Date(
Construction and Rehabilitation History
the base of the existing jetty and extended 10 ft beyond the end of
1977-
the new cover layer. The seaward end repair was identical to the
1979
(cont.) 1971-1972 work, except that
side slopes were used throughout.
Displaced cover stone was reset on the adjacent 100 ft of jetty. The
north jetty shore protection was extended 1,470 ft along the channel
shoreline; this included 150 ft of the existing shore protection
which was salvaged and rebuilt, and repairs were made to the existing
section. The design was nearly identical to that used in 1968 on the
existing shore protection. (Toe protection was 200 to 1,000
and
placed with a top width of ft.) The jetty design was based on
Hudson's equation with a maximum wave height of 26.5
(trunk) and a
ft mlt. Similar to previous improvements,
maximum surge level of
the selected jetty design was chosen for economic and practical
considerations in lieu of a
damage" design. Total cost of the
jetty repairs and shore protection was ,905,000 using approximately
140,000 tons of stone.
In August, storm waves from Hurricane Allen caused significant damage
1980
to the jetty heads and a section of the north jetty trunk had been
breached. The breached section was about
ft long and located
ft from the head.
1984
There are several places along the jetties where the foundation has
settled, resulting in the cover stone lying below
GULF SIDE
.-
6 TO
TON
TYPICAL SECTION
S H O W I N G C A V I T Y IN JETTY
T O STA
,
25'
TYPICAL SECTION
A F T E R R E L E A S E OF C O V E R S T O N E
TYPICAL TRUNK
TO S
STA
SOUTH
TYPICAL SECTION
GULF SIDE
SHOWING REPAIRED JETTY
TYPICAL CONCRETE CAP REPAIRS
(SOUTH JETTY- 1965, NORTH JETTY-I 979;
1979 N O R T H J E T T Y T R U N K S E C T I O N
TO
TON
RTH JETTY HEAD S
Figure
Typical repair sections of the Brazos Island jetties
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