Jeff Shelden, PE Moffatt & Nichol Project Scope Storm Surge Modeling – Historical & Hypothetical Storms

Wave Hindcasts – Historical & Hypothetical Storms

Determine Maximum Wave Crest Elevations

Statistical Analyses of Results

Evaluate Hurricane Katrina Probability

Evaluate Hypothetical Hurricane Probabilities

Establish Bridge Superstructure Elevations

Calculate Surge, Wave & Current Forces – Quasi-Static & Impact I-10 Bridge Replacement

Project Site

I-10 Bridge Replacement Significant Historic Hurricane Tracks Hypothetical Hurricane Tracks ADCIRC Model Bathymetry (LSU)

60 ft-NAVD

50 ADCIRC Model Bathymetry

40

30

20 I-10 Bridge

10

0 Storm Surge Modeling

16 ft-NAVD 14 Hurricane Katrina Storm Surge 12 10 8 6 4 2 0 Storm Surge Modeling

Hurricane Katrina

12.00 Point 101 WL

10.00 Point 102 WL Point 103 WL

8.00 Point 104 WL

Point 105 WL 6.00 Point 106 WL

Point 107 WL 4.00 Point 108 WL

Point 109 WL 2.00 Point 110 WL

Storm Surge (ft Surge Storm - NAVD) Point 111 WL 0.00 Point 112 WL

-2.00 Point 113 WL Point 114 WL

-4.00 Point 115 WL

Point 116 WL -6.00 170 175 180 185 190 Time (sec) Storm Surge Modeling

120 mph

100 Hurricane Katrina 1-Hour Wind Velocities

80

60

40

20

0 Storm Surge Results

Maximum Storm Event Surge (ft-NAVD) Hurricane Katrina 11.3 Sept 1915 Hurricane 10.1 Sept 1947 Hurricane 2.4 Hurricane Betsy 3.1 Hurricane Camille 6.0 Hurricane Andrew 4.3 Hurricane Lili 4.1 Hurricane Ivan 3.4 Hurricane Katrina West 16.2 Hurricane Katrina SE 11.4 Hurricane Katrina Strong 12.5

Wave Modeling

Hs (ft) HurricaneHurricane KatrinaKatrina WaveWave HeightsHeights

9 8 7 6 5 4 II--1010 BridgeBridge 3 2 1 0 Wave Results

Significant Maximum Peak Maximum Wave Event Wave Height Wave Height Wave Period Crest Elevation (ft) (ft) (sec) (ft-SWL) Hurricane Katrina 7.1 13.1 5.3 9.1 Sept 1915 Hurricane 6.3 11.7 4.8 8.0 Sept 1947 Hurricane 4.7 8.9 3.9 6.4 Hurricane Betsy 5.3 10.0 4.1 6.9 Hurricane Camille 5.3 9.9 4.4 6.5 Hurricane Andrew 3.4 6.4 3.5 4.1 Hurricane Lili 2.8 5.4 3.2 3.3 Hurricane Ivan 3.7 6.9 3.7 4.3 Hurricane Katrina West 9.2 16.8 6.0 12.0 Hurricane Katrina SE 7.0 12.9 5.0 9.0 Hurricane Katrina Strong 8.2 15.0 5.4 10.6

Crest Elevation Results

Maximum Wave Crest Elevation (ft-NAVD) Hurricane Sept 1915 Sept 1947 Hurricane Hurricane Hurricane Katrina Hurricane Hurricane Betsy Camille Andrew Point 101 18.5 15.5 7.8 10.9 12.3 7.8 Point 102 19.9 16.6 9.1 12.0 13.7 8.1 Point 103 20.8 17.4 9.5 12.8 14.6 8.5 Point 104 21.0 17.6 9.4 12.8 14.7 8.6 Point 105 21.4 18.1 9.1 13.0 14.9 8.9 Point 106 21.7 19.4 8.7 12.8 15.0 9.1 Point 107 21.9 18.7 8.1 12.5 15.0 9.2 Point 108 22.1 19.0 7.6 12.2 15.2 9.3 Point 109 22.2 19.2 7.2 12.2 15.2 9.5 Point 110 22.3 19.4 6.7 12.1 15.2 9.6 Point 111 22.4 19.6 6.3 12.2 15.0 9.6 Point 112 22.4 19.8 5.6 12.1 15.0 9.7 Point 113 22.3 19.8 4.7 11.9 14.8 9.8 Point 114 22.2 19.9 4.1 11.6 14.6 9.8 Point 115 21.9 19.8 3.4 11.3 14.4 9.7 Point 116 21.9 20.0 2.6 10.6 14.2 9.8 Point 117 20.6 18.8 n/a 8.1 12.6 8.9 Point 118 17.8 15.8 n/a n/a 9.8 n/a Crest Elevation Results

Maximum Wave Crest Elevation (ft-NAVD) Hurricane Lili Hurricane Ivan Hurricane Katrina West Hurricane Katrina SE Hurricane Katrina Strong

Point 101 7.4 9.2 24.5 16.9 20.4 Point 102 7.7 10.0 26.3 18.0 22.2 Point 103 .8.0 10.5 27.5 18.9 23.4 Point 104 8.0 10.5 27.9 19.1 23.7 Point 105 8.2 10.5 28.3 19.7 24.1 Point 106 8.4 10.6 28.8 20.2 24.5 Point 107 8.5 10.5 29.1 20.6 24.6 Point 108 8.6 10.5 29.2 20.9 24.7 Point 109 8.7 10.4 29.4 21.2 24.7 Point 110 8.7 10.4 29.6 21.5 24.8 Point 111 8.8 10.3 29.8 21.8 25.0 Point 112 8.8 10.0 30.1 22.0 25.2 Point 113 8.9 9.9 30.2 22.4 25.2 Point 114 8.8 9.7 30.1 22.5 25.1 Point 115 8.9 9.5 29.9 22.6 24.8 Point 116 8.9 9.3 29.9 22.7 24.7 Point 117 8.4 8.2 28.7 21.2 23.0 Point 118 n/a n/a 26.0 18.1 20.3 Crest Elevation Results

Maximum Wave Crest Elevation Event (ft-NAVD)

Hurricane Katrina 22.4

Sept 1915 Hurricane 20.0

Sept 1947 Hurricane 9.5

Hurricane Betsy 13.0

Hurricane Camille 15.2

Hurricane Andrew 9.8

Hurricane Lili 8.9

Hurricane Ivan 10.6

Hurricane Katrina West 30.2

Hurricane Katrina SE 22.7

Hurricane Katrina Strong 25.2 Crest Elevation Results

40

Hurricane Katrina West 35

30 Hurricane Katrina Strong

Hurricane Katrina 25 Sept 1915 Hurricane

Hurricane Katrina SE 20 Hurricane Camille Hurricane Betsy

Hurricane Ivan 15

Hurricane Lili Wave Crest Elevation (ft-NAVD) Elevation Crest Wave

10 Hurricane Andrew

Sept 1947 Hurricane 5

0 1 10 100 1000 Return Period (yrs) Hydrodynamic Loads

Original Structure Quasi – Static Forces: ~1500 kips Vertical, ~700 kips Horizontal Impact Forces: ~3500 kips Vertical, ~2100 kips Horizontal Hydrodynamic Loads FHWA Task Force

Bridges Vulnerable to Coastal Storms

Guide Specifications

Handbook of Retrofit Options