15 Mar 2022

Army’s deputy for civil works tours newly funded projects, emphasizes tribal partnerships in Alaska

Members of the traveling party with Jaime Pinkham, principal deputy assistant secretary of the Army for civil works, witnessed this polar bear encounter near the community of Utqiagvik, formerly known as Barrow, while touring the U.S. Army Corps of Engineers – Alaska District’s Barrow Coastal Erosion Project. During the week of Feb. 21, the dignitary visited several civil works projects in the state that were recently funded by the Infrastructure Investment and Jobs Act or Disaster Relief Supplemental Appropriations Act. In total, this congressionally authorized funding will provide nearly $1 billion for civil works construction in Alaska.

21 Jul 2021

Machine Learning Analyses of Remote Sensing Measurements Establish Strong Relationships Between Vegetation and Snow Depth in the Boreal Forest of Interior Alaska

Abstract: The seasonal snowpack plays a critical role in Arctic and boreal hydrologic and ecologic processes. Though snow depth can be different from one season to another there are repeated relationships between ecotype and snowpack depth. Alterations to the seasonal snowpack, which plays a critical role in regulating wintertime soil thermal conditions, have major ramifications for near-surface permafrost. Therefore, relationships between vegetation and snowpack depth are critical for identifying how present and projected future changes in winter season processes or land cover will affect permafrost. Vegetation and snow cover areal extent can be assessed rapidly over large spatial scales with remote sensing methods, however, measuring snow depth remotely has proven difficult. This makes snow depth–vegetation relationships a potential means of assessing snowpack characteristics. In this study, we combined airborne hyperspectral and LiDAR data with machine learning methods to characterize relationships between ecotype and the end of winter snowpack depth. Our results show hyperspectral measurements account for two thirds or more of the variance in the relationship between ecotype and snow depth. An ensemble analysis of model outputs using hyperspectral and LiDAR measurements yields the strongest relationships between ecotype and snow depth. Our results can be applied across the boreal biome to model the coupling effects between vegetation and snowpack depth.

17 Apr 2020

Discovering the Mural in Permafrost

In the forests of Fox, Alaska, carved into a frozen hillside is a unique manmade 350-meter long research tunnel. Situated on a 16-acre parcel near the confluence of Goldstream and Glenn Creeks, the U.S. Army Corps of Engineers Research and Development Center’s Cold Regions Research and Engineering Laboratory’s Permafrost Tunnel Research Facility was excavated deep into a large block of discontinuous permafrost that has been going through several recent periods of expansion. The expansion project began back in 2011, taking advantage of the digging seasons when the ground is at its coldest, with an overall project goal of expanding the tunnel facility to better support ongoing and growing research and engineering needs. The most recent expansion effort, this year, has added 300-feet of new tunnel, improved 200 feet of the existing tunnel and added links between the old and new tunnel sections at several locations, to include at an interface between subsurface bedrock and overlying gravels.

24 May 2018

Corps extends Permafrost Tunnel and Mission

HANOVER, N.H. (May 4, 2018) -- In Fox, Alaska, lies hidden a unique scientific treasure, the