BULKHEAD - A structure or partition to retain or prevent sliding of the 

 land. A secondary purpose is to protect the upland against damage 

 from wave action. 



BUOY MOORING SYSTEM - A method of anchoring a buoy or of fastening 

 instruments to the anchor lines of a buoy. 



BUOY, INSTRUMENTED - A buoy equipped with oceanographic instruments. | 



CATHODIC PROTECTION - Prevention of the corrosion or fouling of steel 

 structures by electrical means. 



CHANNEL BARRIER - A structure restricting tidal flow to permit energy 

 production, storm protection, navigation, or water quality control. 



CHANNEL PROTECTION - Control of siltation in harbors and navigation 

 channels by means of structures or stationary dredging plants. 



COATING - A protective paint, film, or covering or a method of application. 



COFFERDAM - A temporary barrier allowing repair or construction of coastal 

 structures under dry conditions. 



COLLISION PROTECTION - Prevention of direct impact between ships and 

 cdastal structures. 



CONCRETE ARMOR UNIT - A concrete object usually shaped to interlock, used 

 in a protective outer layer on a coastal structure. 



CONCRETE BLOCK - A concrete block used for coastal structures, usually 

 a form of paving block used in revetments or of structural block 

 used in seawalls. 



CONCRETE FORM - A stationary or movable mold for concrete or grout. 



CORROSION MEASUREMENT - Measurement of corrosion for research or control 

 of cathodic protection systems. 



CORROSION PREVENTION - Protection of metal coastal structures against 

 corrosion damage. 



CURRENT MEASUREMENT - Measurement of ocean or tidal current velocity or 

 dirf»ction. 



DEPTH PRESSURE MEASUREMENT - Determination of depth by measuring water 

 pressure, usually to measure wave or tidal height or to control the 

 depth of towed bodies. 



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