412002001

412002013

412002024

412002025

0

0 10km

10mi

KauaiQueen’sPond

HISTORICAL SHORELINES

1927 T-sheet 1950 1962

Nov

1966MayMay

1975Apr 1987Jul 1988Mar

1992SepSep

1999Nov 2006

Erosion rate measurement locations(shore-normal transects)

Historical beach positions, color coded by year, are determined using orthorectified and georeferenced aerial photographs and National Ocean Survey (NOS) topographic survey charts. The low water mark is used as the historical shoreline, or shoreline change reference feature (SCRF).

Movement of the SCRF along shore-normal transects (spaced every 66 ft) is used to calculate erosion rates.

Oct 1991

Queen’s Pond, Kauai, Hawaii

Latitude/Longitude coordinatesUTM coordinates

159o47'10" W2440300mN

20”40”

30”22

o05’20” N10”

22o04’00” N

50”10”

22o05’ N

20”

40”

30”

22o 05

’20”

N10

”22

o 04’0

0” N

50”

10”

22o 05

’ N

159o47'10" W 159o47’ W 50” 40” 30” 20” 10” 159o46’ W 50” 159o45’40” W

159o47’10” W 159o47’ W 50” 40” 30” 20” 10” 159o46’ W 50” 159o45’40” W

2440

300m

N04

0506

0708

0910

1112

1314

1516

1718

1920

2122

2324

2526

2724

4280

0mN

2440300m

N04

0506

0708

0910

1112

1314

1516

1718

1920

2122

2324

2526

2724428

00mN

418800mE 89 90 91 92 93 94 95 96 97 98 99 4200 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 421700mE

418800mE 89 90 91 92 93 94 95 96 97 98 99 4200 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 421700mE

Contract C25514 Contract 7249

Charles Fletcher, Matthew Barbee, Siang-Chyn Lim,Matt Dyer 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.

N400 300200

1200 900600

100

3000

0100

300

Scale 1:3000Meters

Feet

1

5

10

15

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

95

100

105

110

115

120

125

130

135

139

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.

AREA DESCRIPTIONQueen’s Pond study area (transects 1 – 139) covers the southern section of Polihale Beach. The beach at Queen’s Pond is composed of carbonate sand backed by vegetated dunes and sugarcane fields. The study area is exposed to swell from the north and northwest during winter and spring months. As a result, the area experiences large seasonal fluctuations of the shoreline evidenced by an average difference in summer (1987) and winter (1988) shoreline positions of approximately 100 ft. Previous studies1 do not analyze Queen’s Pond study area.

Queen’s Pond (transects 95 – 106) is a small basin along the shoreline in the northern section of the area. The area is bounded to the south by a complex of emerged shore-parallel beachrock. The average shoreline change for this study area is erosional at an average rate of -0.4 ft/yr. The northern portion of the study area (transects 70 – 139) is experiencing erosion at an average rate of -0.2 ft/yr while the southern portion (transects 1 – 69) is eroding at an average rate of -0.6 ft/yr.

Polihale State Park (transects 80 - 272) includes the northern half of Queen’s Pond study area. The average shoreline change for Polihale State Park is experiencing erosion at an average rate of -0.4 ft/yr.

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.

Shoreline C

hange R

ate (ft

/yr)

-3-2

-1

0

1

2

-3-2

-1

0

1

2

1

5

10

40

45

50

55

60

65

70

75

80

85

90

110

15

25

30

35

95

20

100

105

115

120

125

130

135

139

ManaPlain

BarkingSands

Queen’sPond

PolihaleStatePark

PolihaleStatePark