| Title | Ground ice in permafrost: thermokarst and hydrogeological implications |
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| Author | Wolfe, S A |
| Source | GeoOttawa 2017/GeoOttawa 2017; 2017 p. 1-8  Open
Access |
| Image |  |
| Year | 2017 |
| Alt Series | Natural Resources Canada, Contribution Series 20200390 |
| Publisher | Canadian Geotechnical Society |
| Meeting | GeoOttawa 2017; Ottawa; CA; October 1-4, 2017 |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf |
| Subjects | surficial geology/geomorphology; environmental geology; hydrogeology; Nature and Environment; Science and Technology; permafrost; ground ice; periglacial features; thermokarst; groundwater; Climate
change; permafrost thaw; cumulative effects |
| Illustrations | sketches; schematic cross-sections; satellite images |
| Program | Climate Change
Geoscience Permafrost |
| Released | 2017 10 01 |
| Abstract | This paper examines three types of ground ice occurring within permafrost. The primary purpose is to identify ground ice potential in present-day permafrost terrain and to understand the impacts that
warming will have on the cryosphere. Type 1 (formational) ice forms as permafrost aggrades into unfrozen ground and its excess ice is mainly segregated ice. Type 2 (post-formational) ice develops within permafrost and its excess ice includes wedge,
aggradational, and intrusive ice. Type 3 (relict) ice has formed or been deposited on the ground surface and later covered by sediments and its excess ice includes ice that has become buried and preserved within permafrost. Because of the nature of
their formation, occurrence, preservation potential, and effect on the land upon thawing, these ice types are important to the discussion of permafrost and hydrogeological interactions. Scenarios of thermokarst development related to the thawing of
each ice type are presented as a means to understand the implications of their presence and distribution within permafrost. |
| Summary | (Plain Language Summary, not published)
This paper examines three types of ground ice occurring within permafrost. Type 1 (formational) ice forms as permafrost aggrades into unfrozen ground and
its excess ice is mainly segregated ice. Type 2 (post-formational) ice develops within permafrost and its excess ice includes wedge, aggradational, and intrusive ice. Type 3 (relict) ice has formed or been deposited on the ground surface and later
covered by sediments and its excess ice includes ice that has become buried and preserved within permafrost. Because of the nature of their formation, occurrence, preservation potential, and effect on the land upon thawing, these ice types are
important to the discussion of permafrost and hydrogeological interactions. Scenarios of thermokarst development related to the thawing of each ice type are presented as a means to understand the implications of their presence and distribution within
permafrost. |
| GEOSCAN ID | 327179 |
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