SAMPLER, POWER SUPPLY - A source of thrust for samplers such as driven 

 or drilled corers, including explosives, vibratory devices, or implo- 

 sive hydrostatic pressure chambers. 



SAMPLER, SEABED-DRILLED CORE - Drilling apparatus taking sediment core 

 samples from the seabed, usually coring bits with retainers for soft 

 or granular material. 



SAMPLER, SEABED-DRIVEN CORE - A means for taking sediment core samples 

 from the seabed by thrusting a coring tube or box into the bed, 

 using a propulsive device or the kinetic energy of a free fall to 

 drive the corer. 



SAMPLER, SEABED GRAB - A means of taking a disturbed surface saiiq>le 

 from the seabed. 



SAMPLER, SURFACE - A means for sampling matter, usually pollution or 

 biota, floating on or near the water's surface. 



SAMPLER, SUSPENDED SEDIMENT - A means for capturing samples of sediment 

 suspended in or falling through water. 



SAMPLER, WATER - A container taking a water sample at a preselected depth. 



SANDBAG - A bag or tube of fabric or plastic film filled with sand, grout, 

 or concrete to seal, underpin, or serve as a structural unit in a 

 coastal structure. 



SAND FENCE - A barrier for trapping windblown sand to prevent erosion 

 and promote formation of dunes. 



SEABED CABLE PLOW - A plow-shaped device for burying cable or flexible 

 pipe in the seabed without excavating a trench. 



SEABED FOUNDATION - A structure on or in the seabed for supporting a 



superstructure, such as oil- or water-process equipment, an offshore 

 platform, a storage tank, or a breakwater. 



SEABED GRADER - A remote-controlled submersible bulldozer or similar 

 equipment for leveling a seabed site. 



SEABED MATERIAL PLACEMENT - Placement of materials such as concrete, 

 asphalt, sand, gravel, grout, or turbidity-reducing agents on the 

 seabed as a layer or in a form. 



SEABED OIL, PROCESS STRUCTURE - A structure fixed to the seabed for 



supporting or protecting submerged drilling, completion, or produc- 

 tion equipment such as wellheads or gas-separation units. 



SEABED PIPELINE PLACEMENT - Anchoring or burying a pipeline in the sea- 

 bed, excluding methods for laying the pipeline itself from barges. 



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