Mineralogical compositions of sediment samples from the San Francisco Bay coastal system

The mineralogical compositions of 119 samples collected from throughout the San Francisco Bay coastal system, including bayfloor and seafloor, area beaches, cliff outcrops, and major drainages, were determined using X-ray diffraction (XRD). Comparison of the mineral concentrations and application of statistical cluster analysis of XRD spectra allowed for the determination of provenances and transport pathways. The use of XRD mineral identifications provides semi-quantitative compositions needed for comparisons of beach and offshore sands with potential cliff and river sources, but the innovative cluster analysis of XRD diffraction spectra provides a unique visualization of how groups of samples within the San Francisco Bay coastal system are related so that sand-sized sediment transport pathways can be inferred. The main vector for sediment transport as defined by the XRD analysis is from San Francisco Bay to the outer coast, where the sand then accumulates on the ebb tidal delta and also moves alongshore. This mineralogical link defines a critical pathway because large volumes of sediment have been removed from the Bay over the last century via channel dredging, aggregate mining, and borrow pit mining, with comparable volumes of erosion from the ebb tidal delta over the same period, in addition to high rates of shoreline retreat along the adjacent, open-coast beaches. Therefore, while previously only a temporal relationship was established, the transport pathway defined by mineralogical and geochemical tracers support the link between anthropogenic activities in the Bay and widespread erosion outside the Bay. The XRD results also establish the regional and local importance of sediment derived from cliff erosion, as well as both proximal and distal fluvial sources. This research is an important contribution to a broader provenance study aimed at identifying the driving forces for widespread geomorphic change in a heavily urbanized coastal-estuarine system.

Bank erosion control with vegetation, San Francisco Bay, California /

Cover title.

Abstract proceedings : Fourth Forum on Innovative Hazardous Waste Treatment Technologies, Domestic and International : San Francisco, CA, November 17-19, 1992.

Mode of access: Internet.

"Fallout and disarmament"; a debate: Linus Pauling vs. Edward Teller. Presented under the auspices of KQED-TV, San Francisco for national non-commercial television.

On cover: The nuclear bomb tests ... Is fallout overrated? Fallout and disarmament; the Pauling-Teller debate.

A study of the impact of airports on the market value of real estate in the adjacent areas: New York International Airport, Chicago-O'Hare International Airport, San Francisco International Airport, (United States Naval Air Station, Glenview, Illinois), (United States Naval Air Station, Moffett Field, California)

Cover title: Airport study, 1960.

San Francisco Bay Long-Term Management Strategy (LTMS) for dredging and disposal.

"August 1996."

Presidio of San Francisco : an outline of its evolution as a U.S. Army Post, 1847-1990 /

"August 1992."

A geographic dimension for decisionmaking : conference proceedings, October 30 and 31, 1975, San Francisco, California.

Item 142-F

The savings and loan crisis [microform] : field hearings before the Committee on Banking, Finance, and Urban Affairs, House of Representatives, One Hundred First Congress, first session, San Francisco, CA, January 12 and 13, 1989.

"Serial no. 101-3."

Extracts from Report of the committee appointed Nov. 11, 1873, by the Chamber of Commerce of San Francisco, to prepare bills for legislative action on the subject of fares and freights.

C.T. Hopkins, chairman.

Catalogue of the loan exhibition of paintings by old masters, in the Palace of Fine Arts, San Francisco,

Includes indexes.

BART in the San Francisco Bay Area - the final report of the BART Impact Program.

Transportation Department, Washington, D.C.

Subsidized taxi programs for elderly and handicapped persons in the San Francisco Bay Area. Final report.

Transportation Systems Center, Cambridge, Mass.

A study of the female recidivists of normal mentality in the San Francisco juvenile court for the period from January 1917 to January 1920.

Thesis (M.A.)--Univ. of California. May, 1920.

Fisherman's Wharf area, San Francisco Bay, California, design for wave protection : physical and numerical model investigation /

Includes abstract.