Bathymetric change analysis in San Francisco Bay, California, from 1971 to 2020
Dates
Publication Date
2023-04-05
Citation
Fregoso, T.A., Jaffe, B.E., and Foxgrover, A.C., 2023, Bathymetric change analysis in San Francisco Bay, California, from 1971 to 2020: U.S. Geological Survey data release, https://doi.org/10.5066/P9Y5PEV0.
Summary
This data release provides bathymetric change grids of four geographic areas of San Francisco Bay, California, comparing digital elevation models (DEMs) created from bathymetric data collected in the 1970s and 1980s with DEMs created from bathymetric data collected in the 2010s and 2020. These types of change analyses can provide information on the quantities and patterns of erosion and deposition in San Francisco Bay over the 9 to 47 years between surveys, and they reveals that the bay floor lost about 34 million cubic meters of sediment between the intervening time period. Results from this study can be used to assess how San Francisco Bay has responded to changes in the system such as sea-level rise and variation in sediment supply [...]
Summary
This data release provides bathymetric change grids of four geographic areas of San Francisco Bay, California, comparing digital elevation models (DEMs) created from bathymetric data collected in the 1970s and 1980s with DEMs created from bathymetric data collected in the 2010s and 2020. These types of change analyses can provide information on the quantities and patterns of erosion and deposition in San Francisco Bay over the 9 to 47 years between surveys, and they reveals that the bay floor lost about 34 million cubic meters of sediment between the intervening time period. Results from this study can be used to assess how San Francisco Bay has responded to changes in the system such as sea-level rise and variation in sediment supply from the Sacramento-San Joaquin Delta and local tributaries, and supports the creation of a new, system-wide sediment budget. These bathymetric change grids can also provide data to ecosystem managers about the quantities and patterns of sediment volume change in San Francisco Bay to assist in decision-making for a variety of sediment-related issues, including restoration of tidal marshes, exposure of legacy contaminated sediment, and strategies for the beneficial use of dredged sediment.
Click on title to download individual files attached to this item.
SFBayBathyChg1979to2020meters.png “Map showing accretion (red) and erosion (blue) in San Francisco Bay 1971-2020.”
2.17 MB
image/png
Related External Resources
Type: Related Primary Publication
Fregoso and others, 2023, Sediment deposition, erosion, and bathymetric change in San Francisco Bay, California: 1980s-2010s: U.S. Geological Survey Open-File Report 2023-1031
These data are part of a sediment change analysis project of San Francisco Bay to understand patterns of sediment gains and loss in efforts to help develop a sediment budget. These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems (GIS) or other software to identify changes in elevations between the two time periods. These data are not intended to be used for navigational purposes.
Preview Image
Map showing accretion (red) and erosion (blue) in San Francisco Bay 1971-2020.