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New Orleans Levee Failure Physical Modeling Mateo Arimany Albert Bleakley February 2010
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Transcript of New Orleans Levee Failure Physical Modeling Mateo Arimany Albert Bleakley February 2010
New Orleans Levee Failure
Physical Modeling
Mateo ArimanyAlbert Bleakley
February 2010
Outline Background - Bleakley
• Geography• Outfall canals• Levees
Hurricane Katrina - Bleakley• Effects• Failures
Investigation - Arimany• Borings/CPT/soil testing• Centrifuge modeling
Lessons learned - Bleakley
Legend Federal Federal Non-COE
Non-Federal
5 Parishes350 Miles of Levee/Floodwall73 Pumping Stations (Fed & Non-Fed)4 Gated Outlets
Background – Geography Orleans Area
6
1878
17TH
St.
Cana
l
NEWORLEANS
A
B
Lake Ponchartrain
MISS. R
Hurricane Betsy 1965
City of New Orleans
Ground Elevations
From Canal St. at Mississippi River
to theLakefront
Miss
issipp
iRi
ver B
ank
LakePontchartrain
Shore
NEWORLEANS
A
B
Lake Ponchartrain
MISS. R A
Project designflowline (18 feet)
Der
bign
y At
I-10
Espl
anad
e At
St. C
laud
e
Cana
l St
At R
iver
St L
ouis
Cath
edra
l
Gen
tilly
Blv
dAt
Alle
nD
illar
d U
niv
Cam
pus
St A
ntho
ny A
tFi
lmor
e Av
e
WAI
NRI
GH
T D
RAT
L. C
. SIM
ON
Uno
Sid
e O
fW
ainw
righ
t D
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London Avenue Canal floodwallHURRICANE LEVEE / FLOODWALL (14.0 FEET)
30
20
10
0
-10
-20
30
20
10
0
-10
-20Elev
atio
ns In
Feet
Ngv
d
Floodwall AlongMississippi River
23 FT
New Orleans Topography
B
Hurricane KatrinaAug, 2005
One of America’s largest natural disasters Cat 5 less than 12 hrs before landfall 127 MPH wind at Louisiana landfall Maximum surge of 28 to 30 feet along
Mississippi coast City of New Orleans flooded
Cat 4 less than 12 hrs before landfall 175 MPH max sustained winds in Gulf of
Mexico 120 MPH max sustained winds at landfall Cat 3 strength at landfall
9
Hurricane RitaSep 24, 2005
Hurricane RitaSep, 2005
10
8 to 15 feet
10 to 13 feet
12 to 15 feet
9 to 11 feet
High: 15 Ft.
Low: 0 Ft.
Design Failure Breach Locations
New OrleansMaximum Flooding Depth
As of 4 NOV 05
Investigation
Investigation
Investigation
Physical Modeling Team
Prof Tarek H. Abdoun, PhDProf Thomas F. Zimmie, PhD, PEInthuorn Sasanakul, PhDJavier Ubilla, MSMarcelo Gonzalez, MSHassan RadwanAlex SankovichDominic Moffitt
Michael K. Sharp, PhD, PEWipawi Vanadit-Ellis, MSWayne HodoHenry BlakeDavid DailyDave Carnell
R. Scott Steedman, PhD FREng FICEKevin Stone, PhD
Prof Dr Ir Frans BarendsPaul Schaminée , MScAdam Bezuijen, MSc
London North Model
London South Model
Orleans South Model
ERDC Centrifuge
RPI Centrifuge
Test Video
London South – sand foundation
Sand layer pile tip local shear failure
London South – sand foundation
limiting shear force on underside of peat
limiting passive resistance in sandPivot
hydrostatic force
Wall
Swampy Marsh
‘crumple zone’
rising water pressure decreases vertical effective stress
Typical cross section
London South – sand foundation
17th Street – clay foundation
17th Street – clay foundation
Top of clay layer general shear failure
Pivot
Key findings
2. The centrifuge models were consistent and useful to determine mechanisms in all cases studied.
1. Wall movement was in all cases sufficient to form a crack in front of the wall.
3. Performance of all levee sections studied 17th Street, London Avenue and Orleans was consistent with field observations and numerical models.
Swampy Marsh
4. Uplift of swampy marsh leads to unloading.
Lessons Learned - System Improvements:
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Permanent Pump
Stations
Repair Correct Floodwall DeficienciesImprove
Storm Proof Pump
Stations
Surge Barrier
IHNC Lake Borgne
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Summary Background - Bleakley
• Geography• Outfall canals• Levees
Hurricane Katrina - Bleakley• Effects• Failures
Investigation - Arimany• Borings/CPT/soil testing• Centrifuge modeling
Lessons learned - Bleakley
Questions?