1
454006003 454004001 454012001 454004010 454012006 454011003 454004013 454011004 454008063 455001002 454012011 454006001 454012003 454012005 454006005 454004035 454004055 454012009 454005036 454006008 454005016 454012008 454004054 454005001 454012010 454012007 454004028 454012002 454004009 455001004 454004047 454005028 454004046 454011006 454004045 454012012 455001035 454004048 454004036 454005017 454004044 455001048 454004042 455001034 454004049 454004038 454020019 454005029 454004037 454004040 454006006 454005049 455001039 454004008 455001033 454019027 454025011 454019007 454004039 455001011 454020002 454020003 454020007 454020018 454004004 454004043 454019020 454004027 454019001 455001012 454019013 454019002 454020008 455001038 454008042 454008045 455001008 454004003 454020017 454020015 454020016 454020011 454020010 454004026 454025006 454025001 455001013 454007026 454007025 40" 30" 10" 20" 159 o 29' W 50" 159 o 30'10" W 159 o 30' W 40" 30" 10" 20" 159 o 29' W 50" 159 o 30'10" W 159 o 30' W 10" 22 o 13' N 20" 22 o 12'50'' N 30" 40" 22 o 13'50'' N 10" 22 o 13' N 20" 22 o 12'50'' N 30" 40" 22 o 13'50'' N 83 82 81 2458400mN 2456400mN 65 66 67 68 80 69 70 71 72 73 74 75 76 77 78 79 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 01 4500 448000mE 450200mE 65 66 67 68 69 70 71 72 2458400mN 73 74 75 76 77 78 79 80 81 82 83 2456400mN 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 01 4500 448000mE 450200mE Erosion Rate Accretion 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 studies 1 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 30 31 35 40 44 25 -1 0 1 -1 0 1 Shoreline Change Rate (ft/yr) 0 5 10 15 20 23 Pali Ke Kua, Kauai, Hawaii 0 0 10km 10mi Kauai Pali ke kua Latitude/Longitude coordinates UTM coordinates 159 o 47'20" W 2431400mN N 400 300 200 1200 900 600 100 300 0 0 100 300 Scale 1:3000 Meters Feet Contract C25514 Contract 7249 Charles Fletcher, Matthew Barbee, Siang-Chyn Lim, Matt Dyer, Julia Ehses and Ayesha Genz University of Hawaii Coastal Geology Group School of Ocean and Earth Sciences and Technology 1680 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. 1930 May Aug Mar Apr 12 Jul H-sheet 1961 1968 1988 1975 1987 1975 Apr 10 Jan Sept 2008 2006 Dec 1997 Han alei River Pali Ke Kua Beach Puu Poa Beach Hanalei Pier Puu Poa Point 0 5 10 15 20 23 24 30 31 35 40 44 25

Pali Ke Kua, Kauai, Hawaii 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

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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

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454012012

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7

454004040

454006006454005049

455001039

4540

0400

8

455001033

454019027

454025011

4540

1900

7

454004039

455001011

454020002

454020003

454020007

454020018

454004004

454009012

454004043

454019020

454004027

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454019013

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454008042454008045

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454020017

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454025006454025001

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454009032

454008058

454008059

454009031

454008061

455001013

454007026

4540

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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