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Simulating Dredging 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 with hec ras

Simulating Dredgingwith 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

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
slide9

Ontonagon River

Cuyahoga River

slide10

Ontonagon River

Model and Calibration by Calvin Creech of LRD

dredging option
Dredging Option
  • From Options, click on Dredging
slide15

New Dredge Options

in Version 4.2

slide16

New Dredge Options

in Version 4.2

slide17

New Dredge Options

in Version 4.2

slide19

New Dredge Options

in Version 4.2

slide20

New Dredge Options

in Version 4.2

slide21

New Dredge Options

in Version 4.2

slide22

Eulerian Multi-Layer

Bed Accounting

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)