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  • Hydraulic Sorting of Dredged Sediment in a Pipeline: An Evaluation of the Sediment Distribution Pipe

    Abstract: The US Army Corps of Engineers (USACE) recently established a goal to beneficially use 70% of material dredged from the nation’s navigable waterways by the year 2030. Most of the sediments dredged by the USACE are heterogeneous mixtures of mud and sand, which can limit beneficial use of dredged material (BUDM) applications. Innovative technologies that can sort material during the dredging process are needed to help increase BUDM practices. This investigation sought to evaluate the ability of a sediment distribution pipe (SDP) to sort particles during transport in a pipeline. Field demonstrations were conducted during dredged material placements at Sturgeon Island, New Jersey. Velocity within the pipeline was found to be inadequate for efficient hydraulic sorting of fines (<75 μm) and produced inconclusive results. Small scale laboratory SDP experiments found that effluent from the SDP holes had an altered sediment texture compared to the initial slurry and that hydraulic sorting was occurring within the pipeline. However, outflow from the SDP holes was inconsistent, and typically >90% of the sediment mass was discharged out the end of the pipeline. Sorting efficiency of the SDP could not be accurately assessed in the current experimental configuration.
  • ERDC researchers assess time-of-year restrictions for James River dredging

    Researchers at the U.S. Army Engineer Research and Development Center’s (ERDC) Environmental Laboratory (EL) are conducting field studies along the lower James River in Virginia to assess the environmental impacts of dredging and if they continue to justify the existing time-of-year restrictions (TOYR) for dredging in the area.
  • Dredging project on track at Solana Beach

    The U.S. Army Corps of Engineers Los Angeles District's dredging operations and sand replenishment project at Solana Beach is about halfway complete.
  • USACE, Newport News Set Date to Begin Deep Creek Navigation Channel Dredging

    In partnership with the City of Newport News, the U.S. Army Corps of Engineers Norfolk District has set a date to begin dredging the Deep Creek Navigation Channel.
  • Deputy commander stresses value of onsite visits to better support employees

    Los Angeles District deputy commander Lt. Col. Stephen Brooks met Jan. 9 with the district’s project-delivery team managing dredging operations at Marina del Rey Harbor and partners from LA County to see the work in action.
  • Maintenance dredging of Marina del Rey harbor underway

    Maintenance dredging of the Marina del Rey Harbor entrance channel is underway and is scheduled to be complete in May.
  • Shallow water strategic placement pilot project kicks off in San Francisco Bay

    A steady stream of scows began arriving the morning of Dec. 6 just off the coast of Eden Landing, a 6,400-acre ecological reserve located along the eastern shore of San Francisco Bay, depositing nutrient-rich dredge material in the shallow Bay waters about one mile from its tidal marshes. The daily operation, which wrapped up Dec. 31, is part of a $3.6 million shallow water strategic placement pilot project spearheaded by the U.S. Army Corps of Engineers San Francisco District, California State Coastal Conservancy (non-federal project proponent), and monitored by the U.S. Geological Survey. Sediment has a very important role to play in preparing the Bay Area for sea level rise, storm surge and other impacts of climate change. Beneficially using dredged sediment to help the bay's wetlands accrete is an effective and cost-efficient way to maintain these habitats that sustain wildlife and provide critical flood defenses.
  • Corps of Engineers to begin Duwamish River dredging

    Dredging two sections of the Duwamish River federal navigation channel will begin Jan. 2, 2024.
  • U.S. Army Corps of Engineers, Baltimore District demonstrates excellence in FY24, celebrates record-breaking 2023 achievements

    Restoration to the Chesapeake’s ecosystem, flood risk management, dredging and navigation improvement, and water supply to Washington, D.C. and Virginia residents continue at the top of the list as USACE, Baltimore District priorities in fiscal year 2024.
  • Corps of Engineers to complete $29 million in Baltimore Harbor and Channels dredging

    The U.S. Army Corps of Engineers (USACE), Baltimore District, awarded a $29.1 million contract to