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Hurricane Katrina Materials

The Direct Impact of the Mississippi River Gulf Outlet on Hurricane Storm Surge

USACE, New Orleans, Louisiana District Office, 2007. Integrated Final Report to Congress and Legislative Environmental Impact Statement for the Mississippi River–Gulf Outlet Deep-Draft De-authorization Study. Washington D.C.: United States Government Printing Office, 256p.

URS. The Direct Impact of the Mississippi River Gulf Outlet on Hurricane Storm Surge. Performed under: CONTRACT NO. 2503-05-39, Hydrodynamic Modeling Effort for MRGO Study, Prepared for: State of Louisiana, Department of Natural Resources (February 2006)

The MRGO channel does not contribute significantly to peak surge during severe storms, when the conveyance of surge is dominated by flow across the entire surface of the coastal lakes and marsh. Nor does the channel contribute significantly to wave run-up. p. ES-2

Attachment: Numerical Modeling of Storm Surge Effect of MRGO Closure

Joannes Westerink et al., Note on the Influence of the Mississippi River Gulf Outlet on Hurricane Induced Storm Surge in New Orleans and Vicinity, US Army Corps of Engineers, Louisiana (2006).

All Figures from the USR report (large file) - these are also in the report.

Figure 1

Project Area

Figure 2

Corps Estimate of Regional Inundation from Category 4 and Above Storm Surge

Figure 3

LWRRI  Estimate  of  Regional  Inundation  from  Hurricane  Georges  (1998) Prior to Track Turn

Figure 4

Full 2003 ACIRC Grid

Figure 5

Detail of 2003 ADCIRC Grid for MRGO and Surrounding Area

Figure 6

3D Depiction of 2003 ADCIRC Terrain for MRGO and Surrounding Area

Figure 7

Comparison of Surveyed versus 2003 ADCIRC MRGO Channel Near Shell Beach, Plan

Figure 8

Comparison of Surveyed versus 2003 ADCIRC MRGO Channel Near Shell Beach, Cross Section

Figure 9

Tracks for Hurricane Simulations

Figure 10

3D Depiction of 2003 ADCIRC Terrain with Closed MRGO

Figure 11

Maximum WSE for 124-Knot-Fast Storm, Baseline MRGO

Figure 12

Maximum WSE for 124-Knot-Fast Storm, Closed MRGO

Figure 13

Difference  in  Maximum  WSE  for  124-Knot-Fast  Storm,  Baseline  versus Closed MRGO

Figure 14

Storm  Surge  Stage  Hydrographs,  124-Knot-Fast  Storm,  Baseline  versus Closed MRGO

Figure 15

Maximum WSE for Hurricane Betsy, Baseline MRGO

Figure 16

Maximum WSE for Hurricane Betsy, Closed MRGO

Figure 17

Difference in Maximum WSE for Hurricane Betsy, Baseline versus Closed MRGO

Figure 18

Storm Surge Stage Hydrographs, Hurricane Betsy, Baseline versus Closed MRGO

Figure 19

Storm Surge Current Speed Hydrographs, Hurricane Betsy, Baseline versus Closed MRGO

Figure 20

Hurricane Katrina Simulation

Figure 21

Maximum WSE for Hurricane Katrina, Baseline MRGO

Figure 22

Maximum WSE for Hurricane Katrina, Closed MRGO

Figure 23

Difference in Maximum WSE for Hurricane Katrina, Baseline versus Closed MRGO

Figure 24

Storm Surge Hydrographs, Hurricane Katrina, Baseline versus Closed MRGO

Figure 25

Storm Surge Current Speed Hydrographs, Hurricane Katrina, Baseline versus Closed MRGO

Figure 26

Baseline 2003 ADCIRC Levees

Figure 27

Modified Levees

Figure 28

Maximum WSE for Hurricane Katrina, Modified Levees and Closed MRGO

Figure 29

Difference  in  Maximum  WSE  for  Hurricane  Katrina,  Baseline  versus Modified Levees

Figure 30

Storm  Surge  Hydrographs,  Hurricane  Katrina,  Baseline  versus  Modified Levees

Figure 31

Schematic of Wave Set-up and Run-up

Figure 32

HPL Cross Section near Bayou Dupre, Station 673

Figure 33

Lake  Borgne  to  HPL  Levee  @  Bayou  Dupre  Transect  for  Wave  Run-up Analysis

Figure 34

Schematic of Wave Generation and Attenuation for Lake  Borgne to HPL Levee @ Bayou Dupree

Figure 35

3D  Depiction  of  Higher  Resolution  ADCIRC  Terrain  for  MRGO  and Surrounding Area with Closed MRGO

 

 

 

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