266
R.H. Charlier and Chr. P. De Meyer
Close to one hundred sites in the United States have been the beneficiaries of
Federal Government beach rebuilding projects with use of dredged material. It
has been shown that such use of dredged material has the least environmental
impact. Projects were carried out a.o. at Jacksonville Harbor, FL, Sea Girt (N.Y)
and Wrightsville Beach (NC) (photo 4) 29a.
The Miami Beach, Jacksonville, Sea Girt and Wrightstown Beach operations,
were mentioned earlier; at Redondo Beach 1,100,000 m 3 (1,441,000 cu.yd) of
materials were used to rebuild the beach.
On the U.S. side of the Strait of Juan de Fuca (Washington), periodic beach
nourishment, and foreshore revetment, are used to combat intensive erosion of
Ediz Hook spit. Beaches downcoast of Channel Islands Harbor (California) are
nourished with sand removed from a trap built there.
In all these projects, coastal defense was combined with the recreational aims to
be attained. The required sand quantities have to contribute to the predominant
longshore or offshore sediment transport capacities. Silt and clay particles are
easily removed when exposed to wave action. The sand losses (due to longshore
or offshore transport) should be considered as future maintenance material for the
beach.
Still other nourishment locations in the United States include
Cape Canaveral Beach (2.03 x 106 m 3 = 2.3 x 106 Cy.yd),
Fort Pierre (0.64 x 106 m ~ = 0.72 x 106 Cy.yd),
Jupiter Island (2.04 and 0.88 x 106 m 3 = 2.4 and 1.0 x 106 Cy.yd),
Delray Beach (1.4 x 106 m 3 = 1.6 x 106 Cy.yd),
Pompano Beach (0.91 x 106 m 3 = 1.03 x 106 Cy.yd),
Hollandale Beach (0.32 x 106 m 3 = 0.36 x 106 Cy.yd),
Key Biscayne (0.18 x 106 m 3 = 0.2 x 106 Cy.yd),
Captiva Island (0.66 x 106 m 3 = 0.75 x 106 Cy.yd),
Lido Key Beach (0.31 x 106 m 3 = 0.35 x 106 Cy.yd),
Key West (0.05 x 106 m 3 = 0.07 x 106 Cy.yd),
and Treasure Island (0.67 x 106 m 3 = 0.76 x 106 Cy.yd).
R.H. Charlier and Chr. P. De Meyer
Close to one hundred sites in the United States have been the beneficiaries of
Federal Government beach rebuilding projects with use of dredged material. It
has been shown that such use of dredged material has the least environmental
impact. Projects were carried out a.o. at Jacksonville Harbor, FL, Sea Girt (N.Y)
and Wrightsville Beach (NC) (photo 4) 29a.
The Miami Beach, Jacksonville, Sea Girt and Wrightstown Beach operations,
were mentioned earlier; at Redondo Beach 1,100,000 m 3 (1,441,000 cu.yd) of
materials were used to rebuild the beach.
On the U.S. side of the Strait of Juan de Fuca (Washington), periodic beach
nourishment, and foreshore revetment, are used to combat intensive erosion of
Ediz Hook spit. Beaches downcoast of Channel Islands Harbor (California) are
nourished with sand removed from a trap built there.
In all these projects, coastal defense was combined with the recreational aims to
be attained. The required sand quantities have to contribute to the predominant
longshore or offshore sediment transport capacities. Silt and clay particles are
easily removed when exposed to wave action. The sand losses (due to longshore
or offshore transport) should be considered as future maintenance material for the
beach.
Still other nourishment locations in the United States include
Cape Canaveral Beach (2.03 x 106 m 3 = 2.3 x 106 Cy.yd),
Fort Pierre (0.64 x 106 m ~ = 0.72 x 106 Cy.yd),
Jupiter Island (2.04 and 0.88 x 106 m 3 = 2.4 and 1.0 x 106 Cy.yd),
Delray Beach (1.4 x 106 m 3 = 1.6 x 106 Cy.yd),
Pompano Beach (0.91 x 106 m 3 = 1.03 x 106 Cy.yd),
Hollandale Beach (0.32 x 106 m 3 = 0.36 x 106 Cy.yd),
Key Biscayne (0.18 x 106 m 3 = 0.2 x 106 Cy.yd),
Captiva Island (0.66 x 106 m 3 = 0.75 x 106 Cy.yd),
Lido Key Beach (0.31 x 106 m 3 = 0.35 x 106 Cy.yd),
Key West (0.05 x 106 m 3 = 0.07 x 106 Cy.yd),
and Treasure Island (0.67 x 106 m 3 = 0.76 x 106 Cy.yd).