scholarly journals New programme for climate monitoring at Camp Century, Greenland

2017 ◽  
pp. 57-60 ◽  
Author(s):  
William Colgan ◽  
Signe B. Andersen ◽  
Dirk Van As ◽  
Jason E. Box ◽  
Søren Gregersen
Keyword(s):  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Army Corps ◽  
Army Corps Of Engineers ◽  
Us Army ◽  
Future Goals ◽  
Climate Monitoring ◽  
The Us ◽  
History Of ◽  
The Government

Camp Century was a military base constructed by the US Army Corps of Engineers (USACE) in 1959 in the nearsurface layers of the Greenland ice sheet at 77.13°N and 61.03°W and 1910 metres above sea level (Clark 1965). The c. 55 ha base housed between 85 and 200 soldiers and was continuously occupied until 1964 (Fig.1). Camp Century primarily served as an experimental facility for the USACE to test ice-sheet construction concepts. Recent Danish scholarship has documented the political and military history of Camp Century in substantial detail (Petersen 2007; Nielsen & Nielsen 2016). To summarise, Project Iceworm, the US Army ambition to deploy offensive missiles within the ice sheet, was never realised. After three years of seasonal operation, Camp Century was finally abandoned with minimal decommissioning in 1967. The Government of Denmark has now established a GEUS-led programme for long-term climate monitoring, as well as one-time waste mapping, at Camp Century. Here, we briefly review the historical scientific activities at Camp Century and introduce the future goals of the Camp Century Climate Monitoring Programme. Finally, we discuss the challenges and outlook of climate monitoring and waste mapping at the former military site.

scholarly journals Managing High Water Levels in Florida’s Largest Lake: Lake Okeechobee

EDIS ◽  
2018 ◽  
Vol 2018 (2) ◽  
Author(s):  
Karl Havens
Keyword(s):  
High Water ◽  
Water Levels ◽  
Army Corps ◽  
Lake Okeechobee ◽  
Army Corps Of Engineers ◽  
Corps Of Engineers ◽  
Us Army ◽  
Trade Offs ◽  
The Us ◽  
History Of

This 7-page fact sheet written by Karl E. Havens and published by the Florida Sea Grant College Program, UF/IFAS Extension, provides a history of Lake Okeechobee regulation schedules and an overview of the risks, constraints, and trade-offs that the US Army Corps of Engineers must consider when deciding to release flood water from the lake. http://edis.ifas.ufl.edu/sg154

scholarly journals Difficulties Associated with Predicting Depth of Freeze or Thaw

1964 ◽  
Vol 1 (4) ◽  
pp. 215-226 ◽  
Author(s):  
W G Brown
Keyword(s):  
Theoretical Calculations ◽  
Army Corps ◽  
Army Corps Of Engineers ◽  
Corps Of Engineers ◽  
Us Army ◽  
Design Curve ◽  
Theoretical Support ◽  
The Us ◽  
Frost Penetration ◽  
Small Alteration

Calculations using the Neumann solution (as modified by Aldrich) and thermal properties of soils (obtained by Kersten) show that the frost penetration depth for the same freezing index for essentially all soils with any moisture content and for dry sand and rock varies by a factor of about 2 to 1. The extremes calculated in this way bracket the experimentally determined design curve of the US Army Corps of Engineers and give it theoretical support. The theoretical calculations and additional experimental data are used as a basis for a small alteration in the slope of the design curve. This modified design curve is recommended for field use because of (1) inherent imperfections in existing theory and (2) practical limitations to precise specification of field conditions.

