Analysis of Dredged Material Deposition Patterns

by Eric E. Nelson, US Army Engineer District, Seattle, United States,
Billy H. Johnson, US Army Engineer District, Seattle, United States,

Document Type: Proceeding Paper

Part of: Ports '92


Between November 1, 1989 and 30 March, 1990, nearly 1 million cubic yards of dredged material were disposed in Puget Sound as the first phase (Element I) of the construction of the Navy's homeport at Everett, Washington. All dredging was accomplished by clamshell dredge with disposal by split hull scow. The Navy's project was the first extensive use of an open water disposal site which had been established through the Puget Sound Dredged Disposal Analysis (PSDDA) program. At the completion of the Navy's dredging, post disposal monitoring detected dredged material as far as 1000 ft past the disposal site boundary. Why the spread of material exceeded the predicted limits was examined with the aid of a numerical model that simulates the short term fate of dredged material that is disposed in open water. Results from this examination indicate that certain dredging parameters must be precisely represented if the deposition patterns for future disposal operations are to be predicted accurately.

Subject Headings: Dredged materials | Numerical models | Construction materials | Waste sites | Soil pollution | Soil analysis | Site investigation | Domain boundary | Washington | United States

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