R. 1-67 - January 1967 



Coastal Processes and Beach Erosion by Joseph M. Caldwel I 



Capsulized explanation of the principal coastal processes 

 affecting shore erosion, along with apt correlation to what is 

 actually happening on the ocean shores of New Jersey. 



R. 2-67 - August 1967 



Wave Tests of Revetment Using Machine-Produced Interlocking Blocks 

 by Jay V. Hal I, Jr. 



This paper, given at the Tenth Coastal Engineering Conference in 

 Tokyo, September 1966, reports on the testing of lightweight block 

 revetments in the Large Wave Tank at CERC. Two types of blocks were 

 tested: one a machine-produced tongue-and-groove type, the other a 

 hand-produced shiplap type. Observations were made of the displace- 

 ment of blocks and the vertical movement of the face of the slope. 

 Tests showed that the machine-produced tongue-and-groove blocks have 

 greater stability than the hand-produced shiplap type. Data derived 

 from the tests have been used in the development of a machine-produced 

 block which remained stable under the continuous attack of 4.7-second, 

 4.8-foot breaking waves. 



R. 5-67 - August 1967 



Rock Movement in Large-Scale Tests of Riprap Stability Under 

 Wave Action by Thornd i ke Savi I le, Jr. 



This paper, given at the Tenth Coastal Engineering Conference in 

 Tokyo, September 1966, is a summary of a presentation based mainly on 

 "time- 1 apse" motion pictures. Two rubble revetments were tested by 

 waves in the Large Wave Tank at CERC. The first revetment was com- 

 posed of Kimmswick limestone; the median weight of the pieces was 

 120 pounds. Major damage was initiated with a wave 3.45 feet high; 

 severe damage occurred with a wave 3.75 feet high. The other revet- 

 ment was characterized by a top layer of 80-pound tribars. In this 

 test damage was initiated by a wave 4.05 feet high; severe damage 

 occurred with a wave 4.35 feet high. 



R. 4-67 - September 1 967 



Variations in Groin Design by Dennis W. Berg and George M. Watts 



Considering all structures used for shore protection, the groin 

 is probably the most widely used and yet is is perhaps the one struc- 

 ture least understood. This lack of understanding of all factors 

 affecting the functional and structural design of groins has led to 

 seemingly endless variations in groin design. This paper points out 

 pertinent features of basic types of groins and illustrates some of 

 the many variations which have been built in the United States. 



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