(i) Recorded Wave Characteristics 



Routine compilations of recorded wave characteristics at Huntington 

 Beach, California; Atlantic City, New Jersey; Naples, Florida; Palm Beach, 

 Florida; and Port Hueneme, California have been continued. 



(j) Re-examination of Beach Protection Projects 



A continuing program is being carried out on the re-examination of 

 artificially nourished beaches to determine the eff ectivemess of the 

 fill material within the beach zones, and to better establish the factors 

 upon which the design characteristics of fill material are based. Studies 

 presently underway include Virginia Beach, Virginia; Plum Island, Mass- 

 chusetts; Presque Isle, Pennsylvania; Harrison County, Mississippi; and 

 El Segundo and Newport Beach, California. A continuing examination of 

 the asphalt groins at Ocean City, Maryland has been made and a preliminary 

 report prepared. Study of other asphalt groins is also being made. 



(k) Technical Report No. 4, "Shore Protection Planning and Design" 



A continuing study is being made to improve and supplement present 

 chapters of this publication. General corrections and addenda were pub- 

 lished and disseminated during the year. 



(1) Regional Studies 



Data on the georaorphology and characteristics of littoral materials 

 are now being compiled for the south shore of Long Island, and the shore 

 sector between Cape Henlopen, Delaware to Cape 'charles, Virginia. 



(m) Rubble Mound Stability 



Large scale tests are being carried out on rubble mound stability 

 to spot check results of many smaller scale tests made at the Waterways 

 Experiment Station. Tests at the Board will involve stone of roughly 

 150-pound weight on slopes of 1 on 1-1/2 and 1 on 2-1/2. The first test 

 breakwater has now been installed, and testing should be initiated in the 

 near future. 



(n) Development of In-Place Sediment Density Gage 



An in-place sediment density gage has been developed utilizing a 

 radioactive source in the probe. Laboratory tests of this gage in espe- 

 cially prepared mud and chemical mixtures have been made, enabling a 

 calibration of the gage. One field test was carried out in the Savjinnah 

 River in cooperation with the Savannah District of the Corps of Engineers. 

 This test was handicapped by flood stages in the river, but indicated a 

 satisfactory usage of the gage. A report describing the gage and its 

 potentialities is underway. 



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