Quantifying coastal system resilience for the US Army Corps of Engineers

2015 ◽  
Vol 35 (2) ◽  
pp. 196-208 ◽  
Author(s):  
Julie Dean Rosati ◽  
Katherine Flynn Touzinsky ◽  
W. Jeff Lillycrop
Keyword(s):  
Army Corps ◽  
Army Corps Of Engineers ◽  
Corps Of Engineers ◽  
Coastal System ◽  
Us Army ◽  
The Us ◽  
System Resilience

Assessment of resistance definitions used for blast analysis of unreinforced masonry walls

2017 ◽  
Vol 8 (1) ◽  
pp. 125-151 ◽  
Author(s):  
Eric M Gagnet ◽  
John M Hoemann ◽  
James S Davidson
Keyword(s):  
Unreinforced Masonry ◽  
Degree Of Freedom ◽  
Masonry Walls ◽  
Army Corps ◽  
Army Corps Of Engineers ◽  
Corps Of Engineers ◽  
Single Degree Of Freedom ◽  
Us Army ◽  
Single Degree ◽  
The Us

Over recent decades, three distinct methods have evolved that are currently being used to generate resistance functions for single-degree-of-freedom analyses of unreinforced masonry walls subjected to blast loading. The degree of differences in these resistance definitions depends on whether the wall is assumed to be simply supported or whether compression arching forces result from rotation restraint at the supports. The first method originated in the late 1960s as a result of both experimental and analytical research sponsored by the US Department of Defense. That method, referred to as the Wiehle method, is the basis of Unified Facilities Criteria 3-340-02 and other derived analytical software such as the Wall Analysis Code developed by the US Army Corps of Engineers, Engineer Research and Development Center. The second method is based on elastic mechanics and an assumed linear decay function that follows and is the basis of the widely used Single-Degree-of-Freedom Blast Effects Design Spreadsheets software distributed by the US Army Corps of Engineers, Protective Design Center. The third method is largely based on concrete and masonry behavioral theories developed by Paulay and Priestly in the early 1990s. This article systematically compares the resistance methodologies for arching and non-arching scenarios, demonstrates the implications by plugging the disparate resistance functions into blast load single-degree-of-freedom models, compares the analytical results to full-scale blast test results, and offers conclusions about the accuracy and efficacies of each method.

scholarly journals Initial survey of microplastics in bottom sediments from United States waterways

2021 ◽  
Author(s):  
Justin Wilkins ◽  
Andrew McQueen ◽  
Joshua LeMonte ◽  
Burton Suedel
Keyword(s):  
Bottom Sediments ◽  
Polymer Composition ◽  
Army Corps ◽  
Army Corps Of Engineers ◽  
Us Army ◽  
The Us ◽  
Initial Survey ◽  
Study Sites ◽  
Polymer Type ◽  
Number Of Particles

Given the reported extent of microplastics in the aquatic environment, environmentally relevant exposure information for sediments dredged by the US Army Corps of Engineers will lend context to the risks posed by this contaminant during dredging. We measured the occurrence, abundance, and polymer composition of microplastics in sediments collected from nine dredged waterways and two non-dredged reference areas. The number of particles in sediment samples ranged from 162 to 6110 particles/kg dry wt., with a mean of 1636 particles/kg dry wt. Fragments were the most prevalent shape observed among the 11 study sites (100% frequency of occurrence), followed by fibers (81%), spheres (75%), foams (38%) and films (34%). Based on analyses of chemical composition of the particles using Fourier transform infrared spectroscopy, polyethylene:propylene was the most common polymer type observed. Consistent with results presented by other investigators microplastic concentrations and polymer types in bottom sediments in this study were also aligned with the most widely used plastics worldwide.

scholarly journals Brunswick Harbor numerical model

2021 ◽  
Author(s):  
Jennifer McAlpin ◽  
Jason Lavecchia
Keyword(s):  
Army Corps ◽  
Army Corps Of Engineers ◽  
Engineer Research ◽  
Corps Of Engineers ◽  
Us Army ◽  
Navigation Channel ◽  
The Us ◽  
Model Setup ◽  
Hydraulics Laboratory ◽  
Development Center

The Brunswick area consists of many acres of estuarine and marsh environments. The US Army Corps of Engineers District, Savannah, requested that the US Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory, develop a validated Adaptive Hydraulics model and assist in using it to perform hydrodynamic modeling of proposed navigation channel modifications. The modeling results are necessary to provide data for ship simulation. The model setup and validation are presented here.

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