BEACH EROSION LITERATURE 



There are listed below some recent acquisitions to the Board's 

 library which are considered to be of general interest. Copies of 

 these publications can be obtained on 30-day loan by interested 

 official agencies. 



"Refraction of Shallow Water Waves: The combined effect of currents 

 and underwater topography," 1 Trans. American Geophysical Union, 

 Vol. 31, Mo. A 



This paper gives a solution for determining the re- 

 fraction effect according to Fermat's Principle for shallow 

 water waves moving in any given distribution of currents and 

 depth. Application is made to an analytic model of an intense 

 rip current and the results are compared to actual rips. 



"A Method of Measuring Electrically the Velocity of Fluids, w B. 

 Thurlemann 



This paper discusses the theory on which an ocean current 

 velocity meter is developed and also discusses the construction 

 cf a model instrument based on this theory. 



"The Limitations of the Principle of Superposition,"' Paul E. Heyi, 

 Jour. Washington Academy of Sciences, Vol. 40, No. 11, 1950. 



This paper gives a brief discussion of the principle 

 of superposition as applied to harmonic analysis of wave 

 forms. Several allowable and several erroneous applications 

 of the principle are discussed which are of interest to 

 engineers studying wave forms such as xvind waves and bides. 



"Model and Prototype Stuides for the Design of Sand Traps, " R. L. 

 Par shall, July 1950 



The hydraulic laboratories at Fort Collins have made various 

 investigations to develop a means for ridding channels of bed 

 load deposits. Out of these investigations come two practical 

 means, namely the vortex tube and the ripple deflector-vortex 

 tube sand traps which are discussed in this paper. 



"Turbidity Currents as a Cause of Gradsd Beddings Jour, of Geology, 

 Vol. 58, No. 2, March 1950. 



This paper discusses the causes and magnitude of 

 particle grading by the action of turbidity currents. 

 Naturally observed grading and artificially produced grading 

 are described. 



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