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  • Partial closure of Pigeon Creek Park

    The U.S. Army Corps of Engineers has announced the immediate closure of portions of Pigeon Creek Park on Norfork Lake for road repairs.

  • Jacksonville District Leadership Development Program seeks students for a transformative Journey

    JACKSONVILLE, Fla. -- (July 11, 2024) In a world constantly changing, the need for visionary leaders has never been greater. The U.S. Army Corps of Engineers Jacksonville District’s Leadership Development Program embarks on a transformative journey that empowers Corps employees with skills, insights, and resilience to lead with purpose, drive impactful change while cultivating them to become tomorrow’s leaders.

  • Sharing Ships’ Weather Data via AIS: Concept and Results from Multiyear Observations

    Abstract: The purpose of this Coastal and Hydraulics Engineering technical note (CHETN) is to discuss the concept, demonstrations, and the initial results of multiyear proof-of-concept testing of the capability to share weather data from ships via the Automatic Identification System (AIS). Technical foundations of this process were described by Tetreault and Johnson (2020) with partial results described in Johnston et al. 2021. The updated results in this CHETN include evaluation of the efficacy of the various application-specific message (ASM) formats use to communicate the weather observations and data reception results for selected vessels that have been participating in the proof-of-concept field deployment since 2019 or later.

  • Mississippi River AdH Model Modification and Evaluation, Thebes, Illinois, to Birds Point, Missouri, Reach

    Abstract: A calibrated hydrodynamic and sediment transport model of the Upper Mississippi River, from Thebes, Illinois, to Birds Point, Missouri, was created to investigate hydraulics and sediment transport in the river channel and across the Dogtooth Island Peninsula (DIP) as the result of the Len Small levee breach. A hydrodynamic model was developed for the reach and calibrated to stage and breach outflow discharge data for the floods of 2011, 2015–2016, and 2017. The hydrodynamic model was used to investigate breach outflow discharges and shear stress distribution over the DIP. Soil and geologic maps were investigated to determine soil parameters and the long-term stability of soil formations on the DIP. The Upper Mississippi River sediment transport model was built upon the hydrodynamic model and soil mapping efforts. The sediment transport model was calibrated to the 2015 and 2017 flood events. Calibration data were limited to changes in elevation, which were then areally averaged, computed from comprehensive channel surveys and lidar data for the DIP. This model provides a solid foundation for comparing alternative measures to minimize further erosion of the DIP and for analyzing the risk of a channel cutoff occurring.

  • District schedules Craney Island mosquito treatment for July 15

    The Norfolk District, U.S. Army Corps of Engineers, has scheduled aerial mosquito treatment on July 15th, over the federal property on Craney Island.

  • Environmental DNA (eDNA) Assays for the Detection of Ridgway’s Rail (Rallus obsoletus) in the United States

    Abstract: We designed two novel environmental DNA (eDNA) assays for the detection of Ridgway’s Rail (Rallus obsoletus), and successfully validated each assay using eDNA samples collected from the species’ known distribution within the United States. These assays add to the suite of tools available for the monitoring of this rare and secretive marsh bird, and may help to further elucidate its movement patterns as well as identify important migration corridors. Observed sensitivity of the assays indicates exceptional performance, with limits of detection at ≤ 8 copies of the target eDNA fragment per reaction. Our publication adds to the growing body of literature supporting eDNA surveys as viable tools for bird monitoring endeavors.

  • Sliver Spall Mitigation: Field Investigation, Laboratory Study, and Mixture Proportioning Analysis

    Abstract: A combined field and laboratory study was conducted to identify factors contributing to sliver spall of concrete pavements and recommend avenues for prevention. In this study, spall density maps of eight airfields were created, and cores were taken for petrographic analysis. A companion laboratory study evaluated nondestructive testing equipment for identifying concrete prone to sliver spalling. Concrete mix designs with good and poor performance were analyzed for trends in mixture proportioning and aggregate gradation. Spall density mapping indicated sliver spalling was more likely to occur on longitudinal joints and that the distress was not solely a material or mixture design-related issue. The laboratory study concluded that surface resistivity measurements were able to differentiate edge-finishing techniques (normal versus overworked, mortar-rich edge) after seven days of curing. An analysis of particle packing theory and mixture proportioning trends showed there was substantial overlap in the gradations for good and poor performing pavement. Thus, acceptable mixture designs can produce poor quality pavement if not constructed properly. The main contributors to early age sliver spalling of concrete airfield pavement occur during pavement construction.

  • Composite Material Applications and Research Roadmap for US Army Corps of Engineers Civil Works

    Abstract: This report discusses and ranks the remaining research, development, and deployment opportunities for fiber-reinforced polymer composite materials in USACE marine infrastructure applications. Following the successes of at least 10 fiber-reinforced polymer composite pilot projects from 2015 to 2022, Public Law 117-58, the Infrastructure Investment and Jobs Act, allocated funding for a roadmap report that articulates lingering implementation barriers and prioritizes steps to overcome those challenges through laboratory and field experimentation. The objective analysis herein draws from real Operational Condition Assessment data generated in the field. Key opportunities lie in inspection techniques, standardized design approaches for molded components, and improved guidance to ad-dress abrasion, fatigue, and concentrated load cases at the 10-meter scale.

  • Energy experts converge for annual energy efficiency workshop

    This year’s workshop emphasized the benefits of collaboration between the Department of Energy’s (DOE) Federal Energy Management Program (FEMP)and the U.S. Army Corps of Engineers (USACE).

  • Pulling a Rescue Out of a Recovery

    It was a beautiful Texas summer day in June, with the sun shining brightly and waves crashing gently against the shore of Stillhouse Hollow Lake. A group of friends decided to beat the heat with a mid-day swim and entered one of the many parks closed due to excessive flood waters.