IV. Retreating Shorelines
275
Following requirements were considered for the Ostend project : reduction of
wave overtopping of the existing sea-wall (flood prevention); prevention of
increased sedimentation in existing port access channel, as a result of the coastal
defense works; taking into account of future recreational beach activities; and
limitation of the project within the existing groin structure extension.
As sand suppletion alone would not effectively contribute to the above-mentioned
requirements, the mixed use of sand and gravel is envisioned. This approach
allows maximal regard to the transversal coastal dynamics, without any "hard"
defense structure. The gravel layer thickness, the equilibrium profile and the
overtopping frequencies of the sea-wall were tested in a wave flume. In a further
layout, wave attack and deformation of the gravel core were successfully tested in
a wave tank at the Hydraulic Research Laboratory of the Belgian Ministry of
Public Works at Borgerhout*. The mixed gravel-sand option provides apparently
a feasible and dynamically stable coastal protection.
Four alternative solutions were tested based on the idea of confining the sand in a
gravel enclosure with steeper slopes. Thereby the volume of materials needed
became considerably reduced, and so were expenditures by some 40%. Through
continuous monitoring, subsequent shore behavior has been controlled, and,
additionally the collected hydro-meteorological data thus gathered has built up a
valuable information bank for future projects (Fig. 35).
3.3.4
West Coast, Belgium
The largest beaches are located west of Ostend, in the direction of the French
border; heretofore they have not been affected by erosion. However, lately, some
concern has been voiced about the area between Coxyde (Koksijde) and Nieuport
(Nieuwpoort). A decision has been reached to provide nourishment to the area
and preliminary works completed.
3.3.5
Other locations
Still other sites for which beach nourishment has been recommended as a
deterrent for coastal erosion are Amanohashidate Beach in Japan 17 and Folly
Beach in South Carolina 29~
Due to "federalisation" of Belgium, this laboratory is no longer "national" but
"regional" ; its functions, however, remain the same.
The municipality of Borgerhout has been annexed to the City of Antwerp.
275
Following requirements were considered for the Ostend project : reduction of
wave overtopping of the existing sea-wall (flood prevention); prevention of
increased sedimentation in existing port access channel, as a result of the coastal
defense works; taking into account of future recreational beach activities; and
limitation of the project within the existing groin structure extension.
As sand suppletion alone would not effectively contribute to the above-mentioned
requirements, the mixed use of sand and gravel is envisioned. This approach
allows maximal regard to the transversal coastal dynamics, without any "hard"
defense structure. The gravel layer thickness, the equilibrium profile and the
overtopping frequencies of the sea-wall were tested in a wave flume. In a further
layout, wave attack and deformation of the gravel core were successfully tested in
a wave tank at the Hydraulic Research Laboratory of the Belgian Ministry of
Public Works at Borgerhout*. The mixed gravel-sand option provides apparently
a feasible and dynamically stable coastal protection.
Four alternative solutions were tested based on the idea of confining the sand in a
gravel enclosure with steeper slopes. Thereby the volume of materials needed
became considerably reduced, and so were expenditures by some 40%. Through
continuous monitoring, subsequent shore behavior has been controlled, and,
additionally the collected hydro-meteorological data thus gathered has built up a
valuable information bank for future projects (Fig. 35).
3.3.4
West Coast, Belgium
The largest beaches are located west of Ostend, in the direction of the French
border; heretofore they have not been affected by erosion. However, lately, some
concern has been voiced about the area between Coxyde (Koksijde) and Nieuport
(Nieuwpoort). A decision has been reached to provide nourishment to the area
and preliminary works completed.
3.3.5
Other locations
Still other sites for which beach nourishment has been recommended as a
deterrent for coastal erosion are Amanohashidate Beach in Japan 17 and Folly
Beach in South Carolina 29~
Due to "federalisation" of Belgium, this laboratory is no longer "national" but
"regional" ; its functions, however, remain the same.
The municipality of Borgerhout has been annexed to the City of Antwerp.