a3) 
BEACH EROSION LITERATURE 
There are listed below some recent acquisitions of the Board's 
library which are considered to be of general interest. Copies 
of these publications can be obtained on 30 day loan by field 
offices of the Corns of Engineers and other Government agencies. 
"The Rate of Rounding of Beach Boulders," J. A. Bartrum, Journal 
Oe Ceology, Galea, Wises. Ws 559 Oo Oy ide BASS, 
November 1947. 
"A demonstration is given of the ability of waves of moderate 
strength. to round blocks of hard fine grained basalt as 
much as 2 feet in diameter in less than 10 years. Mention 
is also made of an example of the short distance of travel 
that may be involved in the rounding of stream peboles." 
"Hawatian Swell From January 2-5, 1947," R. S. Arthur, Scripps 
Institution of Oceanography Wave Report No. 72, La Jolla, 
Cal.,7p,illus., November 26, 1947. 
The report describes the 20 to 40 feet high waves which 
damaged the northern shores of the Hawaiian Islands from 
January 2~5, 1947. It demonstrates that since even such 
extreme wave conditions are entirely due to wind, they can 
be forecast using techniques already in existence. In 
this case Kahului Harbor is used as an example. 
"The Refraction of Surface Waves by Currents,'"' J. W. Johnson, 
Transactions American Geophysical Union, Washington, D. C., 
v. 28, no. 6, pp.867-874, December 1947, illus. 
It is stated that when ocean waves moving through deep still 
water, encounter a current, moving at an angle with the 
wave direction, the waves undergo a change in length, 
steepness, and direction of travel. A theoretical develop- 
ment is given for these factors in terms of initial wave 
length and direction and the magnitude of the current. The 
action of coastal currents in affording protection against 
short period waves is discussed. 
"The Formation of Beach Cusps," Ph. H. Kuenen, Journal of Geology, 
Chicago, Illinois, v. 56, no. 1, pp. 34-40, January 1948, illus. 
"In former attempts to explain the development of beach 
cusps, stress has been laid on the erosion of the beach. 
It is argued in this paper that concomitant deposition on 
the horns is at least equally important. fkefraction of the 
swash in building the cusps is emphasized, and an attempt is 
made to explain the rhythmic, roughly equidimensional nature 
of cusps." 
