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
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