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  • Mosquito spraying slated for tomorrow over Portsmouth

    Aerial mosquito treatment over Craney Island federal property is scheduled for tomorrow, 7 a.m. to 8 p.m. 

  • Out-of-season outage closes The Dalles Dam navigation lock

    An out-of-season outage will close The Dalles Dam’s navigation lock, Sept. 14-15, 2021. A specialized U.S. Army Corps of Engineers rope-access (climbing) inspection team will be performing an assessment, which is part of a required five-year cycle.

  • Energy savings virtual workshop sees attendance nearly double

    The workshop assists in helping the Army achieve mission effectiveness and achieve mandates imposed by laws and Department of Defense regulations by integrating energy programs, initiatives and activities.

  • NR 21-31: Corps of Engineers soliciting proposals for development of Cook Recreation Area at J. Percy Priest Lake

    NASHVILLE, Tenn. (Sept. 9, 2021) – The U.S. Army Corps of Engineers Nashville District is soliciting proposals for operation and maintenance of multipurpose recreational facilities, which include a campground and related facilities and services at the Cook Recreation Area on J. Percy Priest Lake in Hermitage, Tennessee. Proposals will be accepted through Jan. 10, 2022.

  • A call to serve: One Soldier remembers 9/11

    On Sept. 10, 2001, Maj. Jarrod Gillespie, who now serves as deputy chief of contracting at the U.S. Army Engineer Research and Development Center (ERDC), was a junior at Alcorn State University in Mississippi. He enlisted in the Army Reserves right out of high school, and while he enjoyed being a Soldier, his plan was to graduate from Alcorn State, finish his military service and begin civilian life as a culinary arts student with plans to open his own restaurant. The next day, everything changed.

  • Corps supports FEMA debris mission in Tennessee

    NASHVILLE, Tenn. (Sept. 9, 2021) – The U.S. Army Corps of Engineers is supporting a FEMA debris mission in Tennessee in the wake of devastating flash flooding when up to 17 inches of rain fell Aug. 21 in rural areas of Dickson, Hickman, Houston, and Humphreys counties.

  • USACE hosts DOE-LM at Iowa Army Ammunition Plant FUSRAP Site

    U.S. Army Corps of Engineers staffers escorted the director of the Department of Energy’s Office of Legacy Management at Iowa Army Ammunition Plant Sept. 9, 2021.

  • Shear and Tensile Delamination of Ice from Surfaces: The Ice Adhesion Peel Test (IAPT)

    ABSTRACT: For decades, researchers have sought to understand the adhesion of ice to surfaces so that low-cost ice mitigation strategies can be developed. Presently, the field of ice adhesion is still without formal standards for performing ice adhesion tests. The U.S. Army Corps Engineers’ Research and Development Center’s Cold Regions Research and Engineering Laboratory (ERDC-CRREL) has a longstanding history as an independent third party for ice adhesion testing services. Most notably, CRREL’s Zero-Degree Cone Test (ZDCT) has been an industry favorite for more than 30 years. Despite its wide acceptance, the ZDCT contains some shortcomings, namely that freshwater ice is formed on the surface of interest within the confines of an annular gap. To address this limitation, CRREL developed and uses the Ice Adhesion Peel Test (IAPT) for testing ice adhesion. This test employs an open planar substrate from which the ice can be removed under either tensile or shear loading, thereby allowing ice to be grown directly on the target substrate without the use of molds. The IAPT configuration is therefore amenable to different ice types and geometries and will provide utility to research studies that aim to develop surface treatments to mitigate ice in a wide range of environments. This report describes the IAPT and its use for characterizing the ice adhesion properties of materials.

  • Mat Sinking Unit Supply Study: Mississippi River Revetment

    Abstract: The Mississippi Valley Division (MVD) has maintained the Mississippi River banks for over 80 years. The Mat Sinking Unit (MSU), built in 1946, was considered state-of-the-art at the time. This system is still in operation today and has placed over 1,000 miles of Articulated Concrete Mats along the Mississippi River from Head of Passes, LA, to Cairo, IL. A new MSU has been designed and is expected to be fully mission capable and operational by the 2023 season, which is expected to increase the productivity from 2,000 squares/day up to 8,000 squares/day with double shifts and optimal conditions. This MSU supply study identifies and optimizes the supply chain logistics for increased production rates from the mat fields to the MSU. The production rates investigated for this effort are 2,000 squares/day, 4,000 squares/day, and 6,000 squares/day. RiskyProject® software, which utilizes a Monte Carlo method to determine a range of durations, manpower, and supplies based on logical sequencing is used for this study. The study identifies several potential supply and demand issues with the increased daily production rates. Distance to casting fields, number of barges, and square availability are the major issues to supply increased placement rates identified by this study.

  • Geophysical Investigation to Assess Condition of Grouted Scour Hole: Old River Control Complex—Low Sill Concordia Parish, Louisiana

    Abstract: Geophysical surveys, both land-based and water-borne, were conducted at the Old River Control Complex‒Low Sill, Concordia Parish, LA. The purpose of the surveys was to assess the condition of the grout within the scour region resulting from the 1973 flood event, including identification of potential voids within the grout. Information from the ground studies will also be used for calibration of subsequent marine geophysical data and used in stability analysis studies. The water-borne survey consisted of towed low frequency (16-80 MHz) ground penetrating radar (GPR), whereas the land-based surveys used electrical resistivity and seismic refraction. The GPR survey was conducted in the Old River Channel on the upstream side of the Low Sill structure. The high electrical conductivity of the water (~50 mS/m) precluded penetration of the GPR signal; thus, no useful data were obtained. The land-based surveys were performed on both northeast and southeast sides of the Low Sill structure. Both resistivity and seismic surveys identify a layered subsurface stratigraphy that corresponds, in general, with available borehole data and constructed geologic profiles. In addition, an anomalous area on the southeast side was identified that warrants future investigation and monitoring.