• Huntsville Center Facility Reduction Program best in class for feds

    Huntsville Center’s Facility Reduction Program (FRP) received Best in Class (BIC) certification from Office of Management and Budget (OMB), with the support of the Government-wide Category Management Program Management Office in 2021.
  • Lower Monumental Dam closes public dam crossing May 13 through 21

    KAHLOTUS, Wash. – Officials at Lower Monumental Lock and Dam will be closing public dam crossings May 13 through 21 to perform maintenance.
  • Application of Multi-fidelity Methods to Rotorcraft Performance Assessment

    Abstract: We present a Python-based multi-fidelity tool to estimate rotorcraft performance metrics. We use Gaussian-Process regression (GPR) methods to adaptively build a surrogate model using a small number of high-fidelity CFD points to improve estimates of performance metrics from a medium-fidelity comprehensive analysis model. To include GPR methods in our framework, we used the EmuKit Python package. Our framework adaptively chooses new high-fidelity points to run in regions where the model variance is high. These high-fidelity points are used to update the GPR model; convergence is reached when model variance is below a pre-determined level. To efficiently use our framework on large computer clusters, we implemented this in Galaxy Simulation Builder, an analysis tool that is designed to work on large parallel computing environments. The program is modular, and is designed to be agnostic to the number and names of dependent variables and to the number and identifying labels of the fidelity levels. We demonstrate our multi-fidelity modeling framework on a rotorcraft collective sweep (hover) simulation and compare the accuracy and time savings of the GPR model to that of a simulation run with CFD only.
  • Coastal Breeding Bird Phenology on the Dredged-Material Islands of the Baptiste Collette Bayou, US Army Corps of Engineers, New Orleans District, Louisiana

    Abstract: Coastal bird populations in North America have experienced significant population declines over the past four decades, and many species have become dependent upon human-made islands and other sediment-based habitats created through dredged material deposition. We monitored the breeding phenology of coastal bird populations utilizing dredged-material islands and open depositional areas in the Baptiste Collette Bayou in coastal Louisiana. Monitoring began in early May, prior to when most coastal species begin nesting, and continued through late August, when most breeding activity has ceased. Semimonthly surveys included area searches by foot and boat. Two deposition areas and one island supported large numbers of foraging, roosting, or breeding birds; surveys on these areas included using spotting scopes to identify species and count nests or young. Six islands and two open deposition areas were monitored. We also collected high-definition and lidar imagery using an uncrewed aerial system (UAS) in June, during peak nesting season. We recorded 77,474 cumulative detections of 68 species. Virtually all colonial nesting birds (terns and skimmers) nested on Gunn Island in 2021. We discuss these results in the context of dredged-material deposition by the US Army Corps of Engineers, New Orleans District, and offer recommendations for management of these areas.
  • Management Strategy for Overwintering Cyanobacteria in Sediments Contributing to Harmful Algal Blooms (HABs)

    Purpose: Cyanobacteria that cause harmful algal blooms (HABs) can overwinter in sediments as resting cells (akinetes or vegetative colonies) and contribute to seasonal bloom resurgences. However, to date there has been limited focus on management tactics specifically targeting the control of cyanobacterial sources from sediments. Targeting resting cells in sediments for preventative management may provide a viable approach to delay onset and mitigate blooms (Calomeni et al. 2022). However, there are limited resources for this novel strategy. Given the growing global impact of HABs, there is a need to develop management strategies focused on sediments as a potential source and contributor to HABs. Therefore, the objective of this report is to provide a management strategy in terms of approaches, information, and case study examples for managing overwintering cyanobacteria in sediments with the goal of mitigating seasonal HAB occurrences.
  • Block release of water scheduled to begin from Santa Rosa Reservoir May 13, 2024

    The Albuquerque District announced today that it has scheduled a block release of water from Santa Rosa Lake, N.M., to start Monday, May 13, 2024, at 8:00 am.
  • Temporary lane closure of Highway 25 across Greers Ferry Dam

    The U.S. Army Corps of Engineers is scheduling a one lane closure of the Highway 25 bridge across Greers Ferry Dam from 8 a.m. to 4 p.m. May 22-23 for routine maintenance.
  • USACE seeks public input on revised Nimrod Lake and Blue Mountain Lake Master Plans

    The U.S. Army Corps of Engineers is seeking public input on the draft Nimrod Lake and Blue Mountain Lake Master Plans and Environmental Assessments.
  • District Making Major Repairs at USMA West Point After Historic Floods

    Last summer, when a severe thunderstorm dropped several months’ worth of rain (eight inches) in just a few hours in New York’s Hudson Valley north of New York City, it triggered historic flooding resulting in landslides, flooded homes, washed out roads and all but engulfing the U.S. Military Academy at West Point, New York, where the New York District of the U.S. Army Corps of Engineers has a robust military-construction mission. Many buildings and vehicles were also damaged.
  • Huntsville Center leads first Solar Array Fire Safety Training session

    Huntsville Center is leading the effort to build more best practices and training sessions as there are limited industry standards and training currently offered regarding solar array fires.