Process Study of Sorted Patterns on Arctic Soils
Patterned ground is ubiquitous in Arctic and alpine areas. To improve understanding of this phenomenon, we developed extensive field instrumentation that has been recording principal soil properties over the past four years. The resulting data constitute the first quantitative year-round records of...
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ftdtic:ADA234089 2023-05-15T14:51:08+02:00 Process Study of Sorted Patterns on Arctic Soils Hallet, Bernard Waddington, Edwin WASHINGTON UNIV SEATTLE QUATERNARY RESEARCH CENTER 1991-03-01 text/html http://www.dtic.mil/docs/citations/ADA234089 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA234089 en eng http://www.dtic.mil/docs/citations/ADA234089 Approved for public release; distribution is unlimited. DTIC AND NTIS Soil Mechanics Snow Ice and Permafrost Theoretical Mathematics *ARCTIC REGIONS BUOYANCY CIRCLES CIRCULATION DEFORMATION DETERMINANTS(MATHEMATICS) DYNAMICS FIELD EQUIPMENT FORCE(MECHANICS) FREEZING FROST HEAVE INSTRUMENTATION LAYERS LONG RANGE(TIME) MATHEMATICAL MODELS MOTION MOUNTAINS NUMERICAL ANALYSIS PATTERNS RECORDS SEASONAL VARIATIONS SOILS STOCHASTIC PROCESSES THAWING *FROZEN SOILS PATTERNED GROUND PERMAFROST SPITSBERGEN SOIL MODELS ARCTIC OCEAN ISLANDS SELF ORGANIZING SYSTEMS LPN-ARO-P-24376-GS Text 1991 ftdtic 2016-02-24T08:11:14Z Patterned ground is ubiquitous in Arctic and alpine areas. To improve understanding of this phenomenon, we developed extensive field instrumentation that has been recording principal soil properties over the past four years. The resulting data constitute the first quantitative year-round records of important seasonal process such as freezing, thawing, frost heaving, and settling in the active layer in a sorted circle area. The data provide unprecedented insight into the long-term dynamics of active sorted soil patterns. We have complemented our field research with analytical and numerical studies of sorted pattern formation. Deterministic and stochastic analyses of pattern development in the absence of significant soil deformation reveal strong textural instabilities; stones initially distributed at random through the soil tend to migrate quickly toward domains slightly richer in stones, which eventually leads to the distinct sorting characteristic of diverse forms of patterned ground. Our numerical model of sorted stripe formation successfully simulates stripe development, and sheds considerable light on formative process. We have also developed a novel model to assess buoyancy forces that arise in the thaw process, and may be responsible for the long-term circulatory soil motion documented in sorted circles in Spitsbergen. Text Arctic Arctic Ocean Ice permafrost Spitsbergen Defense Technical Information Center: DTIC Technical Reports database Arctic Arctic Ocean Stripe ENVELOPE(9.914,9.914,63.019,63.019) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Soil Mechanics Snow Ice and Permafrost Theoretical Mathematics *ARCTIC REGIONS BUOYANCY CIRCLES CIRCULATION DEFORMATION DETERMINANTS(MATHEMATICS) DYNAMICS FIELD EQUIPMENT FORCE(MECHANICS) FREEZING FROST HEAVE INSTRUMENTATION LAYERS LONG RANGE(TIME) MATHEMATICAL MODELS MOTION MOUNTAINS NUMERICAL ANALYSIS PATTERNS RECORDS SEASONAL VARIATIONS SOILS STOCHASTIC PROCESSES THAWING *FROZEN SOILS PATTERNED GROUND PERMAFROST SPITSBERGEN SOIL MODELS ARCTIC OCEAN ISLANDS SELF ORGANIZING SYSTEMS LPN-ARO-P-24376-GS |
spellingShingle |
