Munyon Island Docking Facility, Florida
oastal Systems International, Inc. (Coastal
Systems) designed the docking facility for the
John D. MacArthur Beach State Park on
Munyon Island in Palm Beach County. A
preliminary design report was prepared for Palm Beach
County based on hydrographic and marine resource surveys
conducted by Coastal Systems. Three alternatives designs
were prepared to optimize dock layouts and wave
attenuation structures.
Construction cost estimates and an
engineering report was prepared.
Coastal Systems was then retained by the Florida
Department of Environmental Protection (DEP) Parks to
complete the final engineering design and prepare
construction documents for the selected option. The final
design consisted of a pile-crib breakwater for wave
attenuation under the access dock that connects to the shore
on the west side of the island with a 20-slip floating dock
facility. The pile crib breakwater extends approximately
130 feet from shore under the dock and serves three
purposes: 1) approach pier for public access to the floating
docks, 2) wave attenuation for wind-generated waves and
boat wakes, and 3) habitat for marine resources. A
statistical analysis was conducted to provide wave
characteristics (height, period) for the design of breakwater
with respect to the selected 25-year coastal storm return
period.
Wave forces were calculated for the structural design of the
piles, caps, and slabs that support the pier structure. Wave
transmission studies were conducted to specify
characteristics and geometry of the rock to be placed in the
crib for optimum wave attenuation. Details for structural
precast piles, caps, and slabs were developed due to the
remote island construction. Fiberglass grating was specified
to span concrete slabs along the pile-crib structure to
provide a composite design, to relieve uplift pressures from
storm wave action and to provide light penetration for
seagrass. The design provides ADA accessibility slips, as
well as a slip for maintenance vehicles.
Coastal Systems performed pre/post construction surveys of
the adjacent seagrass beds, and is performing the seagrass
monitoring over the five-year period. Coastal Systems
worked with the DEP to modify the seagrass monitoring
conditions to reduce monitoring costs over the five-year
monitoring period.
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