Environment and development in coastal regions and in small islands |
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Wise practices for
coping with beach erosion: Antigua & Barbuda
Fisheries Division, Antigua and Barbuda
Development Control Authority, Antigua and Barbuda
University
of Puerto Rico, Sea Grant College Program
Caribbean Development Bank
UNESCO
Environment and Development in Coastal Regions and in Small Islands
FORCES
TO BE RECKONED WITH
Beaches
are continuously changing – from day to day, month to month and year to year
– as the natural forces of wind and water meet the land. These changes, which
have been taking place for millions of years, are linked to variations in wind,
waves, currents and sea level height.
But
it is not just natural forces that change the beach, humans have a big role to
play in this process as well, through mining stones and sand from the beaches
and dunes, polluting and damaging coral reefs, and constructing buildings and
walls too close to the sea.
Changes
in the beaches affect everyone. The coast is a place we are all attracted to for
recreation, sports and simple enjoyment. This constantly changing and
hazard-prone coastal environment is also where the greatest financial investment
is concentrated, as large tourism properties and establishments continue to be
attracted towards the shores of Antigua and Barbuda. Tourism is a driving force in
the country’s economy so the state of its beaches is of major importance.
Natural
forces
Since
1995, the Atlantic Basin (including the Atlantic Ocean, the Caribbean Sea, and
the Gulf of Mexico) has entered a more active hurricane cycle, which may
continue for more than 20 years. |
Hurricane frequency between 1990 and 1999 in the Atlantic Basin |
Source: Gray et al. http://typhoon.atmos.colostate.edu/forecasts/1999/nov99/ |
In
the Atlantic Basin the number of really severe hurricanes (categories 3, 4 and
5) increased from one per year (1990 –1994) to four per year (1995 – 1999).
Human forces |
Pipes discharging |
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WHAT’S
HAPPENING WITH ANTIGUA AND BARBUDA'S
BEACHES?
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In order to manage these changes, beaches have been monitored since 1991
in Antigua and since 1995 in Barbuda by the Fisheries Division, who measure the beach
slope and width every three months at numerous sites around the two
islands. |
Location
of monitored beaches
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SAND IN, SAND OUT
When Hurricane Luis struck in 1995, much of the beach was lost at Runaway Bay and at other beaches in Antigua and Barbuda. In the months and years after the hurricane beaches recovered, but not to pre-hurricane levels.
BEACH
PROFILE |
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Prior to
Hurricane Luis |
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After
Hurricane Luis |
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DUNES AS RESERVOIRS OF SAND
Dunes function as reservoirs of sand,
supplying beaches during storms and protecting
coastal land from flooding.
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Low dunes at
Willoughby Bay, Antigua, were |
Much of Barbuda’s coastline and many of Antigua’s bays are fringed with low sand dunes. Many of these dunes were severely eroded during Hurricanes Luis and Georges, as can be seen below at Coco Point. Since dunes take decades to become established, it is especially important to keep their natural vegetative cover.
BEACH
PROFILE |
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HERE
TODAY,
GONE TOMORROW
The tables show generalized rates of change at the measured beaches in Antigua and Barbuda. During the 1990s, some of the beaches showed erosion, while others showed sand build-up (or accretion). Furthermore, many beaches showed erosion along one part of the beach and accretion at adjacent sections, e.g. Runaway Bay where the northern end eroded and the southern end accreted. So these figures must be treated as average trends.
Beach change rates in Antigua between 1992 and 1999 (metres per year) |
Beach change rates in Barbuda between 1995 and 1999 (metres per year) |
A
negative rate of change (–) indicates erosion and retreat of the shoreline,
a
positive |
This coastal
highway |
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WISE
PRACTICES FOR A HEALTHY BEACH
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The
state of the beach affects everyone’s lives. There are no simple or
universal solutions to shoreline erosion, since there are often several
factors, both human and natural, contributing to the problem at a
particular beach. Each beach behaves differently, so it is advisable
to find out as much information as possible about a particular beach
before taking any corrective action. It is necessary to consult the
Development Control Authority before undertaking any action at a beach. Some
forces of change, such as hurricanes and winter swells are natural,
and there is little we can do to stop them, yet there are ways we
can help to slow down the rate of erosion:
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Recommended coastal development setback distances in Antigua |
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300ft (90m) FROM VEGETATION LINE No development |
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Abandoned sand mining pits need to be restored and replanted, Spanish Point, Barbuda, 1998
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For
more information on shoreline Fisheries Division Development Control Authority |
For
more information on shoreline Coping
with Beach Erosion
This
booklet is a result of |
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Illustrations: Barbara Navi – Photographs: Gillian Cambers – Design: Eric Loddé