454006003
454004001
454012001
454004010
454025013
454005037
454012006
454011003
454004013
454011004
454008063
455001002
454011002
454012011
454006001454011001
454012003
454012005
454006005
454004035
454004055
454012009454005036
454006008
454005016
454012008
454004054
454005001
454012010
454012007
454004028
454006002
454012002
454006009
454025014
454004009
455001004
4540
0404
7
454005028
4540
0404
6
454011006
4540
0404
5
454012012
455001035
4540
0404
8
4540
0403
6
454005017
4540
0404
4
455001048
454004042
455001034
4540
0404
9
4540
0403
8
454020019
454005029
4540
0403
7
454004040
454006006454005049
455001039
4540
0400
8
455001033
454019027
454025011
4540
1900
7
454004039
455001011
454020002
454020003
454020007
454020018
454004004
454009012
454004043
454019020
454004027
454019001
455001012
454019013
454019002
454020008
455001038
454008042454008045
455001008
454019014
454004003
4540
0904
9
454020017
4540
0804
8
454020015
454020016
454020011
4540
0904
8
454020010
454009033
454004026
454025006454025001
454019015
454009032
454008058
454008059
454009031
454008061
455001013
454007026
4540
0702
5
454008052
454008051
40" 30" 10"20" 159o29' W50" 159o30'10" W 159o30' W
40" 30" 10"20" 159o29' W50" 159o30'10" W 159o30' W
10"
22o 13
' N20
"22
o 12'5
0'' N
30"
40"
22o 13
'50'
' N10"
22o13' N
20"22
o12'50'' N30"
40"22
o13'50'' N
8382
8124584
00mN
2456400m
N65
6667
6880
6970
7172
7374
7576
7778
7981 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 014500448000mE 450200mE
6566
6768
6970
7172
2458
400m
N73
7475
7677
7879
8081
8283
2456
400m
N
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 014500448000mE 450200mE
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.
The Pali Ke Kua study area (transects 0 - 44) is located on the north coast of Kauai. The shoreline is composed of calcareous sand beach interrupted by basalt head-lands with a fringing reef offshore.
Overall, the area is eroding at an average rate of -0.3 ft/yr. The area lends itself to division into three portions. The southern beach (transects 0 – 23) is bounded by Hanalei River and Puu Poa Point. This section of the study area is experiencing erosion at an average rate of -0.4 ft/yr. Pali Ke Kua (transects 24 – 44) to the north of the study area has experienced erosion at an average rate of -0.2 ft/yr. Previous studies1 did not analyze the Pali Ke Kua study area shoreline.
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.
AREA DESCRIPTION
-1
0
1
-1
0
1
Shoreline Change Rate (ft/yr)
24
3031
35
40
44
25
-101
-101Sh
orel
ine
Cha
nge
Rat
e (ft
/yr)
0
5
10
15
20
23
Pali Ke Kua, Kauai, Hawaii
0
0 10km
10mi
Kauai
Pali ke kua
Latitude/Longitude coordinatesUTM coordinates
159o47'20" W2431400mN
N
400 300200
1200 900600
100
3000
0100
300
Scale 1:3000Meters
Feet Contract C25514 Contract 7249
Charles Fletcher, Matthew Barbee, Siang-Chyn Lim,Matt Dyer, Julia Ehses and Ayesha GenzUniversity 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.
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.
1930MayAug
Mar
Apr 12Jul
H-sheet19611968
1988
19751987
1975Apr 10
JanSept
20082006
Dec 1997
Hanalei River
Pali Ke KuaBeach
Puu Poa Beach
Hanalei Pier
Puu PoaPoint
0
5
10
15
20
23
24
30
31
35
40
44
25