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  • Environmental Applications of 3D Printing Polymer Composites for Dredging Operations

    Abstract: This Dredging Operations Environmental Research (DOER) technical note disseminates novel methods to monitor and reduce contaminant mobility and bioavailability in water, sediments, and soils. These method advancements are enabled by additive manufacturing (i.e., three-dimensional [3D] printing) to deploy and retrieve materials that adsorb contaminants that are traditionally applied as unbound powders. Examples of sorbents added as amendments for remediation of contaminated sediments include activated carbon, biochar, biopolymers, zeolite, and sand caps. Figure 1 provides examples of sorbent and photocatalytic particles successfully compounded and 3D printed using polylactic acid as a binder. Additional adsorptive materials may be applicable and photocatalytic materials (Friedmann et al. 2019) may be applied to degrade contaminants of concern into less hazardous forms. This technical note further describes opportunities for U.S. Army Corps of Engineers (USACE) project managers and the water and sediment resource management community to apply 3D printing of polymers containing adsorptive filler materials as a prototyping tool and as an on-site, on-demand manufacturing capability to remediate and monitor contaminants in the environment. This research was funded by DOER project 19-13, titled “3D Printed Design for Remediation and Monitoring of Dredged Material.”
  • Poplar Island Ecosystem Restoration Expansion Complete, Open to accept Dredge Material

    The U.S. Army Corps of Engineers, Baltimore District, completed construction of the Poplar Island Ecosystem Restoration Project lateral expansion Jan. 20, 2021, providing 575 additional acres, including four new wetland cells and one large upland cell. The project is now able to accept dredged material associated with the approach channels to the Port of Baltimore until around 2032.
  • U.S. Army Corps of Engineers tests artificial-intelligence tool for monitoring water quality and oceanographic conditions at Port Everglades

    Large-scale coastal dredging projects have the potential to add stress to coral reef communities in surrounding areas, especially if impacts are undetected or fail to be detected in time.
  • Army Corps of Engineers receives additional $56 million for projects in Chesapeake Bay region

    The U.S. Army Corps of Engineers, Baltimore District, received an additional $56.02 million boost
  • Army Corps issues advisory for New Jersey Intracoastal Waterway dredging

    The U.S. Army Corps of Engineers’ Philadelphia District has issued an advisory regarding upcoming dredging along the New Jersey Intracoastal Waterway.
  • Incorporating Color Change Propensity into Dredged Material Management to Increase Beneficial Use Opportunities

    Dredged materials provide a number of beneficial use opportunities, including beach nourishment, habitat creation and restoration, and other activities. In situ sediment color is important for determining aesthetic and habitat suitability, for beach nourishment, and for other projects. However, dredged materials must meet locally established color compatibility requirements (for example, material cannot be too dark). Often, potential sediment sources are close to meeting specified color thresholds, and previous observations suggest that sediments lighten over time. In response to these observations, this study quantified sediment color change potential in a dredged m material management context. Results indicate that dredged material sediment color responded to changes in secondary color components, sediment mixing, and photolytic bleaching improving the sediment color for beneficial use application. Findings allowed for development of a conceptual color change capacity framework and supported development of tools for resource managers to incorporate color change dynamic into planning and operations activities. The following report provides a framework for determining the color change capacity of dredged materials using (1) a comprehensive laboratory approach and (2) a semiquantitative index based on source material and placement location conditions. These tools allow practitioners to incorporate dredged-material color change into resource management decisions, thus increasing beneficial use opportunities.
  • Critical study to help Port of Baltimore meet vessel needs

    With its existing 50-foot deep channel and Neo-Panamax cranes, the Port of Baltimore is already able to accommodate some of the largest container ships in the world, and has experienced significant growth in containers in recent years. Baltimore District is teaming up with the Maryland Port Administration to ensure future capacity needs are met.
  • Corps of Engineers to start Grays Harbor maintenance dredging

    The U.S. Army Corps of Engineers will begin maintenance dredging of the federal Grays Harbor Inner Harbor Navigation Channel January 4, 2021.
  • Final harbor deepening contracts awarded

    This September, the U.S. Army Corps of Engineers, Charleston District awarded the final two dredging
  • U.S. Army Engineer Research and Development Center assists Kansas City Corps with hydrodynamic dredge

    In a demonstration of collaboration and innovation, the U.S. Army Engineer Research and Development Center deployed an experimental asset and team of experts to the Missouri River in the Kansas City District, U.S. Army Corps of Engineers, to assist in dredging shallow areas called shoals in the navigation river channel.