NO. 102 - October 1957 



II-B "A Method for Specification of Sand for Beach Fills" by 

 E W. C. Krumbein 



Factors involved in selection of suitable material for 

 beach fills are examined. Properties of natural beach 

 materials governing specifications for a beach fill 

 are discussed. Procedure for analysis of materials 

 available for use as fill is presented which permits 

 selection of that material most nearly satisfying 

 requirements, or which, after consideration of comparative 

 costs of material from alternative sources, will be most 

 economical to employ without sacrificing the benefits 

 sought. The report is concerned with the methods of 

 interpreting data obtained by sampling with particular 

 regard to the employment of statistical analysis as it 

 may be applicable to objectives described above. 



NO. 103 - December 1957 



I-A "Model Study of Wave Refraction" by R. L. Wiegel ami A. L. 

 Arnold 



Tests were made in a laboratory wave tank to verify 

 applicability of Snell's Law in water wave refraction. 

 Results indicate Snell*s Law applies over much of the 

 range tested, but some discrepancies occurred. The dis- 

 crepancies may be associated with the formation of 

 multiple crests from an initially single wave as the 

 wave moves into shoal water. 



NO. 104 - February 1958 



I-A "The Mechanics of the Motion of Discrete Spherical Bottmn 

 C Sediment Particles Due to Shoaling Waves" by P. S. Eagleson, 

 R. G. Dean and L. A. Peralta 



Laboratory investigation in extension of that reported 

 in Technical Memorandum No. 63 is continued into 

 mechanics of processes by which beach sediments are 

 sorted selectively when acted upon by shoaling waves. 

 Incipient and net motions of discrete spherical sedi- 

 ment particles of different diameter and specific 

 gravity were studied statistically on smooth and roughened 

 surfaces of different slope under several conditions of 

 equivalent deep water wave steepness. Theoretical analysis 



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