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New Features for HEC-RAS 5.0.4+
Martin Teal, P.E., P.H., D.WRE
September 4, 2018
Thanks to HEC Staff:• Stanford Gibson, Ph.D.• Alex Sánchez, Ph.D.
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2017 Topics – 5.0 to 5.0.3+
1. Unsteady Sediment Transport
2. USDA-ARS Bank Stability and ToeErosion Model (BSTEM)
3. Other New Sediment Features
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2018 Topics – 5.0.3 to 5.0.5+
1. Transport Function Calibration / Modification
2. Variable Sediment Properties3. 2D Connection4. Internal Stage BC (Quasi-
Unsteady)5. Sediment Rules
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2018 Topics – 5.1+
1. 2D Sediment Transport
3. Stochastic Sediment (WAT)4. New Viewer
2. Non-Newtonian Flow
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REMINDER - Develop and Calibrate a Good Hydraulic Model First
-Variable n-values-Ineffective Flow Areas
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HEC-RAS Sediment Data InputStarts here:
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2018 Topics – 5.0.3 to 5.0.5+
1. Transport Function Calibration / Modification
2. Variable Sediment Properties3. 2D Connection4. Internal Stage BC (Quasi-
Unsteady)5. Sediment Rules
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Transport Function Calibration / Modification1. “Exposes”
transport parameters
2. Two ratios added for calibration
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Variable Sediment Properties1. Editor expanded to include other
properties
2. Allows gaps and overlaps in grain size properties (check box)
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2D Sediment Connection
1. Passes sediment from unsteady 1D model to a 2D area using a lateral structure
2. Since no 2D sediment (yet), simply becomes a sink
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Internal Stage Boundary Condition1. Quasi-unsteady enhancement
2. ISBC – time series of fixed stages at any X-Sec
a. Overrides TS Gate Openings
b. Useful in dam removal / flushing
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Sediment Rules1. RAS can operate structures based on
bed change at a cross section or sediment concentration (e.g., downstream TMDLs).
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2018 Topics – 5.1+
1. 2D Sediment Transport
3. Stochastic Sediment (WAT)4. New Viewer
2. Non-Newtonian Flow
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2D Sediment TransportCo-development for RAS & HMSFinite Volume:
Mass conservativeUnstructured polygonal mesh:
Maximum flexibilityImplicit:
Robust for large time stepsDetailed subgrid bathymetry
Partial wetting and drying Allows for much larger cells while maintaining
accuracy
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Subgrid Modeling
Rain
Channel
Percolation
Computational Cell
Wet Dry
• Representation of the physical terrain and processes at a subgrid scale
• Allows for larger grid cells reducing computational cells, and computational times
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Subgrid Modeling
Hydrodynamics
Ele
vatio
n
Area
Ele
vatio
n
Volume
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Subgrid Modeling
Flow
Sediment
ElevationArea
Elevation
Area
Elevation
Area
Elevation
Area
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0 50 100 150 200 250-5.5
-5
-4.5
-4
-3.5
-3
-2.5
-2
-1.5
Time step
Ele
vatio
n, m
Bed Layering Example
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2D Prototype Model Validation
Bed
Cha
nge
(ft)
Cur
rent
Vel
ocity
(m/s
)C
once
ntra
tion
(mg/
L)
Elev
atio
n (ft
)
Fargo Model From MVP
HEC contacted several districts to find promising 2D validation data sets on the prototype scale and are acquiring data from MVS and NWP.
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2D Prototype Model Validation
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Non-Newtonian FlowFlow Type ModelHyperconcentrated Bingham PlasticMudflow Quadratic (Turbulent)Debris Flow Quadratic (Turbulent + Dispersive)
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Stochastic Sediment with HEC-RAS and HEC-WAT
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New 5.1 Sediment Results Viewer
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Questions?
Holtwood Dam, September 10, 2011 (TheGates1210 on YouTube)
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Bank-Bed Scour CalibrationHEC-RAS/BSTEM Model
of Missouri River D/S of Gavins Point Dam
BSTEM