Overview of 2D Unsteady Flow
Modeling with HEC-RAS
Stanford Gibson, PhD
Models by:
Gary Brunner, P.E., D. WRE, M.ASCE
1
1D Model with a 2D Levee Area
2
Saint Paul 1D/2D
Levee - Animation
3
1D Main Channel with 2D
Overbanks
US BC 4
1D Channel with 2D
Overbanks - Animation
5
Detailed 1D/2D Model
Sacramento River System
Model
6
Sacramento River System Model
7
Natomas,
California
8
Monticello
Dam
Breach
Example
9
Monticello Dam
Breach Example
10
Oroville Dam – Failure Analysis
11
Oroville Dam – Failure Analysis
12
Oroville Dam – Failure Analysis
13
14
2D Bridge
Modeling
Internal Boundary
Highway 120 B2
600 Legend
Tailwater Curv es
590
Free Flow Curv e
H e a d W a te r E le va t io n ( ft )
580
570
560
550
540
530
0 50000 100000 150000 200000
Flow(cf s)
250000 300000 350000
15
16
Detailed Gate Modeling– Orleans Canal
Detailed Gate Modeling– Orleans Canal
18
19
Gridded Precipitation
and Infiltration
Santa Barbara Mud-and-Debris Flow
23 Fatalities
Damages:
$200 Million
21
22
https://doi.org/10.3390/geosciences12030134
Non-Newtonian Hydraulics
23
Hurricane Laura Precipitation
24
Hurricane
Laura
Wind
Field
25
Hurricane
Laura
Water
Surface
26