ISSUE NO. 2 - 1 April 1952 



II-E "Effective Height of Seawalls" by Kenneth Kaplan, Beach 

 Erosion Board 



A cocaprehensive discussion of the factors involved in 

 determining the efficiency of vertical face and curved 

 re-entrant face seawalls in turning back damaging wave 

 action. Criteria for height required for total effec- 

 tiveness and a basis for establishing relative effective- 

 ness of walls of lesser height are presented. 



I-D "Laboratory Study of an Electromagnetic Current Meter" 



Description of laboratory tests made to develop a meter 

 capable of measuring and recording internal water velo- 

 cities associated with wave motion. The electromagnetic 

 meter studied was unsatisfactory as the velocity-induced 

 voltages were to a great extent masked by chemically- 

 induced voltage. 



"Progress Reports on Research Contracts" 



Abstracts from progress reports on the several research 

 contracts in force between the Beach Erosion Board auid 

 universities of other institutions. Among a number of 

 other items, an abstract of a detailed report by Parker 

 D. Trask of the University of California based on his 

 inspection of the stationary sand bypassing plant at 

 SalinaCruz Harbor, Mexico is presented. Functional 

 aspects of the plant are reviewed and its operation 

 discussed. 



"Beach Erosion Studies" 



Summaries of completed cooperative study reports on Pawleys 

 Islajid, Edisto Beach and Hunting Island, South Carolina, 

 State of Cftiio-Fairport to Ashtabula, and State of Ohio - 

 Ashtabula to the Pennsylvania State Line are presented. 

 Listing of those cooperative studies still in progress is 

 also presented. 



ISSUE NO. 3 - 1 July 1952 



II -A "A Method of Separating Multiple Systems of Ocean Waves for 

 Detailed Study of Directions and Other Properties" by H. A. 

 Ward, Beach Erosion Board 



The technique described is applied to aerial photographs 

 whereby wave crests from obvious directions are blocked 



63 



