Science Center Objects

Coon Island marsh is located along the Napa River and covers 99 hectares. We surveyed 799 elevation points and 364 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 were used as input for the WARMER sea-level rise response model. WARMER projects that by 2070 Coon Island marsh will be dominated by low marsh vegetation and will transition into mudflat habitat by 2090. 

Coon Island marsh is located along the Napa River and covers 99 hectares. We surveyed 799 elevation points and 364 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 were used as input for the WARMER sea-level rise response model. WARMER projects that by 2070 Coon Island marsh will be dominated by low marsh vegetation and will transition into mudflat habitat by 2090. 

COON ISLAND MARSH

WERC Coon Island study area
(Public domain.)
WERC Coon Island Figures
The elevation histogram for Coon Island Marsh shows the marsh platform is below MHW on average (Fig. 1). Data from the vegetation surveys indicate relatively high species richness (Fig. 2).  Results from WARMER response model indicate that Coon Island will lose relative elevation as sea levels rise (Fig. 3). The marsh platform at Coon Island Marsh is projected to transition to low marsh habitat by 2070 and be below mean sea level by 2090 (Fig. 4). The percent of time Coon Island Marsh is inundated varies throughout the year by season, with the most inundation during the winter (Fig. 5). (Public domain.)
WERC Coon Island WARMER results
(Public domain.)

To download the Coon Island PDF Summary Report (Coon Island appendix from USGS Open-File Report: Final report for sea-level rise response modeling for San Francisco Bay estuary tidal marshes):