New Orleans Levee Failure Physical Modeling Mateo Arimany

New Orleans Levee Failure Physical Modeling Mateo Arimany Albert 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

Background Geography Orleans Area 5 Parishes 350 Miles of Levee/Floodwall 73 Pumping Stations (Fed & Non-Fed 4 Gated Outlets

Legend Federal Federal Non-COE Non-Federal 17TH St.

Canal 1878 6 Hurricane Betsy 1965

Lake Ponchartrain B A NEW ORLEANS

.R S S I M New Orleans Topography

Lake Ponchartrain City of New Orleans Ground Elevations B

A Floodwall Along Mississippi River .R

S S I M 23 FT

20 Project design flowline (18 feet) 10

B London Avenue Canal floodwall 20 10

Ban k Po La nt ch ke -10 Sh artr

or ain e Uno Side Of Wainwright Dr WAINRIGHT DR

AT L. C. SIMON St Anthony At Filmore Ave Gentilly Blvd At Allen

Dillard Univ Campus Derbigny At I-10 Esplanade At St. Claude

0 St Louis Cathedral i

Canal St At River -20 Rive r

0 -10 30

HURRICANE LEVEE / FLOODWALL (14.0 FEET) Mi ss iss i pp

Elevations In Feet Ngvd NEW ORLEANS A

30 From Canal St. at Mississippi River to the Lakefront

-20 Hurricane Katrina Aug, 2005 Hurricane Hurricane Rita

Rita Sep, 2005 Sep 24, 2005 One of Americas largest natural disasters

Cat 4 less than 12 hrs before landfall

Cat 5 less than 12 hrs before landfall 127 MPH wind at Louisiana landfall

175 MPH max sustained winds in Gulf of Mexico Maximum surge of 28 to 30 feet along

Mississippi coast 120 MPH max sustained winds at landfall

Cat 3 strength at landfall City of New Orleans flooded 9

10 New Orleans Maximum Flooding Depth 10 to 13 feet

8 to 15 feet 12 to 15 feet High: 15 Ft.

Low: 0 Ft. Design Failure Breach Locations

9 to 11 feet As of 4 NOV 05 Investigation Investigation

Investigation Physical Modeling Team Michael K. Sharp, PhD, PE Wipawi Vanadit-Ellis, MS

Wayne Hodo Henry Blake David Daily Dave Carnell Prof Tarek H. Abdoun, PhD Prof Thomas F. Zimmie, PhD, PE

Inthuorn Sasanakul, PhD Javier Ubilla, MS Marcelo Gonzalez, MS Hassan Radwan Alex Sankovich Dominic Moffitt

R. Scott Steedman, PhD FREng FICE Kevin Stone, PhD Prof Dr Ir Frans Barends Paul Schamine , MSc Adam Bezuijen, MSc

London North Model London South Model Orleans South Model Test

Vide o ERDC Centrifuge RPI Centrifuge

London South sand foundation Sand layer pile tip local shear failure London South sand foundation

Typical cross section Wall hydrostatic force

crumple zone Swampy Marsh limiting shear force on underside of peat

Pivot limiting passive resistance in sand rising water pressure decreases vertical effective stress London South sand foundation

17th Street clay foundation 17th Street clay foundation Top of clay layer

general shear failure Key findings 1. Wall movement was in all cases sufficient to form a crack in front of

the wall. 2. The centrifuge models were consistent and useful to determine mechanisms in all cases studied. 3. Performance of all levee sections studied 17th Street, London Avenue and Orleans was consistent with field

observations and numerical models. 4. Uplift of swampy marsh leads to unloading. Pivot Swampy Marsh

Lessons Learned - System Improvements: Repair Improve Correct Floodwall

Deficiencies Storm Proof Pump Stations

Permanent Pump Stations Surge Barrier 62

IHNC Lake Borgne 64 Summary

Background - Bleakley Geography Outfall canals Levees Hurricane Katrina - Bleakley Effects Failures

Investigation - Arimany Borings/CPT/soil testing Centrifuge modeling Lessons learned - Bleakley Questions?

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