CONSTRUCTION OF ADDITIONAL BEACH EROSION 

 BOARD RESEARCH FACILITIES 



The Beach Erosion Board research facilities are being expanded by the 

 construction of a large wave ta'nk and a coast model test basin „ Plans and 

 specifications for the tanks were prepared in conjunction with the District 

 Engineer, Corps of Sigineers, Washington, D„ Go and the construction is 

 being performed under the general supervision of the District Engineer „ 

 The contractor is Blackwell Engineering Company, Warren ton, Virginia „ The 

 work is to be completed in 270 calendar days for a total contract cost of 

 $354j}958 o This contract is about 25 per cent complete at the time this 

 publication goes to press „ 



Wave Tank 



The wave tank will be 635 feet long, 15 feet wide, and 20 feet deep„ 

 Generation of waves is to be accomplished by a pusher-type wave generator 

 capable of producing a maximum wave 6 feet in height and 300 feet in 

 length, in a normal water depth of 15 feet„ The tank will be built of 

 reinforced concrete with the top of the tank 4 feet above the finished 

 grade o A working platform traveling longitudinally on rails, anchored to 

 top of the tank wall will provide access and measurement facilities during 

 the experiments o Three stop-log slots will be built in the walls to 

 allow partition of the tank into variable lengths and reduce water re- 

 quirements o The tank will be used for the study of ttie design of upstream 

 slope protection for earth dams, ssa walls, breakwaters, other harbor pro- 

 tective structures, and other structures subject to wave action „ 



The design of the large wave tank presented numerous problems which 

 were studied in a 1;12 scale model in the Board's laboratory to assist 

 in the actual design of the tank 



Coast Model Tes t Basin 



The basin will be 300 feet by 150 feet in plan and 3 feet deep G 

 Reinforced concrete construction is to be used throughout the basin 

 structure with the 3 feet perimeter wall extending above finished grade,, 

 A test area of about 200 feet by 100 feet, with a water depth of 2 feet 

 in the offshore, will be utilized in conducting tests „ Wave generators 

 will produce a maximum wave in the magnitude of 2/3 feet in height in the 

 2=foot water depth „ In order to provide flexibility in the location and 

 arrangement of the wave generating equipment, the equipment will be con- 

 structed in several units „ The type of wave generator to be utilized in 

 the coast model basin is being investigated by small scale model studies „ 

 In conjunction with the basin a storage reservoir 4-0 feet square and 11 

 feet deep will be constructed to function as a sump, with pump facilities, 

 for simulating tides „ Two pumps, one <4 S 500 gpm and the other 2,200 gpm, 

 will provide for water circulation to the basin „ 



The basin will be used to study methods of controlling inlets to 

 prevent damage to adjacent shores $ means of reducing wave and current 



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