T.M. No. 14 - March 1950 



Report on Beach Study in the Vicinity of Mugu Lagoon, California 

 by D. L. inman 



An investigation to determine the relative stability of beaches 

 and sand spits in the vicinity of Point Mugu and to make recommenda- 

 tions for their preservation. Beaches and sand spits bordering Mugu 

 Lagoon are not stable. Spring tide, high waves, and direction of lit- 

 toral transport affect the stability of the spits bordering Mugu Lagoon, 



T.M. No. 15 - January 1950 



Longshore Bars and Longshore Troughs by Francis P. Shepard 



Submerged longshore bars and longshore troughs which skirt the 

 shores off most sandy beaches are described and explained. The depths 

 of the bars and troughs are shown to be related to wave and breaker 

 heights. Analyses of hundreds of profiles taken mostly on the west 

 coast of the United States are the chief basis for conclusions. 



T.M. No. 16 - May 1950 



Accretion of Beach Sand Behind a Detached Breakwater by John W. Handin 

 and John C. Ludwick 



The problem of sand transport by longshore current is clarified 

 by observing effects of the detached offshore breakwater at Santa 

 Monica, California. Correlation is attempted between transporting 

 power of longshore forces, median grain sizes of the beach sand, and 

 the position of the breakwater. 



T.M. No. 17 - June 1950 



Test of Nourishment of the Shore by Offshore Deposition of Sand 

 by J. V. Hall, Jr. and W. J. Herron 



Field investigations to test the feasibility of nourishing eroded 

 shores with spoil from hopper dredges are reported. Test included 

 deposition, in 38 feet of water about half a mile offshore from Long 

 Branch, New Jersey, of about 600,000 cubic yards of sand dredged in 

 maintenance of New York Harbor channels, and a study of its movement 

 by natural forces. 



T.M. No. 18 - July 1950 



The Rayleigh Disk as a Wave Direction Indicator by J. V. Ha I I , Jr. 



The principles of operation of the Rayleigh Disk in stream flow 

 and wave systems are presented. Its erratic behavior as a wave- 

 direction gage under natural conditions at Long Branch, New Jersey 

 and Huntington Beach, California is discussed. 



