Accession Number:

ADA609509

Title:

Boston Harbor Dredged Material Capping Simulation

Descriptive Note:

Technical note

Corporate Author:

ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB

Personal Author(s):

Report Date:

2001-09-01

Pagination or Media Count:

11.0

Abstract:

This Coastal and Hydraulics Engineering Technical Note CHETN documents geotechnical research performed by the U.S. Army Engineer Research and Development Center ERDC specifically for the Boston Harbor Navigation Improvement Project. Laboratory modeling of the subaqueous sand capping process was conducted to allow a comparison to field performance of sand capping dredged material in a confined aquatic disposal cell. The practice of covering subaqueous contaminated disposed dredged material with a clean isolating material has been conducted since the 1970s, and is a cost-effective alternative to other disposal options Palermo et al. 1998. Capping has been especially suitable for isolating disposed contaminated dredged material in confined aquatic cells such as pre-existing subaqueous pits where the dredged material is laterally confined. An isolating cap typically composed of clean sand is superimposed on the top of the previously placed dredged material in such a fashion as to encapsulate the exposed surface of the dredged material Figure 1. Special consideration must be taken to prevent geotechnical instability induced by the addition of an overlying sand cap that often has a greater density than the underlying dredged material. A goal of successful cap design is to preserve geotechnical stability during and after cap placement. To design a cap that achieves this goal, information about the underlying dredged material s strength behavior is needed.

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Hydrology, Limnology and Potamology
  • Civil Engineering
  • Solid Wastes and Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE