ERDC/CHL CHETN-IV-33
June 2001
Absolute distances from the updrift inlet edge to the updrift attachment bar, WA1, and the distance
from the downdrift inlet edge to the downdrift attachment bar, WA2, are plotted over time in
Figure 8. The plot shows the distances to the downdrift attachment bar are greater than the
distances to the updrift attachment bar for all years except 1949. There is a significant difference
in the distances after 1957, when the south jetty was constructed, after which the distance to the
downdrift attachment is consistently longer. Figure 8 shows a slight trend of increasing distance
to the downdrift attachment bar over an interval of 60 years. In contrast, after 1955, the updrift
attachment bar has remained in a relatively narrow band of locations.
St. Augustine Inlet, FL
2.0
1.5
1.0
0.5
Downdrift
Updrift
0.0
1940
1950
1960
1970
1980
1990
2000
Year
Figure 8. Distance to the downdrift and updrift attachment
bars over time for St. Augustine Inlet
3.0
St. Augustine Inlet, FL
2.5
2.0
1.5
1.0
0.5
0.0
1940
1950
1960
1970
1980
1990
2000
Year
Figure 9. Distance to most seaward point of the ebb
shoal over time for St. Augustine Inlet
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