Relationship of White Spruce to Lenses of Perennially Frozen Ground, Mount McKinley National Park, Alaska

ARCTIC ◽  
1965 ◽  
Vol 18 (4) ◽  
pp. 262 ◽  
Author(s):  
Leslie A. Viereck
Keyword(s):  
Snow Cover ◽  
National Park ◽  
White Spruce ◽  
Parent Material ◽  
Silty Clay ◽  
Frozen Ground ◽  
Moss Layer ◽  
Individual Trees ◽  
Relationship Of

Reports investigations of perennially frozen mounds beneath individual trees growing in silty clay on a terrace of the McKinley River. Climate, vegetation and parent material of the spruce stand are described. The mounds, 2-4 m in diam, contain a frozen lens-shaped core. The permafrost results from lower temperatures under the trees due to less snow cover and a thicker moss layer. A proposed cycle of development and collapse of the tree mounds is outlined.

From Competition to Cooperation: A History of Canada–US National Park Relations

2019 ◽  
Author(s):  
Terence Young ◽  
Alan MacEachern ◽  
Lary Dilsaver
Keyword(s):  
National Parks ◽  
National Park ◽  
The United States ◽  
The Us ◽  
Park Service ◽  
Settler Societies ◽  
History Of ◽  
Relationship Of ◽  
Flow Of Information ◽  
The Relationship

This essay explores the evolving international relationship of the two national park agencies that in 1968 began to offer joint training classes for protected-area managers from around the world. Within the British settler societies that dominated nineteenth century park-making, the United States’ National Park Service (NPS) and Canada’s National Parks Branch were the most closely linked and most frequently cooperative. Contrary to campfire myths and nationalist narratives, however, the relationship was not a one-way flow of information and motivation from the US to Canada. Indeed, the latter boasted a park bureaucracy before the NPS was established. The relationship of the two nations’ park leaders in the half century leading up to 1968 demonstrates the complexity of defining the influences on park management and its diffusion from one country to another.

Geothermal modeling of soil or mine tailings with concurrent freezing and deposition

1998 ◽  
Vol 35 (2) ◽  
pp. 234-250 ◽  
Author(s):  
JF (Derick) Nixon ◽  
Nick Holl
Keyword(s):  
Snow Cover ◽  
Mine Tailings ◽  
Frozen Soil ◽  
Freezing And Thawing ◽  
Frozen Ground ◽  
Geothermal Model ◽  
Winter Time ◽  
Upper Boundary ◽  
Good Agreement

A geothermal model is described that simulates simultaneous deposition, freezing, and thawing of mine tailings or sequentially placed layers of embankment soil. When layers of soil or mine tailings are placed during winter subfreezing conditions, frozen layers are formed in the soil profile that may persist with time. The following summer, warmer soil placement may not be sufficient to thaw out layers from the preceding winter. Remnant frozen soil layers may persist for many years or decades. The analysis is unique, as it involves a moving upper boundary and different surface snow cover functions applied in winter time. The model is calibrated based on two uranium mines in northern Saskatchewan. The Rabbit Lake scenario involves tailings growth to a height of 120 m over a period of 24 years. At Key Lake, tailings increase in height at a rate of 1.3 m/year. Good agreement between the observed position of frozen layers and those predicted by the model is obtained. Long-term predictions indicate that from 80 to 200 years would be required to thaw out the frozen layers formed during placement, assuming 1992 placement conditions continue. Deposition rates of 1.5-3 m/year give the largest amounts of frozen ground. The amount of frozen ground is sensitive to the assumed snow cover function during winter.Key words: geothermal, model, tailings, freezing, deposition.

