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TECHNIQUES TO REDUCE THE SEDIMENT RESUSPENSION
CAUSED BY DREDGING
| 题名： | TECHNIQUES TO REDUCE THE SEDIMENT RESUSPENSION CAUSED BY DREDGING |
| 作者： | Gene L. Raymond |
| 关键词： | Dredging—Technique (LC) Sediments, Suspended (LC) Dredges (LC) |
| 摘要： | As part of a larger effort. under the Improvement of Operation and Maintenance Techniques Program"LO develop a method to predict the extent of sediment resuspension and contaminant release when dredging in contaminated sediment, the U. S. Army Engineer Waterways Experiment Station's Water Resources Engineering Group is conducting field studies.to evaluate new and existing dredging methods. These studies consist of efforts to determine the level of sediment resuspended by a given dredge type in a given sediment. Whenever possible, the studies are conducted such that different dredges operate under the same conditions or even in the same locations. The studies also evaluate the effects of various operational parameters on the resuspension of sediments. This paper presents the results of the first 2 years of study and includes data from both field studies and extensive literature review. Different dredge types produce different amounts of suspended sediment in different parts of the water column. Resuspensions caused by cutterhead and hopper dredges tend to remain in the lower water column, while bucket dredges increase resuspensions throughout the water column. The amount of resuspension caused by a given dredge type also depends on the operating techniques used with the dredge. Sediment resuspension can be lessened by changing operating techniques, as in the case of the cutterhead, or by modifying the equipment, such as enclosing a clamshell bucket. Special purpose dredges can also be used to reduce sediment resuspension, but their lower production rates limit their application. |
| 报告类型： | 科技报告 |
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