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Central San Francisco Bay bathymetric change: 1855 to 1979

Dates

Publication Date
Start Date
1855
End Date
1979

Citation

Foxgrover, A.C., Fregoso, T.A., and Jaffe, B.E., 2024, Historical bathymetry and bathymetric change within San Francisco Bay, California: 1855 to 2005: U.S. Geological Survey data release, https://doi.org/10.5066/P13H35QB.

Summary

This data release provides a series of four bathymetric change grids generated from historical bathymetric surveys collected in central San Francisco Bay, CA from the 1855 to 1979. The National Ocean Service (NOS) and its predecessor, the United States Coast and Geodetic Survey, collected hydrographic surveys in 1855, 1895, 1920, 1947, and 1979. Surface modeling software was used to generate bathymetric DEMs of each of these surveys. The bathymetric DEMs were then adjusted to account for gridding interpolation bias and changes in sea level through time. The adjusted DEMs for consecutive surveys were then differenced to reveal the amount of sediment erosion and deposition and changes from human activities (e.g., dredging, sand mining, [...]

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Attached Files

Click on title to download individual files attached to this item.

CB_chg_1855_1895_m.zip 924.37 KB application/zip
CB_chg_1895_1920_m.zip 762.55 KB application/zip
CB_chg_1920_1947_m.zip 722.03 KB application/zip
CB_chg_1947_1979_m.zip 840.83 KB application/zip
CB_chg_map_1855_1895.png
“Sample map of Central Bay bathymetric change from 1855 to 1895”
thumbnail 1.15 MB image/png

Purpose

Analysis of historical bathymetric surveys enables us to reconstruct the surface of the bay floor through time and quantify spatial and temporal changes in deposition, erosion, and bathymetry over decadal timescales. These data provide insight on changes to San Francisco Bay in response to natural processes as well as anthropogenic activities and can inform numerous studies and applications such as sediment management practices, restoration projects, regional adaptation plans, contaminant transport research, and sea-level rise studies. 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 the depth of the bay floor through time. These data are not intended to be used for navigational purposes.

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