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|a National Assessment of Shoreline Change: Part 1 |h [electronic resource] |b Historical Shoreline Changes And Associated Coastal Land Loss Along The U.S. Gulf of Mexico |y English. |
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|a [S.l.] : |b United States Geological Survey, |c 2004. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a Beach erosion is a chronic problem along most openocean
shores of the United States. As coastal populations
continue to grow and community infrastructures are threatened
by erosion, there is increased demand for accurate information
regarding past and present trends and rates of shoreline movement.
There is also a need for a comprehensive analysis of
shoreline movement that is consistent from one coastal region
to another. To meet these national needs, the U.S. Geological
Survey is conducting an analysis of historical shoreline changes
along open-ocean sandy shores of the conterminous United
States and parts of Hawaii and Alaska. One purpose of this
work is to develop standard repeatable methods for mapping
and analyzing shoreline movement so that periodic updates
regarding coastal erosion and land loss can be made nationally
that are systematic and internally consistent.
This report on states comprising the Southeast Atlantic
Coast (east Florida, Georgia, South Carolina, North Carolina)
represents the second in a series that already includes
the Gulf of Mexico and will eventually include the Northeast
Atlantic Coast, Pacific Coast, and parts of Hawaii and Alaska.
The report summarizes the methods of analysis, interprets
the results, provides explanations regarding the historical and
present trends and rates of change, and describes how different
coastal communities are responding to coastal erosion. Shoreline
change evaluations are based on comparing three historical
shorelines with a recent shoreline derived from lidar (Light
Detection and Ranging) topographic surveys. The historical
shorelines generally represent the following periods: 1800s,
1920s-1930s, and 1970s, whereas the lidar shoreline is 1998-
2002. Long-term rates of change are calculated using four
shorelines (1800s to lidar shoreline), whereas short-term rates
of change are calculated for the most recent period (1970s to
lidar shoreline). The historical rates of change presented in this
report represent past conditions and therefore are not intended
for predicting future shoreline positions or rates of change.
Rates of erosion for the Southeast Atlantic region were
generally highest in South Carolina along barrier islands and
headland shores associated with the Santee delta. Erosion was
also rapid along some barrier islands in North Carolina. Highest
rates of erosion in Florida were generally localized around
tidal inlets. The most stable Southeast Atlantic beaches were
along the east coast of Florida where low wave energy and
frequent beach nourishment minimized erosion. Some beach
segments in Florida accreted as a result of net longshore drift
convergence around Cape Canaveral and around tidal inlets
that were stabilized by jetties.
Seawalls, riprap revetments, and groins were constructed
in all the Southeast Atlantic states as initial community
responses to long-term beach erosion. Although some states,
such as Florida, still permit shoreline stabilization structures,
beach nourishment has become the preferred method of mitigating
long-term erosion. Beach nourishment is common in all
of the Southeast Atlantic states except Georgia. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15061858/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/18/58/00001/FI15061858thm.jpg |
