459001003
459001021
459001022
458002002459001024
459008001
459003035
459003040
459005019
4590
0304
4
4590
0303
6
4590
0300
9
4590
0500
1
459002035
459003001
459006005
4590
0600
6
459002036
459005013
459002051
459006001
459005017
459003034
459006004
459005028
4590
0205
2
459006003
459005005
459003041
459003031
459005018
459003039
459002032
459003029
459002048
459002072
4590
0205
5
4590
0300
8
459006002
459003038
459003033
459003030
4590
0205
7
459002046
4590
0304
2
459002033
459003005
459005020
459002034
459003048
4590
0600
9
459002050
4590
0300
7
4590
0300
3
4590
0304
5
459006011
459005004
459003002
4590
0601
2
459002031
4590
0501
4
459006010
459002047
459002063
459002070
459001025
4590
0300
4
4590
0304
6
459002066
459005029
459005008
459005022
459002067
4590
0304
7
459005026
459005021
4590
0203
9
459002071
459005027459005023
459005012
Haena, Kauai, Hawaii
0
0 10km
10mi
KauaiHaena
Latitude/Longitude coordinatesUTM coordinates
159o47'20" W2431400mN
N
8584
8324586
00mN
2456500m
N66
6768
6970
8271
7273
7475
7677
7879
8081
96 97 98 99 4400 01 02 03 04 05 06 07 08 09 10 11 12 13 14 1615 17 18 19439500mE 20 21 22 23 442400mE
96 97 98 99 4400 01 02 03 04 05 06 07 08 09 10 11 12 13 14 1615 17 18 19439500mE 20 21 22 23 442400mE66
6768
6970
7172
7374
2458
600m
N75
7677
7879
8081
8283
8485
2456
500m
N
50"40" 30" 10"20" 159o34' W 159o33'40" W50" 159o35'10" W 159o35' W
50"40" 30" 10"20" 159o34' W 40"50" 159o35'10" W 159o35' 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
159o33'40" W
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, Craig Senter 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.
Kuhio Highway
Kuhio Highway
Kuhio Highway
KailioPoint
HaenaPoint
HaenaBeach Park
HaenaState Park
AREA DESCRIPTION
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
Feb 2002
Nov 1950OctAprJul
Nov
196319751987
19951988Mar
Jan 2008
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 Haena study area (transects 0 – 156) is located on the north shore of Kauai. The area is bounded by the steep ridges of the Na Pali coast to the west and Haena Point to the east. The shoreline is composed of carbonate sand, exposed beach rock, and basalt boulders deposited by the several streams that interrupt the beach. An extensive fringing reef lies offshore resulting in varying wave approach directions at the shoreline1. The coast in this area is exposed to large seasonal swell during the winter months.
Overall, the Haena study area is experiencing erosion at an average rate of -1.0 ft/yr. The study area is divided into three areas. Haena Beach Park is located in the eastern portion of the area (transects 101 – 156) and is eroding at an average rate of -1.3 ft/yr. The central portion of the area (transects 18 – 100) is eroding at an average rate of -1.0 ft/yr. The western portion of the area (transects 0 – 17), which covers Haena State Park and Kee Beach, is eroding at an average rate of -0.5 ft/yr.
Study results generally agree with Sea Engineering (1992) 1 for this portion of coast except at Haena State Park where the vegetation line is difficult to identify with accuracy on the selected photography.
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.
-2
-1
0
-2
-1
0
0
5
10
1517
Shor
elin
e Ch
ange
Rat
e (ft
/yr)
-2
-1
0
-2
-1
0
Shoreline Change Rate (ft/yr)25 40 45 5030 35 55 60 65 70 75 80 85 90 95 10018 20
-2-1
0
-2-1
0
Shoreline Change Rate (ft
/yr)
110
120
125
130
135
140
145
150
155
115
156
101
105
0
5
10
15
20
25
30
35
40
45 50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
156155
150
145
140
135
130
125
Top Related