Thermal remote sensing of snow cover to identify the extent of hydrothermal areas in Yellowstone National Park

2012 ◽  
Author(s):  
Christopher M. U. Neale ◽  
S. Sivarajan ◽  
A. Masih ◽  
C. Jaworowski ◽  
H. Heasler
Keyword(s):  
Remote Sensing ◽  
Snow Cover ◽  
Yellowstone National Park ◽  
National Park ◽  
Thermal Remote Sensing

scholarly journals Mapping the Distribution of Buried Glacier Ice – An Example From Lago Delle Locce, Monte Rosa, Italian Alps

1986 ◽  
Vol 8 ◽  
pp. 78-81 ◽  
Author(s):  
W. Haeberli ◽  
F. Epifani
Keyword(s):  
Snow Cover ◽  
Seismic Refraction ◽  
Italian Alps ◽  
Frozen Ground ◽  
Near Surface ◽  
Winter Snow ◽  
Glacier Ice ◽  
Geoelectrical Resistivity ◽  
Monte Rosa

Techniques for mapping the distribution of buried glacier ice are discussed and the results, from a study carried out within the framework of flood protection work in the Italian Alps, are presented. Bottom temperatures of the winter snow cover (BTS) primarily indicate the heat flow conditions in the underlying ground and mainly depend on the presence or absence of an ice layer beneath the surface. Determination of BTS values is therefore an inexpensive method for quickly mapping the near-surface underground ice in areas where there is 1 m or more of winter snow cover. At greater depths, and/or when more detail is required, geoelectrical resistivity soundings and seismic refraction soundings are most commonly used to investigate underground ice. A combination of the two sounding techniques allows the vertical extent and the main characteristics (frozen ground, dead glacier ice) to be determined in at least a semi-quantitative way. Complications mainly arise from irregularity in the horizontal extension of the studied underground ice bodies, and they may have to be overcome by expensive core drillings and borehole measurements. Widespread occurrence of buried glacier ice was observed in morainic deposits, surrounding an ice-dammed lake near Macugnaga, Italy.

Resistance to water uptake by Douglas-fir seedlings in soils of different texture

1980 ◽  
Vol 10 (4) ◽  
pp. 530-534 ◽  
Author(s):  
M.G. Dosskey ◽  
T. M. Ballard
Keyword(s):  
Water Uptake ◽  
Soil Water Potential ◽  
Large Contribution ◽  
Silty Clay ◽  
Silt Loam ◽  
Unsaturated Hydraulic Conductivity ◽  
Root Shrinkage ◽  
Upper Limits ◽  
Mycorrhizal Development ◽  
Relationship Of

Seedlings of Pseudotsugamenziesii (Mirb.) Franco were grown in fertilized silty clay, silt loam, and loamy sand in a growth chamber. Needle water potentials hardly changed as soil water potential, ψs, dropped to about −2.5 MPa. At ψs = −0.6 MPa, the effect of soil texture on water uptake rate was statistically significant (p = 0.01). Calculated water uptake resistance (from soil to foliage), R, was hardly affected by ψs between −0.5 and −1.0 MPa, but nearly doubled as ψs fell from −1.0 to −2.2 MPa. Plant water resistance is inferred to change relatively little over this range. Upper limits of soil resistance at ψs > −2.5 MPa, estimated (by Gardner's equation) for silt loam and silty clay, are too low to make a large contribution to R, or to the change in R with ψs, or to the large differences in average R among different textures at ψs values from −0.5 to −2.2 MPa. It is inferred that contact resistance, Rc, is large, varies significantly with ψs, and may vary with texture. Unsaturated hydraulic conductivity differences theoretically account for a relationship of Rc, with texture, and, together with possible root shrinkage, could account for a relationship of Rc, with ψs. Mycorrhizal development in these fertilized seedlings was too slight to justify consideration of hyphal resistance.

scholarly journals Bridging and Bounding Social Capital: Social Interaction Analysis of Islets Islanders in Wakatobi Marine National Park

2020 ◽  
Vol 8 (1) ◽  
pp. 30-46
Author(s):  
Taane La Ola ◽  
Nur Isiyana Wianti ◽  
Muslim Tadjuddah
Keyword(s):  
Social Capital ◽  
National Park ◽  
Interaction Analysis ◽  
Primary Data ◽  
Bonding Social Capital ◽  
Bridging Social Capital ◽  
The Social ◽  
Relationship Of ◽  
The Relationship ◽  
Depth Interviews

