Estimates of percent sand in cores collected in San Francisco Bay, California from 1990-2016
By Theresa A. Fregoso, Amy C. Foxgrover, Bethany Kharrazi, and Bruce E. Jaffe
https://doi.org/10.5066/P9Y7W1ZM
Dates
Published: July 23, 2025
Summary
The sediment core data presented here were compiled for use in a project studying the amount of sand either released from or stored within the bed sediments of San Francisco Bay, California from the 1980s to 2010s. Estimates of the change in sand storage in the bed sediments could be used in larger San Francisco Bay sand budget and transports studies as well as to inform management decisions regarding activities such as dredging and sand mining. This study was funded by the California Coastal Conservancy, and the U.S. Geological Survey Coastal and Marine Hazards and Resources Program.
Environmental Data
-
Analysis for estimated percent sand in cores taken from San Francisco Bay, California, 1990-2016
Sediment analysis of cores collected in San Francisco Bay, San Pablo Bay, and the Carquinez Strait and Suisun Bay, California from 1990 to 2016 for percent sand. Handwritten core logs, x-radiographs, and the cores themselves, were examined for the presence of sand.
Data Files
SanFranciscoCoreSedimentAnalysis.csv - 256.8 KB - MD5:d70a618a87f58c19fffb51b9894c7197
Metadata Files
-
10 cm intervals of percent sand content for 186 sediment cores collected in San Francisco Bay, CA, 1990-2016
Percentage of sand content provided in 10 cm intervals down the length of 186 sediment cores collected in San Francisco Bay, California in 1990-91, 2000, 2006, and 2016. Sediment data were obtained from a combination of gravity, box, and push cores ranging in length from 14 to 360 cm. Sand content percentages were obtained from a compilation of visual analyses, descriptive and graphical core logs, and grain size measurements. For the purposes of modeling variability in sand content with depth beneath the San Francisco Bay floor, percent sand content values were converted from variable layer thicknesses based upon natural breaks within the core, to regularly spaced 10-cm intervals using a weighted average.
Data Files
SanFranciscoBayPerSand10cmCores.csv - 44.6 KB - MD5:89deafcf5835f9ec77428ff22bf4537f
Metadata Files
Suggested Citation
Fregoso, T.A., Foxgrover, A.C., Kharrazi, B.; Jaffe, B. E ., 2025, Estimates of percent sand in cores collected in San Francisco Bay, California from 1990-2016: U.S. Geological Survey data release, https://doi.org/10.5066/P9Y7W1ZM.
Overview Image
