Jetty Study 6-11-15 Estuary Meeting

Jun 11, 2015 - Adjacent to Goat Rock. Prior to jetty construction,. Goat Rock was only connected to the shore by a tombolo (low-lying sand spit). 1875...

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Goat Rock Beach Jetty Feasibility Study

Matt Brennan, PhD, PE Dane Behrens, PhD, PE June 11, 2015 Monte Rio Community Center

National Marine Fisheries Service (NMFS) 2008 Biological Opinion (BO) Estuary Management Objectives During the dry season (May 15 – October 15) More of this…

Less of this…

Inflow & Outflow

Tidal & salty

Outflow only

Perched & fresh

Why Study the Jetty? Freshwater lagoon habitat May 15 – Oct 15

Inlet morphology

Evolution of the Jetty

Jetty Components

Seismic Beach Berm Profile Beach parking lot

Beach sand

Jetty groin

Artificial rock fill

Bedrock

Beach sand

Rock fill

Bedrock

Beach Morphology: Influence of Construction Adjacent to Goat Rock Prior to jetty construction, Goat Rock was only connected to the shore by a tombolo (low-lying sand spit).

1875

Beach Morphology: Influence of Construction Adjacent to Goat Rock

Shoreline accretion of 1.5 ft/yr

Shoreline erosion of 0.8 ft/yr

Beach Morphology: Influence of Jetty Access Elements

Beach widening of 2 ft/yr

Beach Morphology: Influence of Jetty Access Elements Extensive migration

• Sites with extensive inlet migration have lower, nearly uniform beach spits

Limited migration

• Sites with less frequent inlet migration or movement have higher, less uniform beach crests

• Jetty access elements likely widened and maintained high beach south of the groin

Inlet Morphology

Jetty’s influence on self-breaching 2. Closed

1. Open

10/7/12 3. Rising water levels

10/8/12 4. Self-breach at jetty

10/15/12

10/16/12

Groundwater Seepage

BEACH

LAGOON

Seepage (cfs)

groundwater seepage

Water level difference (ft)

Groundwater Seepage Estuary

hl

River

Outlet channel

Ocean

9’ NGVD

Channel discharge MHHW 3.1’ NGVD

4’ NGVD

inflow MLLW -2.6’ NGVD

Seepage (cfs)

Groundwater seepage

Water level difference (ft)

Subsurface Beach & Jetty Monitoring

Subsurface electrical conductivity

Fresher / drier

Wetter / saltier

LBNL Seepage Summary

Jetty Study Conceptual Alternatives (For feasibility, not implementation) • No Action

Less change

• Notch Jetty • Demolish Groin In-Place • Remove Access Elements • Remove Groin • Remove Full Jetty

More change

Estuary Water Balance Model

River inflow

Exchange with groundwater table

Avg. # Days Closed (2000-2014)

Predicted effect of removing jetty access elements on closure

Increase seepage, Longer closure

More overwash, Shorter closure

Avg. # Days Closed (2000-2014)

Predicted effect of removing jetty access elements on closure

Jetty Feasibility Study – Next steps • Characterize inlet morphology in model • Complete alternatives evaluation • Draft feasibility study report • Final feasibility study report (est. August 2015)

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