Field Activity 2019-625-FA

Identifier 2019-625-FA
Also known as ERO19
Purpose Determine temporal variability in bed sediment erodibility and investigate its causes
Location northern San Francisco Bay
Summary Push cores and suspended sediment samples collected for analysis.
Info derived Wave propoerties, currents, suspended-sediment concentration, salinity, water level, bed sediemnt grains size, bulk density, and carbon content.
Parke Snavely
MarFac; Dodge Ram truck G43-1698S
MarFac; Ford F350 pickup/stake truck; 6 pass; G82-0317H
Start Vallejo, CA 2019-06-10
End Vallejo, CA 2019-08-30
Days in the field 16
West -122.55523682
East -121.86584473
North 38.17127344
South 37.96368875


2885 Mission Street
Santa Cruz, CA95060
(831) 460-7401
Principal investigators Jessica R Lacy
Crew members
Joanne C. T Ferreira
Scientist, Staff
Andrew Stevens
Scientist, Staff
Jessica R Lacy
Scientist, Staff
Cordell Johnson
Scientist, Staff
Peter Dal Ferro
Scientist, Staff
Daniel C Powers
Scientist, Staff
Allen, Rachel
Scientist, Staff
Information specialist(s)
Joanne C. T Ferreira
Specialist, Information
Affiliate principal Maureen Downing-Kunz, CAWSC Francis Parchaso, WMA

Data types and categories

Data category: Imagery, Location-Elevation, Sampling, Time Series
Data type: Photo, Navigation, Geology, Mooring (physical oceanography)

Equipment used

Equipment Usage description Data types Datasets
camera Photo (no data reported)
GPS Navigation (no data reported)
Gomex Core Geology 1
Moorings - Tripods Mooring (physical oceanography) 2
Other Unknown, Mooring (physical oceanography), Biology Monitoring, Geochemical Monitoring (no data reported)


Datasets produced in this activity

Dataset name Equipment Description Dataset contact
Distribution of particle size in suspension at various depths from San Pablo Bay and Grizzly Bay, California, 2019 Moorings - Tripods These data present suspended particle size distributions collected by the U.S. Geological Survey (USGS) Pacific Coastal and Marine Science Center within two embayments of San Francisco Bay. Data were collected at one site in San Pablo Bay and one site in Grizzly Bay from June through August 2019, by deploying a Sequoia Scientific Laser In-situ Scattering and Transmissometry instrument (LISST 100x) from a small vessel near pre-established USGS instrument moorings. At both sites, data were collected on six dates at three depths, generally near the water surface, at mid depth, and near the sediment bed, for 1-3 minutes at each depth. LISST volume concentrations are most accurate when the optical percent transmission is above 30, as light passing through the sample volume is unlikely to be scattered by more than one particle. One file (ERO19PBP04) was removed due to poor data quality throughout the file. These files contain all samples collected, judgment should be applied when using them. Users are advised to check metadata and instrument information carefully for applicable time periods of specific data. Rachel M Allen
Hydrodynamic time-series data from San Pablo Bay and Grizzly Bay , California, 2019 Moorings - Tripods Hydrodynamic and sediment transport time-series data, including water depth, velocity, turbidity, conductivity, and temperature, were collected by the U.S. Geological Survey (USGS) Pacific Coastal and Marine Science Center within two embayments of San Francisco Bay. Data were collected in San Pablo Bay and Grizzly Bay from June to August 2019 at seven unique stations. Data files are grouped by area (shallows of San Pablo Bay, channel of San Pablo Bay, and shallows of Grizzly Bay). Each shallow site contained a variety of sensors located on two tripods and one surface mooring, while the channel site consisted of one tripod. Users are advised to assess data quality carefully, and to check metadata for instrument information, as platform deployment times and data-processing methods varied. Joanne C. T Ferreira

Datasets compiled from multiple sources

Dataset name Equipment Description Dataset contact
Grain size, bulk density, and organic carbon of sediment cores from San Pablo Bay and Grizzly Bay, California, 2019 Gomex Core Bed sediment samples were collected in San Pablo Bay and Grizzly Bays on eight days from June through November 2019, to analyze for sediment properties including bulk density, particle size distribution, and percent organic carbon. Sediment samples were collected from a small vessel near pre-established USGS instrument moorings using a Gomex box corer that was subsampled with three push cores (37 mm in diameter) per Gomex core. Six subsamples were collected from the top 5 centimeters (cm) of each push core, a few push cores included the top 8 cm. The top two subsamples were each 0.5 cm thick, and all following subsamples were each 1 cm thick. Push core samples from the first, third, and fifth centimeter depth were analyzed for grain size and percent organic carbon, while all 6 sections were analyzed for bulk density. Data are provided in a comma-delimited values spreadsheet. These data were collected as part of a collaborative project with the USGS California Water Science Center and the USGS Water Mission Area on physical and biological controls on sediment erodibility, funded by the USGS Priority Ecosystems Program for San Francisco Bay and Delta and the USGS Coastal Marine Hazards and Resources Program. Lukas T Winkler Prins


Samples collected during this field activity