Table 8
L i t t l e River I n l e t J e t t i e s
L i t t l e River I n l e t , S o u t h C a r o l i n a , SAC
Date
C o n s t r u c t i o n and R e h a b i l i t a t i o n H i s t o r y
The c o n s t r u c t i o n o f two armor s t o n e j e t t i e s a t L i t t l e River I n l e t
1984
.5 m i l l i o n . The j e t t i e s p r o v i d e improvement and s t a b i l i z a t i o n of
t h e i n l e t , w i t h t h e e n t r a n c e c h a n n e l m a i n t a i n e d a t -12 f t m l w . The
and downcoast j e t t i e s were 5,660 and
t o t a l l e n g t h s of t h e
8 , 8 1 5 f t , r e s p e c t i v e l y . Each j e t t y ( F i g u r e 1 5 ) c o n s i s t e d of a s a n d
d i k e , a s a n d - t i g h t j e t t y s e c t i o n , a 6 5 0 - f t w e i r s e c t i o n w i t h "remov-
a b l e " c o v e r s t o n e , a t r u n k s e c t i o n , and a 1 5 0 - f t head s e c t i o n . The
c o v e r s t o n e a l o n g e i t h e r w e i r s e c t i o n would b e removed i f , o v e r a
p e r i o d of s e v e r a l y e a r s , e x c e s s i v e d e p o s i t i o n of s a n d o c c u r r e d .
The j e t t y s p a c i n g a t t h e p a r a l l e l seaward e n d s w a s 1 , 0 0 0 f t . The
minimum c r e s t e l e v a t i o n of t h e s t r u c t u r e w a s 8 f t m l w ( e x c l u s i v e o f
t h e w e i r s e c t i o n ) . The head s e c t i o n s c o n s i s t e d o f a d o u b l e l a y e r of
5- t o 8 - t o n s t o n e on
s i d e s l o p e s . The t r u n k s e c t i o n s h a d
s i d e s l o p e s w i t h one l a y e r of 3.5- t o 6- ton s t o n e . D e s i g n
and t h e j e t t y c o n f i g u r a t i o n w a s
p r o c e d u r e s f o l l o w e d t h e SPM
( S e a b e r g h and Lane 1 9 7 7 ) . The d e s i g n wave
model t e s t e d a t
h e i g h t w a s 11 f t , d e t e r m i n e d from d e p t h - l i m i t i n g c r i t e r i a .
1986
A v i s u a l e x a m i n a t i o n of t h e s t r u c t u r e s i n d i c a t e d some d i s p l a c e d
s t o n e a l o n g t h e w e i r s e c t i o n of t h e n o r t h j e t t y . S u r v e y s a l s o re-
v e a l e d s c o u r h o l e s a t t h e head o f t h e n o r t h j e t t y and a l o n g t h e
c h a n n e l s i d e of t h e s o u t h j e t t y . N a p p a r e n t j e t t y damage w a s i n -
o
d i c a t e d above t h e w a t e r s u r f a c e . Damage a l o n g t h e t o e o f t h e s t r u c -
t u r e s , i f a n y , i s unknown.
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