Hurricane Flood Protection and Coastal Restoration

Hurricane Flood Protection and Coastal Restoration

Joseph N. Suhayda

Louisiana Workforce CommissionSummit

October 22, 2008

Joseph N. Suhayda

Louisiana Workforce CommissionSummit

October 22, 2008

South East Louisiana Coast (LANDSAT 1993)

Topography of SE Louisiana Coast

18391839

18701870

19301930

19931993

20202020

20902090

Multiple Lines of DefenseMultiple Lines of Defense

Strategy Adopted by LACPR and CPRAStrategy Adopted by LACPR and CPRALPBF

WHAFIS Wave Heights

0

1

2

3

4

5

6

7

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500

Distance, ft

Wav

e H

eigh

t, ft Open Water

BayMarshTrees

Restored LandscapeRestored Landscape

Modified:

- bathy/topo (~+1.5 ft NAVD88)

- Mannings-n

- Wind reduction factorBased on type

1-Saline, n= 0.035, z0=0.11

2-Intermediate, n=0.040, z0=0.11

3-Brackish, n=0.040 , z0=0.11

4-Freshwater, n=0.045 , z0=0.11

5-Wetland forest, n=0.15 , z0=0.55

Restored LandscapeRestored Landscape

Storm: cp=900mb, rmax=21.8nm, Vf=11kt

Peak Water Level Restored - Base

Restored LandscapeRestored Landscape

Storm: cp=900mb, rmax=14.9nm, Vf=11kt

Peak Water Level Restored - Base

Future NIA Landscape ChangesFuture NIA Landscape Changes

purple = degradedblue = improved

Future NIAFuture NIA

Storm: cp=900mb, Rmax=21.8nm, Vf=11kt

Peak Water Level NIA - Base

Future NIAFuture NIA

Storm: cp=900mb, Rmax=14.9nm, Vf=11kt

Peak Water Level NIA - Base

Comparison of 100-yr Water LevelComparison of 100-yr Water Level