Soil Mechanics Snow Ice and Permafrost Theoretical Mathematics *ARCTIC REGIONS BUOYANCY CIRCLES CIRCULATION DEFORMATION DETERMINANTS(MATHEMATICS) DYNAMICS FIELD EQUIPMENT FORCE(MECHANICS) FREEZING FROST HEAVE INSTRUMENTATION LAYERS LONG RANGE(TIME) MATHEMATICAL MODELS MOTION MOUNTAINS NUMERICAL ANALYSIS PATTERNS RECORDS SEASONAL VARIATIONS SOILS STOCHASTIC PROCESSES THAWING *FROZEN SOILS PATTERNED GROUND PERMAFROST SPITSBERGEN SOIL MODELS ARCTIC OCEAN ISLANDS SELF ORGANIZING SYSTEMS LPN-ARO-P-24376-GS Hallet, Bernard Waddington, Edwin Process Study of Sorted Patterns on Arctic Soils |
topic_facet |
Soil Mechanics Snow Ice and Permafrost Theoretical Mathematics *ARCTIC REGIONS BUOYANCY CIRCLES CIRCULATION DEFORMATION DETERMINANTS(MATHEMATICS) DYNAMICS FIELD EQUIPMENT FORCE(MECHANICS) FREEZING FROST HEAVE INSTRUMENTATION LAYERS LONG RANGE(TIME) MATHEMATICAL MODELS MOTION MOUNTAINS NUMERICAL ANALYSIS PATTERNS RECORDS SEASONAL VARIATIONS SOILS STOCHASTIC PROCESSES THAWING *FROZEN SOILS PATTERNED GROUND PERMAFROST SPITSBERGEN SOIL MODELS ARCTIC OCEAN ISLANDS SELF ORGANIZING SYSTEMS LPN-ARO-P-24376-GS |
description |
Patterned ground is ubiquitous in Arctic and alpine areas. To improve understanding of this phenomenon, we developed extensive field instrumentation that has been recording principal soil properties over the past four years. The resulting data constitute the first quantitative year-round records of important seasonal process such as freezing, thawing, frost heaving, and settling in the active layer in a sorted circle area. The data provide unprecedented insight into the long-term dynamics of active sorted soil patterns. We have complemented our field research with analytical and numerical studies of sorted pattern formation. Deterministic and stochastic analyses of pattern development in the absence of significant soil deformation reveal strong textural instabilities; stones initially distributed at random through the soil tend to migrate quickly toward domains slightly richer in stones, which eventually leads to the distinct sorting characteristic of diverse forms of patterned ground. Our numerical model of sorted stripe formation successfully simulates stripe development, and sheds considerable light on formative process. We have also developed a novel model to assess buoyancy forces that arise in the thaw process, and may be responsible for the long-term circulatory soil motion documented in sorted circles in Spitsbergen. |
author2 |
WASHINGTON UNIV SEATTLE QUATERNARY RESEARCH CENTER |
format |
Text |
author |
Hallet, Bernard Waddington, Edwin |
author_facet |
Hallet, Bernard Waddington, Edwin |
author_sort |
Hallet, Bernard |
title |
Process Study of Sorted Patterns on Arctic Soils |
title_short |
Process Study of Sorted Patterns on Arctic Soils |
title_full |
Process Study of Sorted Patterns on Arctic Soils |
title_fullStr |
Process Study of Sorted Patterns on Arctic Soils |
title_full_unstemmed |
Process Study of Sorted Patterns on Arctic Soils |
title_sort |
process study of sorted patterns on arctic soils |
publishDate |
1991 |
url |
http://www.dtic.mil/docs/citations/ADA234089 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA234089 |
long_lat |
ENVELOPE(9.914,9.914,63.019,63.019) |
geographic |
Arctic Arctic Ocean Stripe |
geographic_facet |
Arctic Arctic Ocean Stripe |
genre |
Arctic Arctic Ocean Ice permafrost Spitsbergen |
genre_facet |
Arctic Arctic Ocean Ice permafrost Spitsbergen |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA234089 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766322203190624256 |