Volume 5, No. 2 (Continued) 



Surveying in Haze and Fog 



A mercury vapor lamp installed on the hydrographic survey vessel 

 used by the Field Research Group increased its visibility from shore 

 by 50 to. 75 percent when operating in haze and fog off the Southern 

 California coast. Time lost while surveying' in haze and fog was 

 reduced by 50 percent during operations extending over a period of 

 several months. 



Volume 5, No. 5 - July 1949 



Beach Erosion Board Research 



Extracts from a speech by Lt. Colonel William B. Stel zenmu I I er 

 at the Great Lakes Conference on Lake Shore Erosion Control Problems 

 in May 1949. Mission and research program of the Beach Erosion Board 

 are briefly outlined. 



New Jersey Creates Beach Erosion Committee 



The State of New Jersey by action of its Legislature 9 April 1949 

 provided for creation of a commission to consider and provide ways 

 and means to protect and preserve the beaches and shore front of the 

 State by the erection and construction of protective works, dredging, 

 and other suitable methods. The enabling act is quoted. 



The Causes of Plunging and Spilling Breakers 



Notes prepared by Dean M. P. O'Brien, University of California, 

 January 1946. Conditions causing plunging and spilling breakers are 

 listed as determined from field observations and photographs. The 

 role of bottom slope and wave steepness and ratio of breaker height 

 to water depth are discussed. 



Discussion - A Formula for the Calculation of Rock Fill Dikes 



Points out that for protection against wave action or erosion 

 due to river currents, a homogeneous non-erosible monolith of sand 

 asphalt mixtures is preferable to heterogeneous masses of riprap 

 even if rock sizes are adequate. Cites discussion in Proceedings 

 of ASCE, December 1948. Written by R. M. McCrone, Lower Mississippi 

 Valley Div is ion, .Corps of Engineers. 



Comite Central D'Oceanograph ie et D'Etude des Cotes 



Briefs of information of general interest contained in periodic 

 Information Bulletin issued by above French organization. Includes 

 notes on erosion and protective measures at Pointe de Grave, France, 

 description of the Center for Research and Oceanograph ic Studies, 

 and description of a recording monometer for submarine pressures. 



49 



