429001001
429001009
429001007
429001002
429001010
428021001
429001003
429001008
428020008
4280
2104
1
4290
0100
4
428028999
30"20" 10" 50"159o26' W 40" 159o25'10" W20"159o26'30" W
30"20" 10" 50"159o26' W 40" 159o25'10" W20"159o26'30" W
21o 5
3' N
21o 5
2'10
" N
40"
30"
50"
21o 5
3'10
" N
20"
21o53' N
21o52'10" N
40"30"
50"21
o53'10" N20"
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 6564 66 67 456800mE454400mE
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 6564 66 67 456800mE454400mE
8990
9192
9394
9596
9798
9987
8688
2420
001
0203
0424
2050
0mN
8524
1840
0mN
8990
9192
9394
9596
9798
9987
8688
2420001
0203
0424205
00mN
8524184
00mN
AREA DESCRIPTIONThe Shipwreck Beach study area (transects 0– 20) is located on the southeast coast of Kauai. The shoreline is composed of carbonate sand beach interrupted by basalt headlands. Overall, the area is experiencing erosion at an average rate of -1.2 ft/yr. Previous studies1 found similar trends in shoreline change for the Shipwreck Beach study area. 1 Makai Ocean Engineering and Sea Engineering, 1991 Aerial Photograph Analysis of Coastal Erosion on the Islands of Kauai, Molokai, Lanai, Maui, and Hawaii. State of Hawaii Office of Coastal Zone Management Program.
HISTORICAL SHORELINES
Erosion rate measurement locations(shore-normal transects)
Historical beach positions, color coded by year, are determined using orthorectified and georefer-enced aerial photographs and National Ocean Survey (NOS) topographic survey charts. The low water mark is used as the historical shore-line, or shoreline change reference feature (SCRF).
Movement of the SCRF along shore-normal transects (spaced every 66 ft) is used to calcu-late erosion rates.
T-sheet 1927
May 2000
Apr 1975Jan
Mar
1982
19881987Jul
Oct 2007
Erosion RateAccretion Rate
SHORELINE CHANGE RATES
Historical shoreline positions are measured every 66 ft along the shoreline. These sites are denoted by yellow shore-perpendicular transects. Changes in the position of the shorelines through time are used to calculate shoreline change rates (ft/yr) at each transect location.
Annual shoreline change rates are shown on the shore-parallel graph. Red bars on the graph indicate a trend of beach erosion, while blue bars indicate a trend of accretion. Approximately every fifth transect and bar of the graph is numbered. Where necessary, transects have been purposely deleted to maintain consistent alongshore spacing. As a result transect numbering is not consecutive everywhere. The rates are smoothed alongshore using a 1-3-5-3-1 technique to normalize rate differences on adjacent transects.
-3
-2
-1
0 -3
-2
-1
0
Shoreline Change Rate (ft/yr)
0
5
10
15
20
Shipwreck Beach, Kauai, Hawaii
400 300200
1200 900600
100
3000
0100
300
Scale 1:3000Meters
Feet Contract C25514 Contract 7249
Charles Fletcher, Matthew Barbee, Siang-Chyn Lim,Julia Ehses, Matt Dyer, and Ayesha Genz University of Hawaii Coastal Geology GroupSchool of Ocean and Earth Sciences and Technology1680 East West Road, Honolulu, HI 96822, U.S.A.
The preparation of this poster was financed in part by the Coastal Zone Management Act of 1972, as amended, administered by the Office of Ocean and Coastal Resource Man-agement, National Ocean Service, National Oceanic and Atmospheric Administration, United States Department of Commerce, through the Office of Planning, State of Hawaii.
Latitude/Longitude coordinatesUTM coordinates
159o26'30" W2418400mN
0
0 10km
10mi
Kauai
Shipwreck Beach
N
0
5
10
15
20
ShipwreckBeach
KeoniloaBay
Makawehi
