la highway 1
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LA HIGHWAY 1. Values and Vulnerabilities. 2011 Update illustrating the Frequency of Inundation over Louisiana Highway 1 between Golden Meadow and Leeville, LA. Illustrations calculated by NOAA Highway Elevations data by Dr. Roy Dokka. - PowerPoint PPT PresentationTRANSCRIPT
LA HIGHWAY 1LA HIGHWAY 1
Values and Vulnerabilities
2011 Update illustrating the Frequency of Inundation over
Louisiana Highway 1between Golden Meadow and
Leeville, LA
Illustrations calculated by NOAAHighway Elevations data by Dr. Roy Dokka
LA 1 is relied upon for State-of-the-art infrastructure efficiently servicing the GOM
Existing Deepwater Structures in GOM:90% are serviced by Port Fourchon!
LA 1 Toll Road Update January 2010
LA 1 is relied upon to service thousands of miles of GOM Pipelines
LOOP – America’s only Deepwater Oil Port capable of handling VLCC’s
LA 1 is the National Poster Child of Critical At-Risk Energy Infrastructure
3 Week Loss of Services of Port Fourchon National Economic Impacts:
• $9.9 Billion in Sales Loss *
• $2.9 Billion in Household Earnings Loss
• $77,440 Jobs Loss Nationally
* Based on $66/barrel Oil
Source: The economic impacts of Port Fourchon on the National and Houma MSA Economies.PREPARED BY: LOREN C SCOTT & ASSOCIATES, February 2008.
Bench Mark “8762084 B 1986” 1.24m
Leeville Station Datum 0.00m
Mean Higher High Water (MHHW) 1.21m
Local Mean Sea Level (MSL) 1.08m
Mean Lower Low Water (MLLW) 0.94m
Tidal Datum Elevations based on 1983-2001 Modified National Tidal Datum Epoch (2002-2006 MSL)
Leeville, LA NOAA Tide Station Bench Mark Elevation Relationship to Tidal and Geodetic Datums using data from 1987-1990
Elevation difference 0.78m
Highest observed water level 3/23/1987 1.53m
NAVD88 (1993) no longer published; LA-1 Average NAVD88 Elevation from Mallory (2011)(Note: There is a high degree of uncertainty in NAVD88 elevations due to ongoing subsidence)
1.56m“5%” Elevation of LA-1 (Golden Meadow to Leeville)
Elevation difference 0.03m
NOAA 2/2011
Estimated NAVD88 (1993) 0.78m
Estimated Effects of RSLR on Frequency and Duration of Inundation for Leeville, LA using observations 1987-1990 and then projecting this 4-year time period forward using
present rate of sea level rise
Using “5%” LA-1 elevation of 0.78m NAVD88 (1993)
Occurrences of Inundation
(over 4-years)Duration of Inundation
(over 4- years)Elevation Rise
Above 1990 MSL
4-yr Time PeriodRSLR rate mm/yr) (# of tides)
(hours (percent of total time)) (meters)
1987- 1990 9.24 0 0 (0%) -2027-2030 9.24 124 960(6%) 0.32047- 2050 9.24 1127 19163(55%) 0.62097- 2100 9.24 1334 33699(96%) 1.0
The elevation of LA-1 will become increasingly inundated even if the present day relative
sea level rise (RSLR) remains constant in the future.
Note: NAVD88 elevations for bench marks and for LIDAR elevations for road surface are only estimates and have significant uncertainty
“5%” Elevation of LA-1 Leeville to Golden Meadow
“5%” Elevation of LA-1 Leeville to Golden Meadow
“5%” Elevation of LA-1 Leeville to Golden Meadow
LA 1 Toll Road Update January 2010
Questions for Tim Osborn
NOAA Regional Manger
Eastern Gulf