Full document / COSOC-W-86-002 - the National Sea Grant Library
Full document / COSOC-W-86-002 - the National Sea Grant Library Full document / COSOC-W-86-002 - the National Sea Grant Library
Estuarineand Coastal Management- Toob ofthe Trade. Proceedings of the TenthNationalConference of The Coastal Society. October 12-15.1986. New Orleans.LA. Copyrightby TheCoastalSociety 1987. Introduction RELATIVE SEA LEVEL RISE AND SUBSIDENCE MEASUREMENTS IN THE GULF OF MEXICO BASED ON NATIONAL OCEAN SURVEY TIDE GAUGE RECORDS SheaPenland, Karen Ramsey,andRandy A. McBride LouisianaGeological Survey University Station, Box G Baton Rouge. LA 70893 Coastal erosion in Louisiana Louisiana is experiencing the most severe land loss and barrier island erosion problem In the United States (Fig. 1). Land loss rates in the Mississippi River delta plain exceed 102 km2 per year (Gagliano et al. 1981). Louisiana experienced a decrease in total barrier island area of about 37 percent, from 92.4 km2 to 57.8 km2 between 1680 and 1979 (Penland and Boyd, 1981, 1982). Current predictions indicate the entire Plaquemines Parish delta plain will be converted into open water within 52 years, based on a land loss rate of 35.73 km2 per year and that the entire Terrebonne delta plain will be converted into open water within 102 years, based on a land loss rate of 27.7 km2 per year (Gagliano et al., 1981). Between 1887 and 1979, the Terrebonne Parish barrier islands decreased in area from 48.3 km2 to 18.3 km2. At a rate of 0.326 km2 these islands will be converted to submerged sand shoals in 56 years (Penland and Boyd, 1981; Fig. 2). Rapid relative sea level rise induced by delta plain subsidence and combined with a deficit of terrigenous wetland sedimentation are the primary factors driving the rapid deteri oration of the Louisiana coastal zone. Previous sea level rise studies Previous Investigations have documented that the analysis of tide gauge records is a valid technique for measuring relative sea level rise and 661
662 !- LAM) CHAMCI lUTtt — •» _^r IUmW'Vtl^y .«•"•*"•!»t&nm "* It 4 M< ».4 lOUSUJU COUTai ion LAND CHANGE RATES 1055-1078 | t«rf —— (Ml •MXiMI Figure 1. Louisiana Is experiencing the highest rates of land loss in North America (Gagliano et al., 1981).
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- Page 246 and 247: PREPARING FOR EMERGENCIES James McQ
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- Page 270 and 271: elative sea level rise is 0.33 cm/y
- Page 272 and 273: References Byrne, P., Borengasser,
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662<br />
!-<br />
LAM) CHAMCI lUTtt<br />
— •» _^r<br />
IUmW'Vtl^y<br />
.«•"•*"•!»t&nm "*<br />
It 4 M<<br />
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lOUSUJU COUTai ion<br />
LAND CHANGE RATES 1055-1078<br />
| t«rf —— (Ml<br />
•MXiMI<br />
Figure 1. Louisiana Is experiencing <strong>the</strong> highest rates of land loss in<br />
North America (Gagliano et al., 1981).
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