co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

SUNSET BEACH RSM

INVESTIGATIONS

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

SUNSET BEACH RSM

SHORELINE CHANGE ANALYSIS

Tom Smith

Honolulu District

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

HISTORICAL AERIAL

PHOTOGRAMMETRY

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

MAPPING HISTORICAL SHORELINES

portion of an aerial photo mosaic

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

OAHU COUNTY SHORELINE DATABASE

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

REACH 1 (Ke Iki Beach to Rocky Point)

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

REACH 2 (Rocky Point to Sunset Point)

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

REACH 3 (Sunset Point to Velzyland)

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

VOLUME CHANGE

1948 – 2006

57 years

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

-600

-500

-400

-300

-200

-100

0

0 50 100 150 200 250

1928

1932

1949.35

1961.67

1967.31

1971.06

1975.28

1975.42

1988.09

1996.52

2006.55

SUNSET BEACH REGION

Shoreline Toe Positions from 1928 to 2006

SOEST Transect Number

Bas

elin

eD

ista

nce

[ft

]

RO

CK

Y P

OIN

T

SU

NS

ET

PO

INT

VE

LZ

YLA

ND

KE

IK

I B

EA

CH

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

-1,500

-1,000

-500

0

500

1,000

1,500

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270

Sunset Beach Region: Transect Volume Change Rate for Various Time Periods

49-67

67-71

71-75

75-88

88-96

96-06

49-06

SOEST Transect Number

Vo

lum

e C

han

geR

ate

[cy

/yr/

ft]

RO

CK

Y P

OIN

T

SU

NS

ET

PO

INT

VE

LZ

YLA

ND

KE

IK

I B

EA

CH

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

-2.0

-1.5

-1.0

-0.5

0.0

0.5

1.0

1.5

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270

Sunset Beach Region: Transect Volume Change Rate from 1949 to 2006

49-06

Vo

lum

e C

han

geR

ate

[cy

/yr/

ft]

SOEST Transect Number

KE

IK

I B

EA

CH

RO

CK

Y P

OIN

T

SU

NS

ET

PO

INT

VE

LZ

YLA

ND

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

-756 cy/yr

162 cy/yr 268 cy/yr

-2,000

-1,500

-1,000

-500

0

500

1,000

1,500

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270

Sunset Beach Region: Cumulative Transect Volumes from 1949 to 2006 (by reach)

Reach 1

Reach 2

Reach 3

Ave

rage

Vo

lum

e C

han

ge [

cy/y

r/tr

anse

ct]

SOEST Transect Number

KE

IK

I B

EA

CH

RO

CK

Y P

OIN

T

SU

NS

ET

PO

INT

VE

LZ

YLA

ND

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

7,434

-166,785

111,400

-229,359

275,085

-16,415

-300,000

-200,000

-100,000

0

100,000

200,000

300,000

49-67 67-71 71-75 75-88 88-96 96-06

Interval [yr]

Vo

lum

e C

han

ge [

cy]

Sunset Beach: Volume Change Based on Shoreline Change

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

SHORELINE CHANGE

1975 – 2006

31 years

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

-600

-500

-400

-300

-200

-100

0

0 50 100 150 200 250

1975.28

2006.55

2015 Veg Line

SUNSET BEACH REGION

Shoreline Toe Positions for 1975 and 2006

SOEST Transect Number

Bas

elin

eD

ista

nce

[ft

]

RO

CK

Y P

OIN

T

SU

NS

ET

PO

INT

VE

LZ

YLA

ND

KE

IK

I B

EA

CH

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

-600

-500

-400

-300

-200

-100

0

0 50 100 150 200 250

1975.28

1988.09

1996.52

2006.55

2015 Veg Line

SUNSET BEACH REGION

Shoreline Toe Positions from 1975 to 2006

SOEST Transect Number

Bas

elin

eD

ista

nce

[ft

]

RO

CK

Y P

OIN

T

SU

NS

ET

PO

INT

VE

LZ

YLA

ND

KE

IK

I B

EA

CH

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

-600

-500

-400

-300

-200

-100

0

0 50 100 150 200 250

Landward

Seaward

2015 Veg Line

SUNSET BEACH REGION

Landward and Seaward Shoreline Toe Positions from 1975 to 2006

SOEST Transect Number

Bas

elin

eD

ista

nce

[ft

]

RO

CK

Y P

OIN

T

SU

NS

ET

PO

INT

VE

LZ

YLA

ND

KE

IK

I B

EA

CH

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

0

50

100

150

200

250

300

350

0 50 100 150 200 250

Difference

SUNSET BEACH REGION

Difference Between Landward and Seaward Shoreline Toe Positions from 1975 to 2006

SOEST Transect Number

Bas

elin

eD

ista

nce

[ft

]

RO

CK

Y P

OIN

T

SU

NS

ET

PO

INT

VE

LZ

YLA

ND

KE

IK

I B

EA

CH

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

REGIONAL SEDIMENT BUDGET

1975 – 2006

31 years

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

RO

CK

Y P

OIN

T

SU

NS

ET

PO

INT

VE

LZ

YLA

ND

KE

IK

I B

EA

CH

REACH 1-604 cy/yr

(+-)

30

0,0

00

REACH 2+1,600 cy/yr

(+-)

30

,00

0

REACH 3-60 cy/yr

(+-)

7,0

00

??? ???0 ???

SUNSET BEACH RSM

REGIONAL SEDIMENT BUDGET 1975 – 2006

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

RO

CK

Y P

OIN

T

SU

NS

ET

PO

INT

VE

LZ

YLA

ND

KE

IK

I B

EA

CH

REACH 1Stable

(+-)

30

0,0

00

REACH 2+2,000 cy/yr

(+-)

30

,00

0

REACH 3Stable

(+-)

7,0

00

0 ???

SUNSET BEACH RSM

REGIONAL SEDIMENT BUDGET 1975 – 2006

0 0

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

QUESTIONS

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

COASTAL DATA COLLECTION

Robert Walker

University of Hawaii

co-sponsored by:

State of Hawaii Department of Land and Natural Resources

US Army Corps of Engineers, Honolulu District

WEST MAUI RSM

COASTAL MODELING

Jessica Podoski

Honolulu District