BEACH EROSION LITERATURE 



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

 library which are considered to be of general interesto Copies '^f 

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

 official agencies o 



"The Distortion of Scales in Models with Loose Beds," Herbert Chatley, 

 Report on Second Meeting of International Association for Hydraulic 

 Structures Research, Stockholm, 7-9 June 19^8, pp, 107-111= 



An examination of the distortion of scales in models is 

 nadeand discussed for conditions in regime channels in incoherent 

 alluvium, in empirical rules for flow in alluvial channels, in 

 models fed by natural rainfall, and in tidal models. The author 

 states that investigators frequently express opinions that 

 distortion should be less than a certain value; however, he con- 

 cludes that, (1) a distortion may be as high as two times the 

 square root of the vertical model scale if side slopes in the 

 model are steep, (2) a distortion equal to the square root of 

 the vertical scale is of fen applicable, and (3) values of dis- 

 tortion as high as 100 are not compatible with true similarity, 



"The Formation and Movement of Sand fers hy Wave Action," Co Ao Mo 

 King and Yio 'Wo Williams, Geographical Journal, Volo 113, June 1949 

 ppo 69-85. 



Tbiis interesting paper describes studies on the formation 

 and movement of tv.'o types of natural sand bars, the submarine bars 

 of a tideless sea and the ridge and runnel beaches of tidal seaso 

 Model wave tank experiments showing the effect of wave height and 

 period, beach gradient, vave steepness, and onshore winds; on 

 sand movement, break-point bar formation, and swash bar formation 

 are discussed and illustrated o The correlation of tank experi- 

 ments and field observations are described for bars in tideless 

 seas, and ridge and runnel beaches o The authors conclude that 

 one important question is unanswered; namely the exact mode of 

 sand movement under surf waves because of the difficulty in 

 simulating surf conditions in wave tanks, and observations are 

 difficult to make in nature o They suggest that the solution may 

 be found only in a larger laboratory tanko 



"The :tehavior of Vfaves on Tidal Streams," No Fo &rber. Proceedings 

 of the Royal Society, Series A, Volo 198, NOo 1052, 22 July 194-9, 

 ppo 81-93. 



The paper reports on the changes in wave characteristics 

 which take place when the waves encounter regions where the 

 Tirater has a streaming motion „ Mathematical treatment applied 



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