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  • Development and Testing of the Sediment Distribution Pipe (SDP): A Pragmatic Tool for Wetland Nourishment

    Abstract: Standard dredging operations during thin layer placement (TLP) projects are labor intensive as crews are necessary to periodically move the outfall location, which can have lasting adverse effects on the marsh surface. In an effort to increase efficiency during TLP, a novel Sediment Distribution Pipe (SDP) system was investigated. This system offers multiple discharge points along the pipeline to increase the sediment distribution while reducing pipeline movements. An SDP Modeling Application (SDPMA) was developed to assist in the design of SDP field applications by quickly assessing the pressure and velocity inside the discharge pipe and approximating the slurry throw distances. An SDP field proof of concept was performed during a two-phase TLP on Sturgeon Island, New Jersey, in 2020. The SDPMA was shown to be an accurate method of predicting performance of the SDP. The SDP was successful at distributing dredge material across the placement site; however, further research is warranted to better quantify performance metrics.
  • 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.