Volume 5, No. I (Continued) 



Generalization of the Formula for Calculation of Rock Fill Dikes 

 and Verification of its Coefficients 



Translations from a Spanish article-by Ramon Iribarren Cavanilles. 

 The author's formula for determining stable rock size presented in an 

 earlier Bulletin article (Volume 3, No. I) is discussed, and certain 

 modifications and generalizations are introduced bearing on evalua- 

 tion of the constant term based on 12 years of experience following 

 the original formula. 



Application of Asphalt in Hydraulic Engineering Works 



A translation of a Dutch paper by J . H. van der Burgt describing 

 the use of asphalt in hydraulic works in the Netherlands. General 

 standards and uses for asphalt are discussed, and detailed descrip- 

 tion (with photographs) of actual coastal projects are presented. 



Volume 5, No. 2 - Apr i I 1951 



Limiting Batter (Slope) Between the Breaking and Reflection 



A formula previously presented by Ramon Iribarren Cavanilles and 

 Castro Nogales y Olano, expressing the limiting slope of a structure 

 in terms of incident wave characteristics where slopes flatter than 

 the limiting slope result in breaking waves and steeper slopes result 

 in reflected waves, is discussed and re-examined in light of further 

 experimental work by other investigators. The limiting slope given 

 by the formula is verified to be the mean s lope- between that re- 

 sulting in total breaking and that resulting in total reflection. 



Wave Diffraction for Oblique Incidence 



Translation from the French language of an article by Henri 

 Lacombe appearing in December 1950 Information Bulletin of the Comite 

 Central d'Oceanograph ie et d'Etude des Cotes. Theoretical solution 

 of this problem is discussed in relation to simplified solution by 

 others. A bibliography is included. 



Observations Made on Karentes Beach 



Translation of a technical note by Professor W. W. Williams and 

 C. A. M. King, Cambridge University, which appeared in the Informa- 

 tion Bulletin of the Comite Central d 'Oceanographie et d'Etude des 

 Cotes in December 1950. Bar formations were studied in detail from 

 surveys made over a 3-year period on a beach area subject to a small 

 tidal range (less than 1/2 foot). The area is west of Sete on the 

 south coast of France. 



53 



