Historical San Francisco Bay Shoreline Perspectives on the Past and Future Predicting the future of San Francisco Bay: learning from history UC Museum.

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Presentation transcript:

Historical San Francisco Bay Shoreline Perspectives on the Past and Future Predicting the future of San Francisco Bay: learning from history UC Museum of Paleontology Short Course February 6, 2010 Robin Grossinger Historical Ecology Program San Francisco Estuary Institute

I. Historical Bayscape

1800

Watkins 1861

Tidal marsh habitat and plan form geometry at the local scale

► Tidal marshes are more than pickleweed plains ► Extent of tidal channels ► Frequency of marsh pannes, salinas ► Prevalence of sandy beaches ► Upland ecotone

II. Shoreline Change

1800

2000

Acres x 1000 Open Bay (<MLLW) Intertidal (tidal flat and marsh) Ca

Acres x 1000 Open Bay (<MLLW) Intertidal (tidal flat and marsh) 2000

formed since ~1900

~1920

Salt ponds and remnant marsh at Ravenswood (San Mateo County), 1993 Shoreline change

1857 versus 1993 erosionaccretion Shoreline change

415 feet

III. Our Response

The historical practice of using stream-borne sediment to raise marsh elevations: “warping” common in South Bay years ago diverted local streams into contained baylands areas

“Advantage is taken of this rapid sedimentation both here [San Francisquito Creek] and on Alameda Creek for reclaiming the saltmarsh. The reclamation work is accomplished by building a levee around a certain portion and allowing the flood waters to spread over it and thus drop the sediment at the desired place.” Clark 1924

Thank you

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