry
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Adapted MeshCaptures Hydrodynamics
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Adaption in 3DExample
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Mesh Adaption in the Subsurface
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Adaption in 2DExamples
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Supercritical Transition; WaterDepth
Early
Intermediate
Final
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Supercritical Contraction
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Adaption 1
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Adaption 2
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Adaption 3
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Flooding Example – 2D
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
WhiteRiver
ArkansasRiver
Mississ
ippi R
iver
Rosedale,MS
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
White River
White River
Arkansas River
Arkansas River
Arkansas and White Rivers ExampleArkansas and White Rivers Example
InundationInundation –– water depthswater depthsFlow over leveeFlow over levee -- VelocityVelocity
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Bed Algorithm
Active Layer
1
234
1
23
4
Start End of TimeStep
Erosion witharmoring
Combinemost similar
strata
Transition
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Kate Aubrey - Currents
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
1975 Kate Aubrey – Miss. River
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Sediment BedVery Fine Sand Deposits
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
1999 Kate Aubrey – Miss. River
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
2D Module Features
• Bendway Correction• Integration from 3D• Coupled bed/flow calculations• Wetting/drying
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Development Path
• Long term simulation• Water Quality Library connection• 2D/3D meshes
US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC
Conclusions
• Modular DesignMultiphysicsLibrary – Sediment
• Adaption• Bed Load, Suspended Load, Bendway Correction (flow and
sediment)
