Port Aransas Breakwaters
Port Aransas, Texas
Construction and Rehabilitation History
Two rubble-mound breakwaters, the east 8 0 ft long and the west
1,290 ft long, were constructed to provide adequate protection from
ship-generated (Corpus Christi Channel and wind-generated waves
entering the existing anchorage basin at Port Aransas (Figure 1 )
The typical cross section geometry (Figure 12) had a crown elevation
ft mlt, an 8-ft crown width, and
side slopes. Cover
stone size was 1 to 6 tons. The core and 2-ft-thick bedding layer
were made up of 0.5-in. to 200-lb stone. The landward 550 ft of the
west jetty were constructed as a sand-fill dike, with a crown eleva-
ft mlt and a top width of 20 ft. A 21-ft-wide section of
seaward side slope was revetted with a 2-ft-thick bedding
layer and cover stone layer (Figure 1 ) The revetted section was
aligned with the breakwater section so that the tops were coincident
at the harbor side of the crown width. The center line of the fill
section was about 1
behind this point. The cover stone size was
selected based on the lower cost of placing the 1- to 6-ton stone
versus the 700- to 800-lb stone size required for slope stability
(design waves of 8 7 ft and Hudson's formula). The breakwaters were
constructed on a foundation of sands and silty sands.
An inspection of the breakwaters indicated they were in good
with the exception of the revetted section of the west jetty.
Waves breaking over the shore protection had eroded the sand fill
resulting in some minor settlement of the stone.
The breakwaters were inspected and considered to be in good condition.
SCALE IN FEET
SHORE PROTECTION REACH
Figure 12. Port Aransas plan view and typical breakwater sections