LITTORAL TRANSPORT RATE. Rate of transport of sedimentary material parallel 

 or perpendicular to the shore in the littoral zone. Usually expressed in 

 cubic meters (cubic yards) per year. Commonly synonymous with LONGSHORE 

 TRANSPORT RATE. 



LITTORAL ZONE. In beach terminology, an indefinite zone extending seaward 

 from the shoreline to just beyond the breaker zone. 



LOAD. The quantity of sediment transported by a current. It includes the 

 suspended load of small particles and the bedload of large particles that 

 move along the bottom. 



LONGSHORE. Parallel to and near the shoreline; ALONGSHORE. 



LONGSHORE BAR. A bar running roughly parallel to the shoreline. 



LONGSHORE CURRENT. See CURRENT, LONGSHORE. 



LONGSHORE TRANSPORT RATE. Rate of transport of sedimentary material parallel 

 to the shore. Usually expressed in cubic meters (cubic yards) per year. 

 Commonly synonymous with LITTORAL TRANSPORT RATE. 



LOOP. That part of a STANDING WAVE where the vertical motion is greatest and 

 the horizontal velocities are least. Loops (sometimes called ANTINODES) 

 are associated with CLAPOTIS and with SEICHE action resulting from wave 

 reflections. Compare NODE. 



LOW TIDE (LOW WATER, LW) . The minimum elevation reached by each falling 

 tide. See TIDE. (See Figure A-10.) 



LOW WATER DATUM. An approximation to the plane of mean low water that has 

 been adopted as a standard reference plane. See also DATUM, PLANE and 

 CHART DATUM. 



LOW WATER LINE. The intersection of any standard low tide datum plane with 

 the shore. 



LOW WATER OF ORDINARY SPRING TIDES (LWOST). A tidal datum appearing in some 

 British publications, based on low water of ordinary spring tides. 



LOWER HIGH WATER (LHW). The lower of the two high waters of any tidal day. 

 (See Figure A-10.) 



LOWER LOW WATER (LLW). The lower of the two low waters of any tidal day. The 

 single low water occurring daily during periods when the tide is diurnal 

 is considered to be a lower low water. (See Figure A-10.) 



MANGROVE. A tropical tree with interlacing prop roots, confined to low-lying 

 brackish areas. 



MARIGRAM. A graphic record of the rise and fall of the tide. 



MARSH. An area of soft, wet, or periodically inundated land, generally tree- 

 less and usually characterized by grasses and other low growth. 



A-20 



