" Beach Erosion Studies " 



Summaries of completed cooperative study reports on Barnegat 

 Inlet to Cape May Canal, New Jersey, and South Kingstown and 

 Westerly, Rhode Island, are presented. Listings of all com- 

 pleted cooperative study reports and those studies still in 

 progress are also presented. 



Volume 14 - July 1960 



" Sealing of Mission Bay Jetties, San Diego, California " 



Grouting of the north jetty to make it impermeable to the 

 passage of sand through the jetty into the navigation channel 

 is described and illustrated with a number of photographs. 

 Materials selected for the grout mixture, details of the 

 equipment and placement operation, and costs are also 

 discussed. 



"Preliminary Considerations of the Use of Radioisotopes 

 for Laboratory Tracer Techniques " 



Preliminary results of an investigation of the feasibility of 

 utilizing radioactive tracers in laboratory studies of sedi- 

 ment movement are presented. Feasible objectives obtainable 

 through this use, choice of carrier and radioactive label are 

 discussed, and potential dose rate calculated. 



" Experimental Determination of Wave Pressure Attenuation " 



Utilizing controlled wave conditions in a laboratory wave 

 tank, simultaneous measurement of surface fluctuation and 

 bottom pressure was made and compared with pressure fluc- 

 tuation computed from wave theory. Correction factors 

 obtained in this manner averaged 1.12, in general agreement 

 with the value of 1.1 previously indicated by work at the 

 University of California. 



" Progress Reports on Research Sponsored by the Beach 

 Erosion Board " 



Summaries of progress made during the previous year on the 

 several research contracts in force between universities 

 or other institutions and the Beach Erosion Board, together 

 with brief statements regarding the status of some research 

 projects being prosecuted in the Board* s laboratory, are 

 presented. 



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