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Techniques for Long-Term Management of Confined Disposal Areas

Techniques for Long-Term Management of Confined Disposal Areas
Author: Marian E. Poindexter
Publisher:
Total Pages: 6
Release: 1987
Genre:
ISBN:
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Systematic management of confined dredged material disposal sites is becoming increasingly necessary as competition for land use intensifies in regions in which most dredging projects are located. Long-term management of either single or multiple disposal sites entails determination of the storage capacity required to contain the sediments to be dredged over a period of years. Techniques for constructive management of confined disposal sites have been developed at the US Army Engineer Waterways Experiment Station. The purpose of this paper is to present techniques to be utilized in long-term management of confined dredged material disposal areas. The large strain consolidation behavior of dredged material and use of an available finite strain mathematical model are discussed. Recommendations will be made concerning operation of the disposal site(s) to maximize potential service life or available storage capacity.

Long Term Management of Confined Disposal Facilities for Dredged Material

Long Term Management of Confined Disposal Facilities for Dredged Material
Author:
Publisher: PIANC
Total Pages: 30
Release: 2009
Genre: Dredging spoil
ISBN: 2872231781
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"During the latter part of the 20th century it became clear that another approach should be found for handling contaminated dredged material. Up to then it was common practise to dispose dredged material at sea or use it to raise the land or as fertilizer on land. A new approach was to store contaminated dredged material in confined disposal facilities (CDFs). These CDFs are only meant for dredged material that is heavily contaminated and cannot be relocated into the water system or used for engineering or environmental purposes. Much effort was devoted to the design of CDFs and to the assessment and management of environmental risks. Despite the fact that stricter environmental pollution controls meant that sediments in rivers and harbours became less contaminated and options for use of dredged material became more available, there still is the need for more storage capacity for contaminated dredged material arising from certain capital, environmental remediation and sometimes maintenance dredging projects. It is especially difficult to decrease the influence of diffuse sources on contamination levels of sediments."--Introduction.

First Steps Toward Achieving Disposal Area Reuse

First Steps Toward Achieving Disposal Area Reuse
Author: Raymond Lawree Montgomery
Publisher:
Total Pages: 46
Release: 1976
Genre: Dredging spoil
ISBN:
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The objectives of research on disposal area reuse are simply to develop procedures for maintaining a dredged material disposal area for an indefinite period while providing environmentally acceptable disposal operations. The reusable dredged material disposal area is a collection and processing site where valuable portions of the dredged material are made available for productive use while unusable material is, if necessary, treated and disposed of. Methods and procedures must provide for continuous or periodic removal of dredged material for use or storage elsewhere in order to increase the life expectancy of the facility. In the Mobile Bay Area, plans for expansion of disposal areas have been abandoned in some cases because of objections from local residents and environmental constraints. Thus, the need for maximizing the useful life of existing sites in this area is pressing. This paper presents results from a field study in the Mobile Bay Area outlining the first steps taken toward the development of a reusable disposal area. Plans and concepts are discussed regarding the long range planning required to maintain use of sites for indefinite periods. This paper does not present a panecea for dredged material disposal problems because it is not available now nor will it be in the future. Each reusable disposal area will have to be developed based on its own needs and local environment. (Author).

Long-Term Management Strategy for Dredged Material Disposal for Naval Facilities at Pearl Harbor, Hawaii

Long-Term Management Strategy for Dredged Material Disposal for Naval Facilities at Pearl Harbor, Hawaii
Author:
Publisher:
Total Pages: 153
Release: 2000
Genre:
ISBN:
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The Naval Station (NAVSTA), Pearl Harbor, dredges a number of locations throughout the Pearl Harbor Naval Complex (PHNC) intermittently to maintain harbor operations. Up to the present time of all of the dredged material has been disposed in the ocean. Recent testing of some sediments has indicated that some of the material is unsuitable for ocean disposal because of potential impacts from contaminants present in the sediments. This finding necessitates evaluating other disposal alternatives that are practicable, economical, and environmentally sound and have high public acceptance. These alternatives should provide disposal solutions for the next 30 years and maintain the future viability of naval operations at Pearl Harbor. Investigations of alternatives require development of a long-term management strategy (LTMS) and evaluation of the environmental effects of various disposal alternatives. This report documents Phase I of a three-phase study to develop a workable LTMS for PHNC. This report includes a review of dredging volumes and frequencies; dredging and disposal equipment and techniques; environmental resources; and capacities, costs, and logistics of potential disposal alternatives. Ten disposal alternatives, including contained aquatic disposal, upland or nearshore confined disposal, and beneficial uses alternatives, are identified for material that is unsuitable for ocean disposal. A screening evaluation of the alternatives was performed to rank the alternatives. Based on the results of this Phase I effort, it is recommended that Phase II be initiated to evaluate the Waipio Peninsula and the Reef Runway disposal alternatives.