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