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Black John marsh is located along the Petaluma River and covers 25 hectares. We surveyed 217 elevation points and 110 vegetation plots to determine baseline conditions of the marsh. Water level loggers deployed in 2010 were used to characterize the tidal inundation patterns throughout the year. Sediment accretion rates from soil cores at Petaluma marsh were extrapolated to Black John Ecological Reserve marsh and used as input for the WARMER sea-level rise response model. WARMER projects that by 2060 Black John marsh will be dominated by low marsh vegetation and will transition into mudflat habitat by 2080.
BLACK JOHN MARSH
To download the Black John PDF Summary Report (Black John appendix from USGS Open-File Report Final report for sea-level rise response modeling for San Francisco Bay estuary tidal marshes):
Projected sea-level rise at Black John Marsh. Dark blue represents mean high water level, light blue is mean sea level. The marsh platform is accreting a constant 1.9 mm/yr, sea level rises 0.4 m by 2050 and 1.0 meter by 2100.
Below are data or web applications associated with this project.
Map of elevation sampling point locations at Black John Marsh. To learn more about this project, visit Modeling Sea-Level Rise in San Francisco Bay Estuary.
Map of the derived elevation data at Black John Marsh. To learn more about this project, visit Modeling Sea-Level Rise in San Francisco Bay Estuary.
Map of the derived elevation data at Black John Marsh with 2 cm contour lines. To learn more about this project, visit Modeling Sea-Level Rise in San Francisco Bay Estuary.