Sediment accumulation in San Leandro Bay, Alameda County, California, during the 20th century - A preliminary report
Major changes made in the configuration of San Leandro Bay, Alameda County, California, during the 20th century have caused rapid sedimentation within parts of the Bay. Comparison of bathymetric surveys indicates that sedimentation in the vicinity of the San Leandro Bay channel averaged 0.7 cm/annum between 1856 and 1984. Lead-210 data collected at four shallow water sites east of the San Leandro Bay channel indicated that sedimentation rates have averaged between 0.06 and 0.28 cm/annum. Because bioturbation of bottom sediments cannot be discounted, better definition of this range in sedimentation rates would require measuring the activity of lead-210 on incoming sediments. In addition to sediment deposited in the vicinity of the San Leandro Bay channel and open, shallow areas to the east, 850,740 cu m of sediment was deposited between 1948 and 1983 in an area dredged at the mouth of San Leandro Creek. All available data indicate that between 1,213,000 and 1,364,000 cu m of sediment was deposited in San Leandro Bay between 1948 and 1983. Sediment yield data from an adjacent drainage basin, when combined with inventories of lead-210 and cesium-137, indicate that most of the sediment deposited in San Leandro Bay is coming from resuspension of bottom sediments or from erosion of marshes or shorelines of San Leandro or San Francisco Bay. 31 refs., 7 figs., 4 tabs.
- OSTI ID:
- 6706527
- Resource Relation:
- Related Information: Water Resources Investigations Report 86-4057
- Country of Publication:
- United States
- Language:
- English
Similar Records
Depositional environments of the Santa Margarita Formation in the Miocene Santa Maria basin, Huasna syncline
Long-Term Recovery of PCB-Contaminated Surface Sediments at the Sangamo-Weston / Twelvemile Creek / Lake Hartwell Superfund Site
Related Subjects
CALIFORNIA
WATER QUALITY
SEDIMENTS
ENVIRONMENTAL TRANSPORT
BAYS
CESIUM 137
EROSION
LEAD 210
TRACER TECHNIQUES
ALKALI METAL ISOTOPES
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CESIUM ISOTOPES
ENVIRONMENTAL QUALITY
EVEN-EVEN NUCLEI
FEDERAL REGION IX
HEAVY NUCLEI
ISOTOPE APPLICATIONS
ISOTOPES
LEAD ISOTOPES
MASS TRANSFER
NORTH AMERICA
NUCLEI
ODD-EVEN NUCLEI
RADIOISOTOPES
USA
YEARS LIVING RADIOISOTOPES
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
540311 - Environment
Aquatic- Basic Studies- Radiometric Techniques- (1990-)