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

 uprush . 



TENSILE STRENGTH - The strength shown by a material subjected to tension as 

 distinct from torsion, compression or shear. 



TERRESTRIAL - Of or relating to the earth and' its inhabitants as opposed 

 to aquatic. 



THIXOTROPIC - Becomes fluid when shaken, stirred, or otherwise disturbed and 

 sets again to a gel when allowed to stand. 



TOE - The lower elevation terminus of a revetment or side slopes of a groin, 

 breakwater or jetty. The outer limit of a scour protection mound. 



TREMIE - An apparatus for depositing and consolidating concrete under water 

 consisting essentially of a tube of wood or sheet metal with a top in the 

 form of a hopper. 



TSUNAMI - A long-period wave caused by an underwater disturbance such as 

 a volcanic eruption or earthquake. Commonly miscalled "tidal wave." 



TURBIDITY - A condition where transparency of water is reduced. It is an 

 optical phenomenon and does not necessarily have a direct linear relation- 

 ship to particulate concentration. 



ULTRAVIOLET (UV) RESISTANCE - Ability to resist deterioration on exposure 

 to sunlight. 



VERTICAL SEAWALL - See Bulkhead. 



VISCOSITY - (or internal friction) - That molecular property of a fluid that 

 enables it to support tangential stresses for a finite time and thus to 

 resist deformation. 



WARP - Fibers or yarns lengthwise in the fabric. 



WEB - The sheet or mat of fibers or filaments before bonding or needle- 

 punching to form a nonwoven fabric. 



WHARF - A structure built on the shore of a harbor, river, or canal, so 

 that vessels may lie alongside to receive and discharge cargo and 

 passengers. 



WOVEN FABRIC - A textile structure comprising two or more sets of filaments 

 or yarns interlaced in such a way that the elements pass each other 

 essentially at right angles and one set of elements is parallel to the 

 fabric axis. Usually has a uniform pattern with distinct and measurable 

 openings. Commonly referred to as cloth. 



YARN - A generic term for a continuous strand of textile fibers, filaments 

 or materials in a form suitable for weaving or otherwise intertwining to 

 form a textile fabric. 



GPO 698-901 



427 



