T.M. No. 101 - October 1957 



Dune Formation and Stabilization by Vegetation and Plantings 

 by John H. Davis 



A discussion of the effectiveness of various plants In dune 

 formation and stabilization is presented. Methods for establishing 

 plantings are Included. Also included are performance records of 

 several dune vegetation Installations In various parts of the country. 

 A tabulation of plants which are numerically Important toward dune 

 stabilization In the United States and their frequency of occurrence 

 for various parts of the United States coast is appended. 



T.M. No. 102 - October 1957 



A Method for Specification of Sand for Beach Fills by 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 require- 

 ments, or which, after consideration of comparative costs of material 

 from alternative sources, wil I 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. 



T.M. No. 105 - December 1957 



Model Study of Wave Refraction by R. L. Wiegel and A. L. Arnold 



Tests were made In a laboratory wave tank to verify applicabil- 

 ity of Snel I 's Law in water wave refraction. Results Indicate Snel I 's 

 Law applies over much of the range tested, but some discrepancies 

 occurred. The discrepancies may be associated with the formation of 

 multiple crests from an Initially single wave as the wave moves Into 

 shoal water. 



T.M. No. 104 - February 1958 



The Mechanics of the Motion of Discrete Spherical Bottom 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 

 T. M. 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 sed iment part ides 

 of different diameter and specific gravity were studied statistically 



30 



