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www.jacobs.com | worldwide
BENCHMARKING 2D MODELS - HEC-RAS 5.0 versus INFOWORKS ICM
September 3rd, 2015 – Presented to TFMA Fall Technical Summit
By:Tom Davies, PE; Hydraulics Group Lead - North Texas Water ResourcesMayank Mehta, PE; Hydraulic Engineer - North Texas Water Resources
Why 2D?
2
UK Environment Agency benchmarking of 2D Software Packages
• Benchmark 2010 – 14 packages
• Benchmark 2013– 19 packages
4
Test 1: Flooding a disconnect water body
5
Test 2: Filling of floodplain depressions
Test 3: Momentum conservation over a small obstruction
Test 4: Speed of flood propagation over an extended floodplain
Test 5: Valley floodingTest 6: DambreakTest 7: River and floodplain linkingTest 8: Surface flow from a surcharging sewer in urban areas
Test 1: Flooding a disconnect water body
6
Profile of digital elevation model used in Test 1
Test 1/8
Test 1 – HEC-RAS – water filling up
7
Test 1/8
Test 1 – HEC-RAS – water receding
8
Test 1/8
Test 1 – InfoWorks ICM
9
Test 1/8
10
Profile of digital elevation model used in Test 1
Test 1/8Water Level at Point 1
Water Level at Point 1
11
100
9.9
9.95
10
10.05
10.1
10.15
10.2
10.25
10.3
10.35
10.4
0 2 4 6 8 10 12 14 16 18 20
Test 1/8
12
Test 2: Filling of floodplain depressionsTest 2/8
13
Test 2/8
Test 2 – InfoWorks ICM
14
Test 2/8
Water Level at Point 4
15
9.2
9.3
9.4
9.5
9.6
9.7
9.8
0 5 10 15 20
S
Test 2/8
Water Level at Point 5
16
7.9
8
8.1
8.2
8.3
8.4
8.5
0 5 10 15 20 25 30 35 40 45
Test 2/8
Test 3: Momentum conservation over a small obstruction
17
Test 3/8
Test 3 – HEC-RAS
18
Test 3/8
Test 3 – InfoWorks ICM
19
Test 3/8
20
Test 3/8
Water Level at Point 1
Water Level at Point 1
21
9.7
9.75
9.8
9.85
9.9
9.95
10
10.05
10.1
10.15
0.00 100.00 200.00 300.00 400.00 500.00 600.00
Series1
Test 3/8
Test 4: Speed of flood propagation over an extended floodplain
22
Test 4/8
Test 4 – HEC-RAS
23
Test 4/8
Test 4 – InfoWorks ICM
24
Test 4/8
25
Test 4/8Water level at Point 3
Water level at Point 3
26
0
0.1
0.2
0.3
0.4
0.5
0 50 100 150 200 250 300
Series1
Test 4/8
Test 5: Valley flooding
27
Test 5/8
Test 5 – HEC-RAS
28
Test 5/8
Test 5 – InfoWorks ICM
29
Test 5/8
30
Test 5/8Water Level at Point 3
Water Level at Point 3
31150
151
152
153
154
155
156
157
158
159
0 2 4 6 8 10 12 14 16 18 20
Test 5/8
Velocity at Point 3
32
0
0.5
1
1.5
2
2.5
3
3.5
0.5 1 1.5 2
Test 5/8
Test 6: Dambreak
33
Test 6/8
Test 6 – HEC-RAS
34
Test 6/8
Breach in HEC-RAS
35
Test 6/8
Test 6 – InfoWorks ICM
36
Test 6/8
Test 6 – HEC-RAS – Velocity – Momentum Equation
37
Test 6/8
Test 6 – HEC-RAS – Velocity – Diffusion Equation
38
Test 6/8
Hydraulic Jump – erosion protection
1. Before Dam break or spill over
39
Test 6/8
Hydraulic Jump – erosion protection
1. At Dam Break
40
Test 6/8
Hydraulic Jump – erosion protection
1. Hydraulic Jump occurs after dambreak
41
Test 6/8
42
Test 6/8
Water Level at Point G2
Water Level at Point G2
430
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
0 10 20 30 40 50 60
Test 6/8
Test 7: River and floodplain linking
44
Test 7/8
Test 7 – HEC-RAS
45
Test 7/8
Test 7 – InfoWorks ICM
46
Test 7/8
Test 8A: Rainfall and point source surface flow in urban areas
47
Test 8B: Surface flow from a surcharging sewer in urban areas
Test 8/8
HEC-RAS beta does crash more often than you would expect…
50
Not so user friendly error messages…
1. Cells without cell center2. Cells with more than 8 faces51
Key Differences between HEC-RAS and InfoWorks ICM
2D domain dynamically linked to a 1D river and sewer network engine
Sewer Network – integrating modeling
Does everything within one package so doesn’t link with other packages
Flexible mesh – allows user friendly meshing interface
Speed of running and robustness/stability of run
Allows for Direct Rainfall modelling
QA/QC tools
Expensive
www.jacobs.com | worldwide3 September 2015 Jacobs© Copyright
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