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  • Lewiston resident selected for prestigious award

    ST. PAUL, Minn. – The U.S. Army Corps of Engineers, Mississippi Valley Division, recently selected St. Paul District Channels and Harbors Section Supervisor and Lewiston, Minnesota, resident Steve Tapp as the division’s nominee for the national Outstanding Civilian of the Year Award.

  • PUBLICATION NOTICE: Characterization of eroded mud aggregates with the Flume Imaging Camera System (FICS) and its added value to sediment management projects

    Abstract: The goal of this technical note (TN) is to describe the functionality and added research value of the Flume Imaging Camera System (FICS), a US Army Engineer Research and Development Center (ERDC)-developed system designed to measure the size of sediment particles immediately following erosion.

  • PUBLICATION NOTIFICATION: Effect of Tropical Storms and Precipitation on Dredging Volumes: Houston-Galveston, TX, and Mayport, FL

    Abstract: This study characterizes infilling responses within dredged navigation channels to rainfall from tropical storms and hurricanes. This project created a web tool based on the methods described in this report. This report discusses the different analysis methods considered to relate storm and rainfall to dredging volumes at two pilot sites, Galveston, TX, and Mayport, FL. A comprehensive storm Impact Factor for hurricanes was developed to quantify the impact at a site based on proximity, duration, and wind speed. The methods vary based on the length and timing of periods of storms and rainfall prior to a dredge event. At Galveston, TX, when 2-year dredging volume totals were compared to hurricane activity occurring in the previous 2 years, the maximum dredging volume removed was higher after higher hurricane activity when compared to low activity periods. The average amount dredged was higher following periods of high hurricane activity. At Mayport, FL, dredging volumes were compared to hurricane activity occurring since the last dredging action took place. Similarly to Galveston, TX, the maximum dredging volume removed was higher after higher hurricane activity periods when compared to low activity periods. The average amount dredged was higher following periods of high hurricane activity.

  • PUBLICATION NOTICE: Quantification of the Flow Field around a Draghead Using a Physical Model

    Abstract: This study quantifies the hydraulic flow field around a draghead using a 1:7 scaled California and general type draghead. The flow field velocity measurements were taken with each draghead stationary and moving with a prototype speed of 2 knots. The measured velocities increased proportionally with the pumping flow rate. Measured velocities were found to be inversely proportional to the distance from the draghead. As a result, the greatest entrainment velocities for the California draghead were measured between the two visors and below the visors. The entrainment velocities laterally of the dragheads were found to increase by a factor of 2 with the addition of either a concrete or sand bed below the draghead. The measured velocities changed dramatically when the draghead was moving with a prototype speed of 2 knots. The measurement locations to the side of the dragheads did not show the presence of fluid entrainment; instead, the velocities were dominated by the forward motion and subsequent generation of a shear layer around the draghead. The velocities behind the draghead indicated the presence of a wake behind the draghead, with the fluid moving forward at velocity equivalent to or greater than the forward translation speed.

  • Cleveland Harbor stakeholders seek comment regarding Cleveland Harbor dredged material management plan

    The U.S. Army Corps of Engineers (USACE), Buffalo District and the Cleveland Harbor stakeholders have released a scoping information packet to begin a dredged material management plan for Cleveland Harbor.

  • LTC Jason Toth: USACE Buffalo District is ready to deliver

    The mission of the U.S. Army Corps of Engineers is to deliver engineering solutions for the Nation’s toughest challenges, and that is exactly what USACE Buffalo District has been doing and will continue to do for the lower watershed of lakes Erie and Ontario.

  • Multiple river dredging contracts awarded

    The U.S. Army Corps of Engineers, Detroit District, recently awarded contracts for maintenance dredging of the Detroit River, Saginaw River and St. Clair River all in Michigan. The contracts were separately awarded to Morrish-Wallace Construction Inc., of Cheboygan, Michigan, (d.b.a.) Ryba Marine Construction. These dredging projects help maintain the Great Lakes navigational channel to keep cargo moving – products like iron ore, limestone, coal and cement.

  • PUBLICATION NOTICE: Sediment Sorting by Hopper Dredging and Pump-Out Operations: Conceptual Model and Literature Review

    Abstract: Dredged sediment placed on beaches or nearshore environments is customarily evaluated for compatibility with the native beach sediment to avoid unintended impacts to economic, environmental, or recreational resources. Consequently, some state regulatory authorities establish limits upon the fine-grained content for sediment designated for placement on certain beaches and nearshore environments. Hopper dredging operations for beach and nearshore placement typically include periods of overflow, which is recognized to produce some degree of separation between the size fractions of the dredged sediment. The degree of separation and the controlling factors of separation are presently poorly known and are the subject of this research. This report provides a conceptual model of the hopper dredging and placement processes, including the relevant processes associated with hopper dredge-associated sediment dynamics, generation and transport of the overflow sediment plume, and sediment winnowing at the beach outflow. Prior research is described, and knowledge gaps are identified. Finally, a research plan to validate prior research and to address knowledge gaps is presented. An annotated bibliography of relevant literature is given in an appendix. Documentation of the planned research presented herein will appear in future publications associated with this study.

  • Corps opens public comment on Okeechobee Waterway maintenance dredging from Crossroads to St. Lucie Lock and Dam

    The U.S. Army Corps of Engineers, Jacksonville District opens public comment on the Draft Environmental Assessment (EA) and proposed Finding of No Significant Impact (FONSI) for the operation and maintenance dredging of the Okeechobee Waterway (OWW) from the intersection of the OWW and the Intracoastal Waterway (IWW), locally known as the Crossroads, to the St. Lucie Lock and Dam in Martin County, Florida. Public comment will be accepted through July 15, 2020.

  • Memphis Revetment Season in full swing

    The Memphis District Revetment season officially began this year on June 11, with District Commander Col. Zachary Miller hosting a kickoff meeting at the Ensley Engineer Yard to get things started. “Protecting the Mississippi River banks keeps the channel in place, which maintains the necessary depth and alignment that allows the thousands of tows to travel up and down the river year round,” the commander said. “Without this work, the river would shift resulting in new, shallow cutoffs that could not be safely traveled.”