STEEM r (l) ^ ccUrse of water flowing along a bed in the earth; (2) A 



current in the sea formed by wind action, water density differences j 

 etc. (auir Stream) See also CURRENT. STREM. 



SURF '- The wave activity intht area between the shore line and the outer- 



most limit of breakers, 



SURF SEAT - Irregular oscillations of the nearshors water level, with 

 periods of the order of several minutes, 



SURF ZONE - The area between the outermost breaker and the limit of wave 

 uprushe ("^ee Figures A-2 and A-5) » * 



SURGE - (l) The name applied to wave motion with a period intermediate 



between that of the ordinary wind wave and that of the tide^ say from ^ 

 to 60 minutes. It is of low height| usually less than 0,3 foot. 

 See also SEICHE. (2) In fluid flow, long interval variations in 

 velocity and pressure^ not necessarily periodic^ perhaps even 

 transient in nature, 



SURGING BREAJiEii - See under Breaker, 



SWA14P (noun) - A tract of wet spongy land, frequently inundated by fresh 

 or salt water, and characteristically dominated by trees ai*i shrubs, 



SWAIff (verb) - To overset, sink^ or fill up a craft with wat^r, 



SWASH - The rush of x-iater up onto the beach following the breaking of a 



wave. Also UFRUSH, RUN-UP, 



SWASH CHANNEL - (l) On the open shore,, a channel cut by flowing water in 

 its return to the parent body Ce,g, a rip channel )| (2) A.secondar^^ 

 channel passing through or shoreward of an inlet or river bar, 

 (See Figure A-9), 



avASH J'lARK " The thin way}'- line of fine sand, mica scaleSo bits of seaweed, 

 etc, left by the uprush when it recedes from its upward li.nit of 

 movement on the beach face, 



Si'ffiLI. - Wind-generated waves that have advanced into regions of weaker 

 winds or calm, 



TERRACE - A horizontal or nearly horizontal natural or artificial topo- 

 graphic feature interrupting a steeper slope j sometimes occurring 

 in a series, 



TIDAL CURRENT - A current caused by the tide -producing forces of the 



moon and the sun^ a pai't of the same general movement of the sea that 

 is manifested in the vertical rise and fall of the tides. Also 

 CURRENT^ PERIODIC See also GURREwT, FLOOD and flURRENT^ EBBo 



A-3U 



