Jacobson_MuirBeach_FinalBoards

Monitoring Restoration Effectiveness of Lower Redwood Creek Restoration at Muir Beach

Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX, Getmapping,Aerogrid, IGN, IGP, swisstopo, and the GIS User Community

0 1 20.5 Miles

Muir Woods National MonumentMuir Beach SiteRegional Watersheds

Redwood Creek Watershed

Muir Woods

Watershed

Restoration ActivitiesLand Use

Habitat Conditions

Watershed Processes

Biological Response

Holistic ApproachProcess-Based Restoration

0

50

100

150

200

250

300

350

pre-‐1840 1841-‐1920 1921-‐1980 1981-‐2002

Sedimen

t Produ

c8on

Es8mates

(t km

-‐2a-‐

1 )

Sediment Produc8on Es8mates Sediment Production Estimates Historical Extent of Big Lagoon

A. The channelperiodically occupies areas previously "out of bounds‟

B. Channel and beach adjustment is not confined by the new arrangement of features

C. There are no zones of aggradation or incision that develop in response to constraint on or excess sediment transport.

A. Does the restored channel convey the 1.5-‐year flood event at bank top elevations, such that flows above this level inundate the floodplain?

B. Does the restored channel migrate within the restored area during 1.5–2 yr flood flows?

A. Relief ratioof the channel thalweg and floodplain remains approximately constant through time

B. Relative beach profile remains similar

4. Restore natural beach processes.

C. Does the restored creek significantly alter the hydroperiod of lagoon closure and wave overwash episodes?

Comparison of pre-‐ project and post-‐project hydro-‐period. 5–50 years

5. Re-‐establish natural lateral and longitudinal connectivity among channel, floodplain, riparian, and upland habitats.

Is lateral and longitudinal connectivity among channel, floodplain, riparian and upland habitats re-‐established and sustained as a result of restoration actions?

A. Length of connected in the restoration area is increased and sustained during 1.5-‐year flood events and above.

10 years

Success Criteria

A. Channel flow occupies a bank-‐top elevation during statistically “bankfull” flood events.

Effectiveness Monitoring Testable Element

TimeframeRestoration Objective

1. Remove constraints to natural geomorphic processes, such as sediment transport, channel migration, channel-‐floodplain interaction, and seasonal and long-‐term beach change.

Does the modification of existing constraints (e.g. visitor parking lot, Pacific Way bridge, levee road) allow (A, B) unrestricted channel-‐floodplain interaction, beach adjustment and (C) unimpeded sediment transport within the restored area?

50 years

2. Rely on geomorphic processes to maintain and support the restoration.

5–50 years

Effectiveness Monitoring Framework, Lower Redwood Creek Restoration at Muir Beach

Process: Hydrology and Geomorphology

3. Accommodate future watershed sediment delivery.

Does the restored channel and floodplain (A) retain relative relief in the context of (B) sediment delivery into the restored area and (C) evolution of the beach profile?

5–50 years

Project Implementation

Phase 1 (2009)• Excavated fill adjacent to visitor parking lot• Added backwater extension to lagoon

Phase 2 (2010)• Constructed 550-ft channel segment temporarily connected to the

downstream end of the existing channel with a culvert through the levee road

• Removed gravel along 615 feet of channel upstream of Pacific Way Bridge and 490 feet downstream to use in channel construction

• Constructed new alignment of Green Gulch Tributary• Constructed side channels S5 and S6• Installed large woody debris in new channels

Phase 3 (2011)• Constructed pools, riffles, and placed large woody debris• Constructed tie-ins from the 2010 channel to the existing channel

upstream and downstream• Constructed backwater complex• Converted former channel to side channel habitat• Installed new pedestrian bridge• Removed levee road

Phase 4 (2013)• New parking lot alignment installed• Constructed two secondary channels upstream of lagoon• Remaining section of pedestrian bridge installed• Headcut draining into expanded lagoon was filled to match

floodplain grades

Site Map Through Phase 4

¯0 160 32080 Feet

Backwater Complex

Fill Removed

New Secondary Channels

Parking Lot Rotation

Lagoon Expansion

Pacific Way Bridge

S5

S6

S4Former Channel

Green Gulch Tributary

New Channel Alignment

Levee Road Removed

Large Woody Debris Installed

Juvenile coho salmon

Borrowed from Stillwater Sciences, 2004

Pre-Project Site Map

¯0 210 420105 Feet

Pre-Project Lagoon

Pacific Way Bridge

Highway 1Crossing

Levee Road

Trib

utar

y

Green Gulch Tributary

Redwood Creek

Paci

fic W

ay

Muir Beach Site 1960’s

6

7

8

9

10

11

12

5 15 25 35 45 55 65 75 85

Elev

a&on

(+ N

AVD

)

Distance from Le+ Endpoint (+)

Cross Sec&on 18+25 Profile Fall 2011, 2012, 2013, 2014

Nov-‐11

Nov-‐12

Nov-‐13

14-‐Aug

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6

8

10

12

14

0 10 20 30 40 50 60 70 80 90

Elev

a&on

(+ N

AVD

)


