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Simulating Dredging and Sediment Feedbacks with HEC-RAS. Stanford Gibson, PhD Hydrologic Engineering Center USACE. Road Map. Importance of Sediment Feedbacks on Dredged Channels Overview of HEC-RAS Two Examples of Navigation Dredging Simulations New Dredging Capabilities in HEC-RAS 4.2.

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Simulating Dredging and Sediment Feedbacks with HEC-RAS


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simulating dredging and sediment feedbacks with hec ras

Simulating Dredging and Sediment Feedbacks with HEC-RAS

Stanford Gibson, PhD

Hydrologic Engineering Center

USACE

slide2

Road Map

  • Importance of Sediment Feedbacks on Dredged Channels
  • Overview of HEC-RAS
  • Two Examples of Navigation Dredging Simulations
  • New Dredging Capabilities in HEC-RAS 4.2
slide3

Importance of Modeling Feedbacks on Sediment Systems

Sediment

Deposition

Channel

Geometry

Change

Dredging

slide5

~

~

slide7

HEC-RAS

Sediment Transport

  • Mobile Boundary Hydraulic Model
    • Captures Sediment-Hydraulic Feedbacks
  • Cohesive and Cohesionless Transport
  • Public Domain - 1D Model – Widely Applied
    • There is probably already an HEC-RAS hydraulic model of your system
  • Good at Depositional Sediment Modeling
  • Dredging Capabilities
slide8

Ontonagon River

Cuyahoga River

slide9

Ontonagon River

Model and Calibration by Calvin Creech of LRD

slide11

Classic Dredging

Capabilities

  • HEC-RAS 4.1 followed HEC 6
  • Allow user definition of time and extent of dredging configuration.
    • left/right extent and elevation for each XS
  • Only rectangular dredging cuts.
  • Instantaneous Dredging
slide14

New Dredge Options

in Version 4.2

slide17

Missouri River

Through Kansas City

slide20

Modeling Residual

Sediment Suspension

slide21

Modeling Residual

Sediment Suspension

slide23

Bed Layers

z

z

Gradations can then be “layered”

Dx

Dx

Dx

Dx

Dx

Dx

Resistant Reservoir Layer

Lacustrian Glacial Strata

Glacial Outwash Strata

Erodibility=f(Density)

Density=f(Depth)

slide24

Stanford Gibson: stanford.gibson@usace.army.mil

HEC-RAS: www.hec.usace.army.mil

Collaborators:

The RAS Team: Gary Brunner, Mark Jensen,

Steve Piper, Cameron Ackerman

District Partners: John Shelley NWK, Calvin Creech LRD