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An Investigation of the Alcatraz Disposal Site

by M. J. Trawle, US Army Engineer Waterways, Experiment Station, Vicksburg, MS, USA,
A. M. Teeter, US Army Engineer Waterways, Experiment Station, Vicksburg, MS, USA,
B. H. Johnson, US Army Engineer Waterways, Experiment Station, Vicksburg, MS, USA,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

The Alcatraz dredged material disposal site in San Francisco Bay is a dispersive site that is not intended to accumulate disposed sediment. However, the recent discovery of shoaling at the site has raised questions about the ability of the site to disperse future new work and maintenance material dredged from bay projects. Mounded material within the site has resulted in loss of depth to less than 9 m (30 ft) referred to mean lower low water (mllw) in the eastern portion of the site. This paper discusses (a) numerical modeling conducted to estimate the short-term fate of disposed material; (b) laboratory testing conducted to determine the erodibility of deposited material; and (c) field monitoring of the disposal of both hopper-dredged and clamshell-dredged material at the site.

Subject Headings: Dredged materials | Numerical models | Waste sites | Site investigation | Material tests | Mathematical models | Erosion | California | United States

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