Preface 
In May 1996, the U.S. Army Engineer District, New York (New York 
District), requested the U.S. Army Engineer Waterways Experiment Station 
(WES), Coastal and Hydraulics Laboratory (CHL) to evaluate coastal processes 
and to determine contributing factors for the accelerated erosion of a newly 
constructed beach fill at Monmouth Beach, New Jersey. Ms. Lynn M. 
Bocamazo, Engineering Division, New York District, was the project study 
manager. WES is a complex of five laboratories of the U.S. Army Engineer 
Research and Development Center (ERDC). 
This report documents the subject study, which presented and evaluated 
hypotheses for the coastal processes contributing to the accelerated erosion at 
Monmouth Beach. The four hypotheses evaluated in this report are wave 
focusing by Shrewsbury Rocks, cross-shore beach profile adjustment, beach-fill 
end losses, and beach-fill planform adjustment. The study concludes by 
summarizing the evaluation of each hypothesis and presenting conceptual 
recommendations for mitigation of the high erosion rates. 
The study was performed by Mr. S. Jarrell Smith, Mr. Mark Gravens, and 
Dr. Jane M. Smith, Coastal Processes Branch (CPB), Coastal Sediments and 
Engineering Division, CHL. Work was performed under the supervision of 
Mr. Bruce A. Ebersole, Chief, CPB, and-Mr. H. Lee Butler (retired), former 
Chief of the former Research Division. Ms. J. Holley Messing, CPB, 
coordinated report preparation. 
The Director and Acting Assistant Director of CHL were Dr. James R. 
Houston and Mr. Thomas W. Richardson, respectively. 
At the time of report publication, Commander of ERDC was COL Robin R. 
Cababa, EN. 
The contents of this report are not to be used for advertising, publication, 
or promotional purposes. Citation of trade names does not constitute an 
official endorsement or approval of the use of such commercial products. 
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