Volume 6, No. I (Continued) 



Discussion - A Method for Drawing Orthogonals Seaward from Shore 



Points out that R. W. Lome, formerly with the San Francisco 

 District, had previously developed a method for solving this problem 

 without the need for special protractors. Written by Kenneth Kaplan, 

 U. S. Army Engineer District, San Francisco. 



On the Expansion of Sea Waves Due to the Effect of Wind 



An abstract of the translation from a German paper by Hans Ulrich 

 Roll which appeared in "Deutsche Hydrograph ische Zeitschrift" in 1949. 

 Wave and wind measurements made in tidal waters of "Neuwerk Shallows" 

 in the North Sea are compared with theoretical results based on 

 methods of Sverdrup and l^unk. Differences are pointed out and 

 discussed. However, the author regards the results of the Neuwerk 

 measurements as a verification of the Sverdrup-Munk theory. 



The Generation of Water Waves by Wind 



An abstract of the translation from a German paper by Gerhard 

 Neumann which appeared in "Deutsche Hydrograph i sche Zeitschrift" in 

 1949. A new treatment of theory of wave generation by wind is pre- 

 sented. Height and length of initial waves generated by incident 

 winds of different velocities for both deep and shallow water are 

 computed and compared. 



Volume 6, No. 2 - Apri I 1952 



Effective Height of Seawalls 



A discussion of the factors involved in determining the effici- 

 ency of vertical face and curved re-entrant face seawalls in turning 

 back damaging wave action. Criteria for height required for total 

 effectiveness and a basis for estabi ishing relative effectiveness 

 of walls of lesser height are presented. Written by Kenneth Kaplan. 



Laboratory Study of an Electromagnetic Current Meter 



Description of laboratory tests made to develop a meter capable 

 of measuring and recording internal water velocities associated with 

 wave motion. The electromagnetic meter studied was unsatisfactory as 

 the velocity- induced voltages were masked to a great extent by 

 chemically i nduced- vol tage. 



Sand Bypassing Plant at Sa I i na Cruz, Mexico 



An abstract of a detailed report by Parker D. Trask of the Univer- 

 sity of California based on his inspection of the stationary sand by- 

 passing plant at Sa I i na Cruz Harbor is presented. Functional aspects 

 of the plant are reviewed and its operation discussed. 



55 