Cross Sec&on 23+31 Fall 2011, 2012, 2013

Nov-‐11

Nov-‐12

Nov-‐13

14-‐Aug

Flood Inundation and Channel Connectivity

Channel Morphology

Flood Events (100-150 cfs)Recurrence Interval <1 YearNumber of times inundated

1

2

3

as-built features

Flood Events (500-900 cfs)Recurrence Interval 1.5-3.5 YearNumber of times inundated

1

2

3

as-built features

XS_A

XS_B

16+84

24+48

15+49

23+31

26+9

3

14+36

26+4

0

27+50

28+44

29+74

22+00

21+3

2

20+34

19+68

18+25

¯0 100 20050 Feet

-‐1.35

-‐1.41

0.20

1.60

2.14

0.90

-‐0.22

0.05

-‐0.68

-‐0.56

-‐1.56

-‐1.03

0.16

1.35

1.60

2.38

1.36

0.08

0.59

-‐0.08

-‐0.34

-‐2.00

-‐1.50

-‐1.00

-‐0.50

0.00

0.50

1.00

1.50

2.00

2.50

-‐1.35

-‐1.41

0.20

1.60

2.14

0.90

-‐0.22

0.05

-‐0.68

-‐0.56

-‐1.56

-‐1.03

0.16

1.35

1.60

2.38

1.36

0.08

0.59

-‐0.08

-‐0.34

-‐2.00

-‐1.50

-‐1.00

-‐0.50

0.00

0.50

1.00

1.50

2.00

2.50

-‐1.35

-‐1.41

0.20

1.60

2.14

0.90

-‐0.22

0.05

-‐0.68

-‐0.56

-‐1.56

-‐1.03

0.16

1.35

1.60

2.38

1.36

0.08

0.59

-‐0.08

-‐0.34

-‐2.00

-‐1.50

-‐1.00

-‐0.50

0.00

0.50

1.00

1.50

2.00

2.50

-‐1.35

-‐1.41

0.20

1.60

2.14

0.90

-‐0.22

0.05

-‐0.68

-‐0.56

-‐1.56

-‐1.03

0.16

1.35

1.60

2.38

1.36

0.08

0.59

-‐0.08

-‐0.34

-‐2.00

-‐1.50

-‐1.00

-‐0.50

0.00

0.50

1.00

1.50

2.00

2.50

2.35

-‐1.35

-‐1.41

0.20

1.60

2.14

0.90

-‐0.22

0.05

-‐0.68

-‐0.56

-‐1.56

-‐1.03

0.16

1.35

1.60

2.38

1.36

0.08

0.59

-‐0.08

-‐0.34

-‐2.00

-‐1.50

-‐1.00

-‐0.50

0.00

0.50

1.00

1.50

2.00

2.50

-‐1.35

-‐1.41

0.20

1.60

2.14

0.90

-‐0.22

0.05

-‐0.68

-‐0.56

-‐1.56

-‐1.03

0.16

1.35

1.60

2.38

1.36

0.08

0.59

-‐0.08

-‐0.34

-‐2.00

-‐1.50

-‐1.00

-‐0.50

0.00

0.50

1.00

1.50

2.00

2.50

-‐1.35

-‐1.41

0.20

1.60

2.14

0.90

-‐0.22

0.05

-‐0.68

-‐0.56

-‐1.56

-‐1.03

0.16

1.35

1.60

2.38

1.36

0.08

0.59

-‐0.08

-‐0.34

-‐2.00

-‐1.50

-‐1.00

-‐0.50

0.00

0.50

1.00

1.50

2.00

2.50

-‐1.35

-‐1.41

0.20

1.60

2.14

0.90

-‐0.22

0.05

-‐0.68

-‐0.56

-‐1.56

-‐1.03

0.16

1.35

1.60

2.38

1.36

0.08

0.59

-‐0.08

-‐0.34

-‐2.00

-‐1.50

-‐1.00

-‐0.50

0.00

0.50

1.00

1.50

2.00

2.50

-‐1.35

-‐1.41

0.20

1.60

2.14

0.90

-‐0.22

0.05

-‐0.68

-‐0.56

-‐1.56

-‐1.03

0.16

1.35

1.60

2.38

1.36

0.08

0.59

-‐0.08

-‐0.34

-‐2.00

-‐1.50

-‐1.00

-‐0.50

0.00

0.50

1.00

1.50

2.00

2.50

-‐1.35

-‐1.41

0.20

1.60

2.14

0.90

-‐0.22

0.05

-‐0.68

-‐0.56

-‐1.56

-‐1.03

0.16

1.35

1.60

2.38

1.36

0.08

0.59

-‐0.08

-‐0.34

-‐2.00

-‐1.50

-‐1.00

-‐0.50

0.00

0.50

1.00

1.50

2.00

2.50

Change in Thalweg Eleva4on

Change in Average Bed Eleva4on

Flood Events 2011-2014

Number of times inundated1

2

3

4

5

6

7

8

as-built features

March 12, 2012 - View looking downstream



February 3, 2014 - View looking downstream

February 3, 2014 - View looking downstream

July 11, 2014 - View looking downstream

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Cross Sec&on 26+93 Profile Fall 2011, 2012, 2013, 2014

