Topic
Dredging
About: Dredging is a research topic. Over the lifetime, 3300 publications have been published within this topic receiving 28325 citations.
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TL;DR: Dredging in this system may have led to the loss or reduction in area of a specific type of habitat in the estuary with implications for overall patterns of biodiversity and ecosystem function.
31 citations
TL;DR: There is a monetary value in dredged materials, in terms of metal content, and that the materials can potentially be used for metal extraction, and it is shown that metal recovery may become more profitable, as technologies are improved, and due to probable increases in metal prices and landfill costs.
31 citations
01 Aug 1978
TL;DR: In this article, the authors synthesize the results of eight contract research studies and summarizes the available literature concerned with turbidity generation by different types of dredging operations and evaluate methods for controlling this dispersion.
Abstract: : In response to the concern over the potential impact of dredged Material dispersion, Task 6C of the Dredged material Research Program was established to develop the capability for predicting the nature, degree, and extent of dredged material dispersion in the vicinity of dredging and open-water pipeline disposal operations. In addition, methods for controlling this dispersion were evaluated. This report synthesizes the results of eight contract research studies and summarizes the available literature concerned with turbidity generation by different types of dredging operations. Water-column turbidity generated by dredging operations is usually restricted to the vicinity of the operation and decreases rapidly with increasing distance from the operation due to settling and horizontal dispersion of the suspended material. Turbidity levels around dredging operations can be reduced by improving existing cutterhead dredging equipment and operational techniques, using watertight buckets, and eliminating hopper dredge overflow or using a submerged overflow system. During open-water pipeline disposal of fine-grained dredged material slurry, 97 to 99 percent of the material descends rapidly to the bottom of the disposal area where it forms a low gradient fluid mud mound. The relative degree of dredged material dispersion at open-water pipeline disposal operations can be best controlled by using different discharge configurations. Water-column turbidity can be all but eliminated by using a submerged diffuser system at the end of the pipeline.
31 citations
TL;DR: In this article, the authors used spatial statistics to study variability within contaminated sediments of three zones in Lake Ketelmeer in the Netherlands, focusing on the copper (Cu) and benzo(A)pyrene (BAP) content of the contaminated layer, its thickness, and related clay and organic matter (OM) contents.
Abstract: We used spatial statistics to study variability within contaminated sediments of three zones in Lake Ketelmeer in the Netherlands. Attention focused on the copper (Cu) and benzo(A)pyrene (BAP) content of the contaminated layer, its thickness, and related clay and organic matter (OM) contents. Optimal sampling distances for monitoring aquatic pollutants and the thickness of the contaminated layer in the sediments were estimated taking spatial variability into account. These distances depend on water depth, sedimentation, erosion, shipping activities, and types of sediment. In 40% of the study area, the thickness of the contaminated layer can be surveyed at a grid spacing that is 18 times as wide as that needed in harbors, near shores, and shipping routes to achieve the same accuracy. A new optimizing and cost-effective method for accurate aquatic monitoring is suggested as a preliminary step to the removal of contaminants in the future.
31 citations
TL;DR: In this paper, a method is described for estimating both direct and indirect effects of dredging on shoreline change, where the direct effect results from infilling of the dredged pit via cross-shore sediment transport and is addressed statistically, assuming that the beach profile is in some arbitrary equilibrium shape.
Abstract: Nearshore dredging for construction aggregate or beach nourishment can result in a perturbation of natural littoral processes, changes in wave transformation patterns, and a net loss of sand from the littoral system. A method is described for estimating both direct and indirect effects of dredging on shoreline change. The direct effect results from infilling of the dredged pit via cross-shore sediment transport and is addressed statistically, assuming that the beach profile is in some arbitrary equilibrium shape. The indirect effect arises from project-induced wave transformation, which alters longshore sediment transport patterns, and is described using both spectral and monochromatic, numerical wave transformation models to provide input to a one-line model for shoreline change. Infilling of the pit is neglected when estimating the indirect effect, providing a worst-case estimate of the indirect effect. The methodology is applied to a site on the Turkish Black Sea coast, using hindcast wave data. The influences of pit location and geometry are investigated systematically, and recommendations regarding optimum pit dimensions and locations are made.
31 citations