The continued fill in New Valley supports the contention that the area 

 may have become stabilized so that this valley may be completely filled 

 returning to the conditions in 19^9 when no valley existed in that 

 vicinity. 



IV. Massachusetts Institute of Technology, Contract No. DA-U9-055-eng-l6 , 



Additional data were gathered on the mean (sand) particle velocity 

 along the beach and its relation to the wave and depth characteristicsj 

 and on the location of the null point (point separating the areas of 

 onshore and offshore movement) and its relation to wave characteristics. 

 The data tend to indicate a sudden reduction in drag force at one point 

 which may be explained by a laminar- turbulent boundary layer transition 

 on the sphere — the break occurring at Reynold 1 s numbers of the same 

 order as those determined by Li. 



V. Waterways Experiment Station, Vicksburg, Mississippi 



Wave Run-up Study; Tests with the 1 on 3 smooth slope were com- 

 pleted. 



Effect of Inlets on Adjacent Beaches: About ll|0 tidal cy.cles have 

 been run under the new test set-up (the same as the previous set up, 

 except for a shallow lagoon rather than a deep lagoon) . The reaction 

 appears to be very nearly identical to the first test, although result- 

 ing in a slightly wider and shallower channel, except for the time 

 involved - things happening only about one-half as fast as in the first 

 test. 



VI. Beach Erosion Board, Research Division, Project Status Report for 

 Quarter ending 1$ September 195^. 



In addition to the research projects under contract to various 

 institutions which are reported on above, the Research Division of the 

 Beach Erosion Board is carrying out certain projects with its own 

 facilities. The main unclassified projects have been described in 

 previous numbers of the Bulletin, and a short description of some of 

 the work accomplished through the last quarter is given below. 



Study of Effect of Tsunamis ; The study was completed, and is to 

 be published as a Technical Memorandum, showing the relation between wave 

 height at the shore line and wave height in deeper water as a function 

 of steepness, and between these variables and wave run-up on idealized 

 shore structures. Actually the ratio of run-up to wave height at the 

 shore line appears to approximate a constant value. 



Groin Study ; Difficulties in adequately trapping and measuring 

 the sand transport (estimated to be on the order of 800-900 pounds per 

 hour ) without disturbing the wave pattern adjacent to the trapping 

 area appear to be essentially overcome, and acutal testing should start 

 in the next quarter. 



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