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U.S. Geological Survey Open-File Report 2010–1240

Palos Verdes Shelf Oceanographic Study: Data Report for Observations December 2007-April 2008

By Kurt Rosenberger, Marlene A. Noble, Christopher R. Sherwood, Marinna M. Martini, Joanne T. Ferreira, and Ellyn Montgomery

2011

Thumbnail of and link to report PDF (37.7 MB)Abstract

Beginning in 1997, the Environmental Protection Agency (EPA) defined a contaminated section of the Palos Verdes Shelf region in southern California as a Superfund Site, initiating a continuing investigation of this area. The investigation involved the EPA, the U.S. Geological Survey (USGS), Science Applications International Corporation (SAIC), Los Angeles County Sanitation Districts (LACSD) data, and other allied agencies.

In mid-2007, the Palos Verdes Shelf project team identified the need for additional data on the sediment properties and oceanographic conditions at the Palos Verdes Superfund Site and deployed seven bottom platforms, three subsurface moorings, and three surface moorings on the shelf. This additional data was needed to support ongoing modeling and feasibility studies and to improve our ability to model the fate of the effluent-affected deposit over time. It provided more detail on the spatial variability and magnitude of resuspension of the deposit during multiple storms that are expected to transit the region during a winter season.

The operation began in early December 2007 and ended in early April 2008. The goal was to measure the sediment response (threshold of resuspension, suspended-sediment concentrations, and suspended-sediment transport rates) to bed stresses associated with waves and currents. Other objectives included determining the structure of the bottom boundary layer (BBL) relating nearbed currents with those measured at 10 m above bottom (mab) and comparing those with the long-term data from the LACSD Acoustic Doppler Current Profiler (ADCP) deployments for nearbed current speed and direction. Low-profile tripods with high-frequency ADCPs co-located with two of the large tripods were selected for this goal.

This report describes the data obtained during the field program, the instruments and data-processing procedures used, and the archive that contains the data sets that have passed our quality-assurance procedures.

  • This report is available only on the Web.

For additional information:
Contact Information, Pacific Coastal and Marine Science Center
U.S. Geological Survey
Pacific Science Center
400 Natural Bridges Drive
Santa Cruz, California 95060
http://walrus.wr.usgs.gov/

This report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.


Suggested citation:

Rosenberger, Kurt, Noble, M.A., Sherwood, C.R., Martini, M.M., Ferreira, J.T., and Montgomery, Ellyn, 2011, Palos Verdes Shelf oceanographic study; data report for observations December 2007–April 2008: U.S. Geological Survey Open-File Report 2010–1240, 118 p., available at http://pubs.usgs.gov/of/2010/1240/.



Contents

Abstract

Introduction

Background and Objectives

Field Program

Data Processing

Results

Data Analyses

Conclusions

Acknowledgments

References Cited

two appendixes


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