The purpose of this paper is to provide an overview of the differences in the strength of social capital that is bonding and bridging two community groups, namely land-dwellers and Sama Bajo boat-dwellers in three islands in Wakatobi Marine National Park. This study used a post-positivistic research paradigm, and the primary data were collected by using a questionnaire to 240 respondents who represented the group of land-dwellers and Sama Bajo boat-dwellers on the islands of Wangi-wangi, Kaledupa, and Tomia. This research was also supported by qualitative data through in-depth interviews from several informants and desk studies. The results showed that bridging social capital relations tend to be weak in the two forms of interactions between the Sama Bajo and the land-dwellers on Wangi-wangi Island and Kaledupa Island, while bridging social capital tend to be secured in Tomia Island. We found that the social context through the historical links in the past and identity played a role in the relationship of bridging social capital and bonding social capital in the three communities as an analytical unit of this research.  

scholarly journals The Development of Snow and Glacier Research in Switzerland

1948 ◽  
Vol 1 (04) ◽  
pp. 192-201 ◽  
Author(s):  
R. Haefeli
Keyword(s):  
Mechanical Properties ◽  
Snow Cover ◽  
Laboratory Experiments ◽  
Relationship Of ◽  
The Relationship ◽  
Research Institute

The evolution of snow and glacier research in Switzerland is outlined. The settling, creep, viscosity and slipping of the snow cover are discussed in detail and the relationship of these comparatively simple processes to the more complex movements in a glacier are described. The importance of further research in glacier physics in connection with the crystallographic and mechanical properties of ice is stressed; certain preliminary laboratory experiments and some subjects for further research in the field are suggested. The Great Aletsch Glacier is recommended for this owing to the proximity of the Jungfraujoch Research Institute and facilities for transport by the Jungfraujoch Railway.

scholarly journals Snow Cover Evolution in the Gran Paradiso National Park, Italian Alps, Using the Earth Observation Data Cube

Data ◽  
2019 ◽  
Vol 4 (4) ◽  
pp. 138 ◽  
Author(s):  
Charlotte Poussin ◽  
Yaniss Guigoz ◽  
Elisa Palazzi ◽  
Silvia Terzago ◽  
Bruno Chatenoux ◽  
...  
Keyword(s):  
Snow Cover ◽  
National Park ◽  
Data Cube ◽  
Observation Data ◽  
Italian Alps ◽  
Temporal Filtering ◽  
Time Series Analyses ◽  
Earth Observation Data ◽  
Gran Paradiso ◽  
Gran Paradiso National Park

Mountainous regions are particularly vulnerable to climate change, and the impacts are already extensive and observable, the implications of which go far beyond mountain boundaries and the environmental sectors. Monitoring and understanding climate and environmental changes in mountain regions is, therefore, needed. One of the key variables to study is snow cover, since it represents an essential driver of many ecological, hydrological and socioeconomic processes in mountains. As remotely sensed data can contribute to filling the gap of sparse in-situ stations in high-altitude environments, a methodology for snow cover detection through time series analyses using Landsat satellite observations stored in an Open Data Cube is described in this paper, and applied to a case study on the Gran Paradiso National Park, in the western Italian Alps. In particular, this study presents a proof of concept of the preliminary version of the snow observation from space algorithm applied to Landsat data stored in the Swiss Data Cube. Implemented in an Earth Observation Data Cube environment, the algorithm can process a large amount of remote sensing data ready for analysis and can compile all Landsat series since 1984 into one single multi-sensor dataset. Temporal filtering methodology and multi-sensors analysis allows one to considerably reduce the uncertainty in the estimation of snow cover area using high-resolution sensors. The study highlights that, despite this methodology, the lack of available cloud-free images still represents a big issue for snow cover mapping from satellite data. Though accurate mapping of snow extent below cloud cover with optical sensors still represents a challenge, spatial and temporal filtering techniques and radar imagery for future time series analyses will likely allow one to reduce the current cloud cover issue.

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