JETTY - (l) (p. So usage) On open seacoasts, a structure extending into 

 a body of water, and designed to prevent shoaling of a channel by- 

 littoral materials, and to direct and confine the stream or tidal 

 flowo Jetties are built at the mouth of a river or tidal inlet 

 to help deepen and stabilize a channel, (2) (British usage) 

 Jetty is synonymous with "wharf" or "pier", 



KELP - The general name for several species of large seaweeds. A mass 

 or growth of large seaweed or any of various large brown seaweeds, 



KEY - A low insular bank of sand, coral, etc,, as one of the islets off 

 the southern coast of Florida, Also CAY, 



KINETIC MERGY (OF WAVES) - In a progressive oscillatory wave, a 



summation of the energy of motion of the particles within the wave. 

 This energy does not advance with the wave form, 



KNOLL - (l) A submerged elevation of rounded shape rising from the ocean 

 floor, but less prominent than a searaount. (2) A small rounded hill, 



KNOT - (Abbreviation kt,, or kts.) The unit of speed used in navigation. 

 It is equal to 1 nautical mile (6, 080.20 feet) per hour. 



LAGGING - See DAILY RETARDATION (OF TIDES) 



LAGOON - A shallow body of water, as a pond or lake, which Uvsually has a 

 shallow, restricted outlet to the sea. (See Figures A-8 and A-9). 



LAND BREEZE - A light wind blowing from the land 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 - An area of water enclosed, or nearly enclosed, by land, as 

 a bay, a harbor, etc, (thus, protected from the sea), 



LAND1*4ARK - A conspicuous object - natural or artificial - located near 

 or on land which aids in fixing the position of an observer, 



LEADLINE - A line, wire, or cord used in sounding. It is weighted at one 

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



LEE - (l) 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 travelling. 



A-17 



