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Title: Literature review and technical evaluation of sediment resuspension during dredging
Authors: Texas A & M University. Center for Dredging Studies
Improvement of Operations and Maintenance Techniques Research Program (U.S.)
Herbich, John B.
Brahme, Shashikant B. (Shashikant Bhalchandra), 1933-
Keywords: Contaminated sediments
Sediment resuspension
Dredging equipment
Suspended sediments
Environmental effects
Environmental aspects
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Contract report (U.S. Army Engineer Waterways Experiment Station) ; HL-91-1.
Description: Contract Report
Abstract: Maintenance of navigable waterways is essential for continuous traffic flow. The sediments in the waterways, however, have, in many instances, become contaminated over the years, resulting in a concern that dredging and disposal of the dredged material may adversely affect water quality and aquatic life. Conventional dredges such as hopper suction dredges, cutterhead dredges, dustpan dredges, and bucket or clamshell dredges share the burden of dredging. Most dredges in the United States are old and are not designed to handle highly contaminated sediments. The present study is a literature review and technical evaluation of conventional and unconventional dredges, their dredging techniques, factors influencing the sediment resuspension characteristics associated with such dredges, the nature of improvements that have been made in such dredges to reduce their environmental impact, and further research needed in this field. This literature review indicated that all conventional dredges generate turbidity in the vicinity of the dredge to a varying degree depending on the type of dredge, the nature of sediment, and the dredging and disposal method adopted. The turbidity is usually of a short duration, and normal conditions are quickly restored. There was more turbidity in the case of open-water disposal than at the dredge itself. The turbidity was also found to be higher for fine material such as silt and clay than from coarse-grained material. The sediment resuspended by dredging may release into the water column some contaminants that affect the environment. Measures such as silt curtains are only partially successful in that these do not eliminate the impact on the benthic community along the bottom. Further research is recommended to study measures to reduce turbidity generation at the dredge. Unconventional dredging systems such as Pneuma pumps, Oozer dredges, and Mudcat dredges appear to be successful in reducing sediment resuspension but are unable to handle large quantities of material. Therefore, detailed studies are recommended to evaluate sediment resuspension by these dredges. NOTE: This file is large. Allow your browser several minutes to download the file.
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Appears in Collections:Contract Report

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