Reconstructing sediment age profiles from historical bathymetry changes in San Pablo Bay, California

Estuarine, Coastal and Shelf Science
By: , and 

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Abstract

Sediment age profiles reconstructed from a sequence of historical bathymetry changes are used to investigate the subsurface distribution of historical sediments in a subembayment of the San Francisco Estuary. Profiles are created in a grid-based GIS modeling program that stratifies historical deposition into temporal horizons. The model's reconstructions are supported by comparisons to profiles of 137Cs and excess 210Pb at 12 core sites. The predicted depth of the 1951 sediment horizon is positively correlated to the depth of the first occurrence of 137Cs at sites that have been depositional between recent surveys. Reconstructions at sites that have been erosional since the 1951 survey are supported by a lack of detectable 137Cs and excess 210Pb below the upper 6-16 cm of the core. A new data set of predicted near-surface sediment ages was created to illustrate an application of this approach. Results demonstrate other potential applications such as guiding the spatial positioning of future core sites for contaminant measurements.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Reconstructing sediment age profiles from historical bathymetry changes in San Pablo Bay, California
Series title Estuarine, Coastal and Shelf Science
DOI 10.1016/j.ecss.2006.12.018
Volume 73
Issue 1-2
Year Published 2007
Language English
Publisher Elsevier
Contributing office(s) Toxic Substances Hydrology Program
Description 10 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Estuarine, Coastal and Shelf Science
First page 165
Last page 174
Country United States
State California
Other Geospatial San Pablo Bay