Salinity and temperature were measured in near-surface waters at Dumbarton Bridge in South San Francisco Bay during the 1999–2002 water years (1999WY–2002WY). The complete data set from this site, which included 1990WY–1993WY and 1995WY–1998WY, provided a time–series of observations covering a wide range of hydrologic conditions. These conditions included critically dry years and years with above-normal and near–record precipitation and discharges from the major rivers and local streams. Data collection at 15–minute intervals allowed resolution of variability associated with daily tides and other short-term phenomena. Both local stream discharges to South San Francisco Bay and Sacramento–San Joaquin River discharges to North San Francisco Bay affected salinity at Dumbarton Bridge. Salinity at Dumbarton Bridge varied with the daily tides, and the lowest salinity values (annual) coincided with precipitation and freshwater inflows usually in winter. Short–term and seasonal variations in temperature at Dumbarton Bridge typically followed changes in air temperature and solar irradiance.
Abstract
Introduction
Hydrologic Characteristics of the 1990-2002 Water Years
Hydrography, Tides, and Weather
Acknowledgments
Methods
Results and Discussion
Seasonal and Interannual Variability
Variability on Tidal Time Scales
Implications for Wastewater Dilution and Transport
Summary
References Cited
Appendix A: Illustrations
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Download the Report (WRIR03-4005.PDF, 0.7 MB)
The text of previous reports are available here in pdf format. All of these PDF files were originally prepared prior to June 21, 2001. Since that time these image only scans have been processed to make them accessible to screen-reading programs.
Download Report for the 1990-1993 Water Years: OFR-95-326 (OFR95-326.PDF, 1.2 MB)
Download Report for the 1995-1998 Water Years: OFR-98-650 (OFR98-650.PDF, 0.4 MB)
Data tables are available here in text (TXT) format.
Download Self Extracting file containing data for 1990 (Dmbwy90.EXE,
0.3 MB)
Download Self Extracting file containing data for 1991 (Dmbwy91.EXE,
0.4 MB)
Download Self Extracting file containing data for 1992 (Dmbwy92.EXE,
0.3 MB)
Download Self Extracting file containing data for 1993 (Dmbwy93.EXE,
0.4 MB)
Download Self Extracting file containing data for 1995-1998
(Dmb9598.EXE, 1.2 MB)
Download Self Extracting file containing data for 1999-2002 (Dmb9902.EXE,
0.9 MB)
Download Self Extracting file containing data for 2003 (Dmb03wy.EXE, 554 KB)
Download Self Extracting file containing data for 2004 (Dmb2004.EXE, 513 KB)
Download Self Extracting file containing data for 2005-2006 (dmb0506wy.ZIP, 1.6 MB)
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FOR ADDITIONAL INFORMATION CONTACT
David H. Peterson, dhpete@usgs.gov
Chief, Geochemistry of Rivers and Estuaries Project
U.S. Geological Survey, MS 439
345 Middlefield Road
Menlo Park, FCA 94025
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