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20. Abstract (Continued) 



by wave attack; that subsidence ranging from about 3 inches to 1.5 feet has 

 occurred, mainly due to the deterioration of some inferior material in the 

 revetment; that littoral transport has been almost unaffected; that adjacent 

 bottom topography shows minor changes; and that a large, thriving community 

 of marine organisms has developed in the environment created by the island. 

 The report includes recommendations for instrumentation to provide measurement 

 of waves and nearby bottom sedimentation. 



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