Protective beach-Continued 



borrow material selection 5-9, 6-16, 6-17, 8-129, 



8-130,8-131 



critical ratio 5-10,6-17 



erosion 6-59, 6-61, 6-63 



Continued 



Protective beach— Continued 



feeder beach location 5-20 



groins (artificial filling) 5-7 



restoration examples 6-16 



Protection of beaches (see Beach protection) 



--0-- 



Quadripod (precast armor unit) 6-85, 7-170, 7-182, Quarrystone (weights and dimensions) 7-198 



7-183, 7-186, 7-192, 7-196 Quay A-27 



--R-- 



Racine County, Wisconsin 4-90 



Radioiosotope tracing 4-151 



Radioisotopic Sand Tracing (RIST) 4-223 



Rayleigli distribution 3-5, 4-30 



Redondo Beach (Malaga Cove), California . . . 4-90, 5-29, 



6-16, 6-32, 6-34, 6-35 



Reefs (organic) 4-21 



Reflection (wave) (see Wave reflection) 



Reflection coefficient 2-110, 7-127 



Refraction (wave) (see Wave refraction) 



Refraction coefficient 2-67, 2-70, 8-41, A-28 



Refraction template 2-68 



Relative depth 2-9 



Resonant waves 2-115 



Revetment 1-16, 5-3, 6-1, A-29 



channel (design) 7-203 



flexible 6-6, 6-11, 6-12, 6-13 



purpose 5-3, 5-5, 6-1 



rigid 6-6, 6-10 



types 6-6 



Reynolds Number 4-15, 7-96, 7-99, 7-176 



Ridge- and-runnel system 4-75 



Rigid structure 7-2 



Rincon Beach, California 4-10 



Rincon Island, CaUfornia 7-192 



Rip currents 1-9, 4-5, 4-45, 4-46, A-30 



Ripple A-30 



RIST 4-223 



Rock (in httoral zone) 4-21 



Rubble foundations 7-201, 7-203 



design wave 7-2, 7-201 



stability 7-201 



wave forces 7-142, 7-152 



Sabellarid worms 4-22 



Sainflou Method (nonbreaking wave forces) 7-127 



Salina Cruz, Mexico 6-54 



Saltation (see also Sand movement (wind)) A-31 



Sampling sediment 4-24 



Sand (see also Littoral materials) 



borrow areas 6-16 



composition 4-18, 4-20 



conservation 1-21 



heavy minerals 4-19 



impoundment . .1-16, 4-5, 5-24, 5-26, 5-27, 5-30, 5-32, 



5-48, 5-50, 6-36, 646, 6-51, 6-54 



normal size distribution 4-15 



origin 1-5, 4-119 



sinks 4-117, 4-124 



size classification (see Soil classification) 



Rubble-Mound structures . . . 5-4, 6-83, 6-84, 6-89, 6-96, 



7-167, 8-66 



armor units (see also Precast concrete armor units) 



7-169 



breakwater 5-49, 5-50 



cross-section example (see also Breakwater) . . . 6-97 



concrete armor units 7-180 



concrete cap 7-196 



cross-section example 6-97, 7-191, 7-193, 8-66 



design 7-182, 7-194, 7-195 



core volume 8-78, 8-83 



crest width 7-196 



economic evaluation 7-1, 8-63, 8-83, 8-85, 8-91 



layer thicknesses 7-197, 8-76 



layer volumes 8-69, 8-78, 8-79, 8-81 



number of armor units 7-197, 8-76 



weight of armor units . . . 7-169, 7-202, 7-203, 8-67, 



8J68 



design wave 7-2, 7-177, 7-201 



filter blanket 7-200 



groin 5-31, 6-83 



permeability 6-83 



jetties 5-46, 6-84 



runup 7-24 



scour 5-5 



stability 7-167, 7-201 



uses 5-46, 5-49, 5-50, 6-83, 6-84, 6-89, 6-96 



Rubble toe protection 



stability of 7-201 



Rudee Inlet (Virginia Beach), Virginia 6-54 



Runup (wave) 7-15, A-30 



composite slopes 7-33 



scale effects 7-17, 7-23 



S-- 



Sand— Continued 



size distribution, coastal 4-22, 4-23, 4-24 



unit weight 4-19 



Sand bypassing . . 1-16, 1-17, 5-21, 5-24, 5-28, 5-51, 6-54 



fixed bypassing plant 5-27, 6-54 



Lake Worth Inlet, Florida 6-56 



South Lake Worth Inlet, Florida 6-56 



floating bypass plant 5-28, 6-54, 6-59 



Channel Islands Harbor, California 6-61 



Hillsboro Inlet, Florida 6-65 



Masonboro Inlet, North Carolina 6-65 



Perdido Pass, Alabama 6-65 



Port Hueneme, California 6-59 



Santa Barbara, California 6-63 



land-based vehicles 5-30, 6-54, 6-76 



Shark River Inlet, New Jersey 6-76 



D-9 



