are recorded at several points in the channel and also in the lagoon. 
Some small amount of tidal current data has also been obtained. 
(J) Experimental Studies, Effectiveness of Sand Fences. 
In cooperation with the State of North Carolina and the Wilmington 
District of the Corps of Engineers, a study has been underway on Core 
Bank, a part of the Outer Banks of North Carolina, on the effectiveness 
of various types of sand fence in building and stabilizing dunes. The 
portable wind station in the fence area has been operating more or less 
continuously, and has recorded wind data through two hurricanes. The 
drive system for the recorder has been converted from a spring-would 
system to an electric motor powered by a gas thermo-couple generator; a 
battery system has also been installed as standby in case the gas gene- 
rator stops operating. Installation of tide gages on both the sound and 
sea side of the Banks has been considered, but not yet carried out. With 
the filling of the first fences installed, an additional 2,000 feet of 
fence was installed to give further information on the rate of dune growth, 
and the effectiveness of various types of fencing. This fencing was in- 
stalled on top of the dune generated by the earlier fences. Roughly half 
of this new fencing was destroyed during a heavy storm in the spring of 
1963, but this has since been replaced. Periodic profiles were again 
taken of the accumulation area of the fences to indicate effectiveness of 
the various types. A report "Experimental Study of Dune Building with 
Sand Fences" by R. P. Savage was published in the Proceedings of the 8th 
Conference on Coastal Engineering, Council on Wave Research, Engineering 
Foundation (1963). 
(K) Study of Proposed Los Angeles-Santa Monica Causeway. 
Several proposals have been made to the State of California for con- 
struction of an offshore causeway across a portion of Santa Monica Bay. 
One of these proposals involves an offshore sand barrier which would 
serve not only as a causeway, but also provide a large recreational beach 
frontage on the ocean side, and a large area of marina facilities on the 
shore side, One of the proposals for such a sand barrier also involves a 
submerged rock barrier seaward of the sand barrier itself -.to hold the sea- 
ward end of the barrier, The rock barrier would be submerged to perhaps 
15 feet to prevent damage to swimmers and small craft. This rock barrier 
thus would eliminate the large quantity of sand otherwise necessary to 
form the toe of the sand barrier. This perched beach type of construction 
is virtually unknown, and an abbreviated set of model tests was carried 
out to give an indication of the effect of the submerged rock barrier in 
inducing scour adjacent to and landward of it, and also some indication 
of the proportion of the scoured material which might be expected to move 
seaward across the barrier and thus be lost to the shore regime. The 
model was to a 1 to 2 scale, and it involved waves of 3 to 6-foot model 
height. The test series was quite abbreviated, and a much fuller set of 
data would be desirable should such a proposal ever reach design stage. 
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