Sediment Model of Rivers · 2017-08-02 · US Army Corps of Engineers Coastal and Hydraulics...

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US Army Corpsof Engineers Coastal and Hydraulics Laboratory - ERDC

Sediment Model of Rivers

Charlie Berger601-634-2570

Charlie.R.Berger@erdc.usace.army.mil

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)