KNOLL. A submerged elevation of rounded shape rising less than 1000 meters 

 from the ocean floor and of limited extent across the summit. Compare 

 SEAMOUNT. 



KNOT. The unit of speed used in navigation equal to 1 nautical mile 

 (6,076.115 feet or 1,852 meters) per hour. 



LAGGING. See TIDES, DAILY RETARDATION OF. 



LAGOON. A shallow body of water, like a pond or lake, usually connected to 

 the sea. (See Figures A-8 and A-9.) 



LAND BREEZE. A light wind blowing from the land to the sea, caused by unequal 

 cooling of land and water masses. 



LAND-SEA BREEZE. The combination of a land breeze and a sea breeze as a 

 diurnal phenomenon. 



LANDLOCKED. Enclosed, or nearly enclosed, by land — thus protected from the 

 sea, as a bay or a harbor. 



LANDMARK. A conspicuous object, natural or artificial, located near or on 

 land, which aids in fixing the position of an observer. 



LEAD LINE. A line, wire, or cord used in sounding. It is weighted at one end 

 with a plummet (sounding lead). Also SOUNDING LINE. 



LEE. (1) Shelter, or the part or side sheltered or turned away from the wind 

 or waves. (2) (Chiefly nautical) The quarter or region toward which the 

 wind blows. 



LEEWARD. The direction toward which the wind is blowing; the direction toward 

 which waves are traveling. 



LENGTH OF WAVE. The horizontal distance between similar points on two 

 successive waves measured perpendicularly to the crest. (See Figure A-3.) 



LEVEE. A dike or embankment to protect land from inundation. 



LIMIT OF BACKRUSH (LIMIT OF BACKWASH). See BACKRUSH, BACKWASH. 



LITTORAL. Of or pertaining to a shore, especially of the sea. 



LITTORAL CURRENT. See CURRENT, LITTORAL. 



LITTORAL DEPOSITS. Deposits of littoral drift. 



LITTORAL DRIFT. The sedimentary material moved in the littoral zone under the 

 influence of waves and currents. 



LITTORAL TRANSPORT. The movement of littoral drift in the littoral zone by 

 waves and currents. Includes movement parallel (longshore transport) and 

 perpendicular (on-offshore transport) to the shore. 



A-19 



