Evolving coastal landscape: Jockey's Ridge sand dunes

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Evolving coastal landscape Jockey's Ridge sand
dunes
2001 DEM (20ft resolution) based on NC Floodplain
lidar survey
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Jockey's Ridge dune field
1998 land cover 1999 DEM
Lidar-based 1m resolution DEM interpolated by RST
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Jockey's Ridge State Park
4 distinct dunes
direction of the 2003 view
z 75 ft
West
Main
East
z 6 ft
sand pavement vegetation
South
2003 view from NE
RTK-GPS test points
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Diverse elevation data
Photogrammetry 5ft contours
1974
1995
1998
Lidar 0.15m v. accuracy, 1 point per 3m
1999
2001
2004
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Topographic analysis I
Evolution of the Main dune slip faces
2001
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Topographic analysis II
2001 Profile Curvature Map profile curvature gt
0.008 m-1 defines the dune crests
crescentic dunes
crescentic in transition to parabolic
convex concave
2001 lidar
parabolic dune
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Horizontal dune migration
South and East dunes 20 ft/y
Main West 10 ft/y
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Elevation change
D
A
N
1995 2001 6 year change
1974 1995 21 year change
15m -10m
gain loss
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Dune field evolution
1995 2001
1974 1995
D
A
N
6 year change
21 year change
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Main peak evolution
N
A
1974
2001
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History Sand hills but no elevation data
1862
1795
1862
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History Sand hills but no elevation data
1862
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History 1915-1950 rapid growth ?
1953
1917
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Aerial Photography
D
1932 all sand
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East dune elevation change
D
A
2000 2002
Minigolf castle burried by the dune in 80s
emerged in 2000
2003
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Jockey's Ridge today
Fall 2005
Summer 2005
Visitors had minimal impact on loss of elevation
it did not change after the park was established
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House threatened by the dune
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similar dune in Japan
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Questions

• New data area available for 2007 and 2008
• does the sand from north deposit get to the top
  of the Main dune?
• are the rates changing?
• is there a seasonal back-forth movement?
• how is the vegetation changing the dune?
• did it really grow between 1917-1949 and why?

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1974
2001
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