265 PENLAND. S., SUTER, J. R. , and MCBRIDE, R. A. 1987. "Delta Plain 

 Development and Sea-Level History in the Terrebonne Coastal Region, 

 Louisiana," Proceedings of Coastal Sediments '87 . Vol II, pp 1689-1705. 



The Terrebonne coastal region is located on the south central portion 

 of the Mississippi River delta plain. The depositional history of this area 

 was investigated using vibracores , seismic profiles, radiometric dating 

 techniques and tide gage record analysis. A new chronostratigraphic model 

 depicting Lafourche and Teche delta complex development is presented. 

 Eustatic- enhanced and isostatic sea-level changes were delineated based on 

 the correlation of regressive and transgressive delta-plain sequences with 

 regional and localized ravinement surfaces. Tide gage analysis indicates the 

 Terrebonne coastal region is faced with potentially catastrophic land loss 

 conditions over the next century if current relative sea- level rise 

 acceleration rates of 1.03-1.28 cm/year continue. (Authors). 



266 PILKEY, 0. H., and DAVIS, T. W. 1987. "An Analysis of Coastal 

 Recession Models: North Carolina Coast," Nummedal , D., Pilkey, 0. H., and 

 Howard, J. D., eds . , Sea-Level Fluctuations and Coastal Evolution . Special 

 Publication No. 41, Society of Economic Paleontologists and Mineralogists, 

 Tulsa, OK, pp 59-70. 



Using the North Carolina barrier island shoreline as the test area, a 

 variety of simple geometric recession models has been applied to predict 

 shoreline erosion rates for various sea-level rise scenarios. All sea-level 

 rise scenarios assume no acceleration in rate of rise. South of Cape Lookout, 

 the slope of the migration surface predicts a much greater recession than 

 Bruun-related models. This suggests the possibility that the islands are in 

 an "out-of -equilibrium position" with respect to present sea-level. If this 

 is the case, the possibility exists that very rapid migration of the northern 

 islands will soon occur. 



The assumptions used in the present mathematical models depicting 

 shoreline retreat are generally weak. Better models are needed, especially 

 for shorelines where recession is part of the barrier island migration 

 process. The large number of types of islands in a wide variety of geologic 

 and oceanographic settings makes a universally applicable model difficult, if 

 not impossible, to formulate. (Authors). 



267 PILKEY, O.H., Jr., and HOWARD, J. D. 1981. "Saving the American Beach: 

 A Position Paper by Concerned Coastal Geologists," Skidaway Institute of 

 Oceanography Conference on America's Eroding Shoreline, Savannah, Georgia, 



PP 12. 



New approaches to the management of the American shoreline are urgently 

 needed to preserve our recreational beaches for future generations. Approxi- 

 mately half of the 10,000 miles of the "lower 48" American shoreline facing 

 the open ocean is under development pressure. Well over 2,000 miles are 

 considered by the U.S. Army Corps of Engineers to be in a state of critical 

 erosion. Erosion is occurring along almost all of the U.S. coast and when 



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