Hinzman, "Shrinking thermokarst ponds and groundwater dynamics in discontinuous permafrost
near Council, Alaska," Permafrost and Periglacial Processes, vol.
The RTF is in a zone of discontinuous permafrost
, the surrounding area is an open field that has been cleared of native vegetation for more than 60 years and consists of mostly moist silt (Shannon & Wilson, Inc., 2002).
We hypothesized that the discontinuous permafrost
region of Alaska is more at risk of thaw subsidence than the continuous permafrost region.
The other half is in in permafrost areas and troublesome discontinuous permafrost
Roads, buildings and other infrastructure in discontinuous permafrost
, which tends to be warmer, and along the Arctic coast, where salt content means small temperature changes can turn ice to ground water, are most vulnerable to damage.
The land itself is usually discontinuous permafrost
, and cutting a seismic line with a bulldozer scars it permanently.
Riverbank erosion, discontinuous permafrost
and ground drainage contribute to a fragile, unstable and a slowly disappearing land base that creates major challenges--and demands making choices and assigning priorities--to protecting the architectural and archaeological heritage of York Factory.
There are several types of permafrost: continuous permafrost, where the average yearly temperature is below 23[degrees]F (-5[degrees]C), discontinuous permafrost
, where it is between 23[degrees]F and 28[degrees]F (-5[degrees]C and -2[degrees]C), and sporadic permafrost, if it is always above 28[degrees]F (-2[degrees]C).
Much of this summer's field work and office analysis is aimed at better identifying soil conditions, terrain, hillsides, vegetation, geology, safety, and environmental concerns as Alaska LNG continues to make decisions not only on waterbody crossings but also pipeline specifications to match different ground conditions such as discontinuous permafrost
that would put additional stress on sections of pipe.