Nov-‐11

Nov-‐12

Oct-‐13

14-‐Aug

Longitudinal Profile

Cross Sections

December 12, 2014 - March 17, 2012 - 567 cfs

-‐5

0

5

10

15

20

25

-‐50 50 150 250 350 450 550 650 750 850

Elev

a&on

(+ N

AVD

)

Horizontal Distance from F1 (+)

Beach Transect F Profile 2012, 2013, and 2014

Spring 2012

Spring 2013

Spring 2014

-‐5

0

5

10

15

20

25

-‐50 50 150 250 350 450 550 650

Elev

a&on

(+ N

AVD

)

Horizontal Distance from C1 (+)

Beach Transect C Profile 2011, 2012, 2013, and 2014

Winter 2011

Spring 2012

2013 Spring

2014 Spring

271

239

168

195

223

177

365

204

190

158

204

272

228

17

158

40

99

155

126

98

114

0

104

100

146

86

25

3

8

22

42

54

27

42

44

44

74

57

9

61

52

68

39

190

33

131

14

6

13

82

112

156

52

17

82

19

13

36

13

27

1-‐Jan

15-‐Jan

29-‐Jan

12-‐Feb

26-‐Feb

11-‐M

ar

25-‐M

ar

8-‐Ap

r

22-‐Apr

6-‐May

20-‐M

ay

3-‐Jun

17-‐Jun

1-‐Jul

15-‐Jul

29-‐Jul

12-‐Aug

26-‐Aug

9-‐Sep

23-‐Sep

7-‐Oct

21-‐Oct

4-‐Nov

18-‐Nov

2-‐De

c

16-‐Dec

30-‐Dec

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

2012

2013

2014

Length (days)

Year

Lagoon Mouth Open and Close Periods Open Closed

¯

Transect Lines201420132012

AB

C

D EF G

H

IJ

KL

Lagoon Seasonal Closure

Beach Transects

February 12, 2012 - Lagoon Open Condition

February 10, 2013 - photograph showing overwash event

September 11, 2012 - Lagoon Closed Condition

Prepared by: Allison JacobsonCandidate- Master of Landscape Architecture Environmental Planning

Conclusions• Initial response in sediment dynamics exceeded expectations; however, the

channel is still new. Aggradation is occuring in the fluvial reach, but will likely be transported downstream as the channel adjusts and the site experiences larger rain events.

• Flood inundation is occuring below a 1-year recurrence interval rain event enhancing channel-floodplain connection and exceeding success criteria.

• Too early to determine if beach adjustment is affected by project implementation.

• Hydro-period of lagoon closure is shown to be unaltered by project, and is still functioning as anticipated.

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Beach Morphology and Lagoon Function

Winter Off-Channel Habitat Connectivity2009

Winter Flows Low Low High Low High Low Intermediate Low High Low High

Dates 5/6/09 2/17-‐2/18/10 1/25-‐1/26/10 1/24 -‐1/25/11 3/21 -‐ 3/22/11 2/13 -‐ 2/14/12 3/26 -‐ 3/28/12 2/25/13 12/4/12 2/24/14 4/01-‐ 4/02/14

Mean Daily Discharge

26 cfs 14-‐15 cfs 66-‐121 cfs 5 cfs 49-‐75 cfs 8 cfs 29-‐61 cfs 2 cfs 35 cfs 4 cfs 21-‐27 cfs

S5 not constructed

not tied in to main channel X X X X X

S6 not constructed

not tied in to main channel X X X X X

Green Gulch X S4 X XFormer Channel X X X

Backwater Complex

not constructed

Expanded Lagoon

not constructed

X

(at least connected at downstream end)

Off-‐channel habitat disconnected from main channelFeature not constructed or tied in to main channelIndicates side channel was connected to main channel (habitat feature was mapped outside of main channel)

(at least connected at downstream end)

Side Channel

Secondary Channels

not constructed

2010 2011 2012 2013 2014

10

20

30

40

50

60

70

1948

-49

1950

-51

1952

-53

1954

-55

1956

-57

1958

-59

1960

-61

1962

-63

1964

-65

1966

-67

1968

-69

1970

-71

1972

-73

1974

-75

1976

-77

1978

-79

1980

-81

1982

-83

1984

-85

1986

-87

1988

-89

1990

-91

1992

-93

1994

-95

1996

-97

1998

-99

2000

-01

2002

-03

2004

-05

2006

-07

2008

-09

2010

-11

2012

-13

Rain

fall

(inch

es)

Years

Annual Rainfall Recorded at Muir Woods

Wet Years

Dry Years

Average Rainfall 37.76"

Mean annual precipitation of 37.76 inches

Expanded Lagoon

LagoonBeach berm

Annual Rainfall

Jacobson_MuirBeach_FinalBoards

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