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, 



"Echo Sounding through Ice," Lt„ Comdr. Jo To Jarman and Lt„ D„ M. ^Tiipp, 

 Journal, Coast and Geodetic Survey, No. 2, April 1Q4-9.. 



This article reports the results of experiments in echo sounding 

 through ice conducted during Feb. -March, 194-8, at Devils Lake and 

 Buffalo Lake, Fashington. The authors conclude that; (1) the experi- 

 ments have demonstrated that with present portable depth recorder 

 projectors and receiver units soundings can be successfully obtained 

 to a depth of 80 feet when the equipment is stationary, but they are 

 not sensitive enough to be used successfully when moving across the 

 ice surface; (2) the greatest obstacle to overcome with moving equip- 

 ment is the establishment of a proper bond between the units and the 

 ice; (3) there is some indication that the double echoes recorded 

 could possibly furnish a measurement of the ice thickness. 



"Mean Sea Level - A Basic Engineering Datum," Capt. C. Do Meaney, Journal, 

 Coast and Geodetic Survey, No. 2, April 1949 . 



Mean sea level is the basic datum for elevations and must be carefully 

 distinguished from half- tide level or mean tide level. A discussion 

 of the daily, monthly, and yearly sea level variations is presented. 

 Charts indicating monthly and yearly variations are shown for several 

 points on the Atlantic and Pacific coasts. A method of the determina- 

 tion of mean sea level from a continuous series of observations over 

 a fixed number of years and during a given epoch is analyzed 



"Tidal Power and the Severn Barrage," H. Headland, Proc. Inst. Electrical 

 Engineers, Vol. 96, Part II, No. 51 , June 194-9. (With discussion) 



A review of the principal projected tidal-power schemes in various 

 parts of the world is presented. The paper gives consideration to 

 the principles of single- and double-tide working and their applica- 

 tion under the conditions prevailing in the Severn Estuary. The 

 engineering features of the project are described and economic 

 considerations are discussed. The author concludes that the future 

 possibilities for tidal-power development are not unfavorable, and 

 further investigation of economic factors, constructional methods 

 and plant design are justified. 



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