Port of Portland's Changes in Maintenance Dredging: Barge Unloading and the New Dredged Material Rehandling Facility

Dredging '02 ◽  
2003 ◽  
Author(s):  
Marcel Hermans ◽  
Walt Haynes ◽  
John Childs
Keyword(s):  
Dredged Material ◽  
Maintenance Dredging

scholarly journals HYDRODYNAMIC ANALYSIS OF SLUDGE DUMPED IN COASTAL WATERS

1972 ◽  
Vol 1 (13) ◽  
pp. 121
Author(s):  
Billy L. Edge
Keyword(s):  
Dredged Material ◽  
Transport Mechanisms ◽  
Environmental Pressures ◽  
Hydrodynamic Analysis ◽  
Fine Grained ◽  
Land Disposal ◽  
Physical Forces ◽  
Maintenance Dredging ◽  
Disposal Problem ◽  
Wastewater Sludges

Due to increased environmental pressures, there is a rapidly growing tendency to shift from traditional land disposal of dredged material to offshore or ocean disposal. The quantities of such materials are quite large, resulting in a very serious disposal problem. For example, maintenance dredging alone produces approximately six million cubic yards of material annually in Charleston Harbor. Existing techniques are reasonably adequate to describe the transport and settling characteristics of coarse, sandy dredge materials discharged from barges or hopper dredges at sea. However, such approaches need to be modified to describe the transport of fine-grained clay and silt materials. This material constitutes a significant portion of the dredged material resulting from both new harbor and channel construction and maintenance dredging along the coast of the Carolinas and Georgia. These fine-grained materials are subject to many additional physical forces as well as chemical phenomena, e.g., flocculation, salinity and temperature variations, etc. A hydrodynamic model for fine-grained dredged material has been developed which considers many of these forces. It is also applicable for describing the transport mechanisms associated with barge disposal of wastewater sludges from municipal and industrial sources. The results of the model indicate what discharge strategies are necessary for placing the sludge at a desired location or depth with a predetermined concentration.

scholarly journals 3D HYDRODYNAMIC MODELING TO CHARACTERISE THE BEHAVIOUR OF THE DISPOSAL OF DREDGED MATERIAL USING A VERTICAL TREMIE PIPE

2018 ◽  
pp. 26
Author(s):  
Siviwe Mabija
Keyword(s):  
Case Studies ◽  
Hydrodynamic Modeling ◽  
Dredged Material ◽  
Mixing Zone ◽  
Regulatory Standard ◽  
Form Part ◽  
Maintenance Dredging

Dredge plume modelling forms an integral part of the supporting studies for EIA applications for both capital and maintenance dredging projects. The behaviour of dredge plumes is function of many variables, many of which are unknown at the time of undertaking the studies. As such engineering judgment, previous project experience (including engaging dredging contractors) and available literature form part of the tools used to characterize the behaviour of dredge plumes. This paper summarises two case studies where underwater disposal (using a vertical tremie pipe) of dredge material from a cutter section (CSD) was simulated in order to meet the regulatory standard at the edge of mixing zone.

Advancements in the Management of Dredged Material in the State of New Jersey

2008 ◽  
Author(s):  
Douglas A. Gaffney ◽  
Edward S. Gorleski ◽  
Genevieve Boehm Clifton
Keyword(s):  
New Jersey ◽  
The State ◽  
Dredged Material

CONDITIONS FAVOURABLE FOR PROTECTION THE MARINE SHORE OF THE VISTULA SPIT AND SAMBIAN PENINSULA (THE BATIC SEA, KALININGRAD OBLAST) BY OFFSHORE DISPOSAL OF DREDGED MATERIAL

2017 ◽  
Author(s):  
Andrei Sokolov ◽  
Andrei Sokolov ◽  
Boris Chubarenko ◽  
Boris Chubarenko
Keyword(s):  
Dredged Material ◽  
Vistula Lagoon ◽  
Shore Protection ◽  
The South ◽  
The Third ◽  
Dumping Site ◽  
The North ◽  
Kaliningrad Oblast ◽  
Wind Actions ◽  
The Vistula Lagoon

Three dumping sites located at the south-eastern part of the Baltic Sea (Kaliningrad Oblast) at shallow depths are considered. The first one is located to the south of the Vistula Lagoon inlet in front of a permanently eroded open marine shore segment. The second one is located to the north of the Vistula Lagoon inlet, and is used now for disposing of dredged material extracted from the Kaliningrad Seaway Canal. The third dumping site is located near the northern shore of the Sambian Peninsula to the east of the Cape Gvardeijski and assigned for disposing the dredged material extracted from the fairway to the Pionerskij Port located nearby. The last site is planned to be used for disposing of dredged material from the future port that should be constructed there before the beginning of the FIFA World Cup 2018. All three dumping sites are located not far from the eroded segments of the shore. The question behind the study is: would it possible that disposed material will naturally transported from the damping site to the shore and accumulate there to protect it from erosion? A numerical hydrodynamic-transport 3D model (MIKE) was used to model sediment transport under different wind actions. The winds with the speed stronger than 15 m/s complete wash out disposed material from the dumping site and spreading it over the wide area with a negligible layer thickness. Winds of about 7-10 m/s transport material along the shore at a distance of few kilometers that may be useful for shore protection. The first location of the dumping site (to the south of the Vistula Lagoon inlet) looks very ineffective for potential protection the shore nearby. At the other hand, the second and especially the third locations are favorable for transport of disposed material to the shore, the most favorable conditions are at onshore or alongshore currents.

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