BEACH EROSION LITERATURE 



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

 library which are considered to be of general interest. Copies of 

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

 official agencies,, 



"Observations of Echo Signals Obtained Using Variable Frequency Trans- 

 mis sion s " Edwin Mo itfc Milan, July 4, 1942. 



In dealing with the problem of large amplitude fluctuations 

 in underwater echoes, the frequency modulation offers very 

 considerable improvement in the distinguishability of echoes 

 from reverberation i for listening, the signal frequency sweep 

 is preferable because of the ability of the ear to differentiate 

 a tone, or sequence of tones, from a toneless background and 

 for presentation on a cathode ray screen, rapid modulation by 

 a sine wave or by noise is preferable because it gives more 

 effective smoothing of the reverberation. 



"Model Study of Sand Transport Along an Infinitely Long, Straight, 

 Beach,** Thorndike Saville, Jr., Trans. AGU, Vol. 31, No. 4, 1950 



This paper describes a small-scale tank study of the rate 

 littoral transport of sand Induced by wave action on a straight 

 beach inclined to the direction of wave crest. 



"Notes on the Studies of Dam Problems Carried Out in the Laboratorio 

 de Engenharia Civil," Lisbon, 1950. 



The Laboratorio de Engenharia has made numerous studies of 

 problems related to the building of large dams. This paper 

 discusses studies of materials, cements, concretes and soils 

 together with studies of mechanical properties of the founda- 

 tion rock and observations of the dams during and after con- 

 strue t ion . 



"Report of Sedimentation Surveys, Denison Dam (Lake Texoma) Red 

 River, Texas and Oklahoma, 1 * June 1950, Tulsa District. 



This report presents the results of the first re survey 

 of sedimentation in Lake Texoma. Data relative to changes in 

 the river below the dam are also presented. The purpose of 

 the investigation was to determine the effect of the operation 

 of the project upon the channel of the Red River downstream 

 from the dam. 



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