Modelling the Thermal Dynamics of Polygonal Soil Structures in the Permafrost of the Lena Delta, Northern Siberia
Patterned ground structures characterised by strong heterogeneities in surface and subsur- face properties are a common feature of permafrost landscapes in the Arctic. In this thesis, an existing permafrost model including conductive heat transfer and the phase change of water is extended to simulat...
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ftunivheidelb:oai:archiv.ub.uni-heidelberg.de:15966 2023-11-05T03:39:24+01:00 Modelling the Thermal Dynamics of Polygonal Soil Structures in the Permafrost of the Lena Delta, Northern Siberia Heikenfeld, Max 2013 application/pdf https://archiv.ub.uni-heidelberg.de/volltextserver/15966/ https://archiv.ub.uni-heidelberg.de/volltextserver/15966/1/MA_Max_Heikenfeld.pdf https://doi.org/10.11588/heidok.00015966 https://nbn-resolving.org/urn:nbn:de:bsz:16-heidok-159662 eng eng https://archiv.ub.uni-heidelberg.de/volltextserver/15966/1/MA_Max_Heikenfeld.pdf doi:10.11588/heidok.00015966 urn:nbn:de:bsz:16-heidok-159662 Heikenfeld, Max (2013) Modelling the Thermal Dynamics of Polygonal Soil Structures in the Permafrost of the Lena Delta, Northern Siberia. [Master's thesis] info:eu-repo/semantics/openAccess http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html 500 500 Natural sciences and mathematics 530 530 Physics 550 550 Earth sciences Master's thesis info:eu-repo/semantics/masterThesis NonPeerReviewed 2013 ftunivheidelb https://doi.org/10.11588/heidok.00015966 2023-10-10T12:06:53Z Patterned ground structures characterised by strong heterogeneities in surface and subsur- face properties are a common feature of permafrost landscapes in the Arctic. In this thesis, an existing permafrost model including conductive heat transfer and the phase change of water is extended to simulate the thermal dynamics of polygonal soil structures in an Arctic tundra wetland in Northern Siberia. A two-dimensional model formulation in cylindrical coordinates is implemented and coupled to a surface energy balance model. The model performance is assessed by a comparison with analytical solutions and field measurements of soil temperature and surface heat fluxes. The heat transfer in the soil is represented well with mean absolute deviations of up to 1 ◦ C. The coupled simulations with surface energy balance calculation represent the soil temperatures with larger deviations that can be attributed to the description of the snow cover in the model. Lateral heat fluxes in the polygon only occur during limited periods and do not have a substantial impact on the thermal dynamics of the system. Simplified one-dimensional model descriptions based on averaged soil and surface parameters show a cold bias of up to 0.7 ◦ C in the mean annual temperature of the permafrost compared with the detailed two-dimensional model. The thaw depth is simulated consistently by the models of different complexity . Master Thesis Arctic lena delta permafrost Tundra Siberia Heidelberg University: HeiDok |
institution |
Open Polar |
collection |
Heidelberg University: HeiDok |
op_collection_id |
ftunivheidelb |
language |
English |
topic |
500 500 Natural sciences and mathematics 530 530 Physics 550 550 Earth sciences |
spellingShingle |
500 500 Natural sciences and mathematics 530 530 Physics 550 550 Earth sciences Heikenfeld, Max Modelling the Thermal Dynamics of Polygonal Soil Structures in the Permafrost of the Lena Delta, Northern Siberia |
topic_facet |
500 500 Natural sciences and mathematics 530 530 Physics 550 550 Earth sciences |
description |
Patterned ground structures characterised by strong heterogeneities in surface and subsur- face properties are a common feature of permafrost landscapes in the Arctic. In this thesis, an existing permafrost model including conductive heat transfer and the phase change of water is extended to simulate the thermal dynamics of polygonal soil structures in an Arctic tundra wetland in Northern Siberia. A two-dimensional model formulation in cylindrical coordinates is implemented and coupled to a surface energy balance model. The model performance is assessed by a comparison with analytical solutions and field measurements of soil temperature and surface heat fluxes. The heat transfer in the soil is represented well with mean absolute deviations of up to 1 ◦ C. The coupled simulations with surface energy balance calculation represent the soil temperatures with larger deviations that can be attributed to the description of the snow cover in the model. Lateral heat fluxes in the polygon only occur during limited periods and do not have a substantial impact on the thermal dynamics of the system. Simplified one-dimensional model descriptions based on averaged soil and surface parameters show a cold bias of up to 0.7 ◦ C in the mean annual temperature of the permafrost compared with the detailed two-dimensional model. The thaw depth is simulated consistently by the models of different complexity . |
format |
Master Thesis |
author |
Heikenfeld, Max |
author_facet |
Heikenfeld, Max |
author_sort |
Heikenfeld, Max |
title |
Modelling the Thermal Dynamics of Polygonal Soil Structures in the Permafrost of the Lena Delta, Northern Siberia |
title_short |
Modelling the Thermal Dynamics of Polygonal Soil Structures in the Permafrost of the Lena Delta, Northern Siberia |
title_full |
Modelling the Thermal Dynamics of Polygonal Soil Structures in the Permafrost of the Lena Delta, Northern Siberia |
title_fullStr |
Modelling the Thermal Dynamics of Polygonal Soil Structures in the Permafrost of the Lena Delta, Northern Siberia |
title_full_unstemmed |
Modelling the Thermal Dynamics of Polygonal Soil Structures in the Permafrost of the Lena Delta, Northern Siberia |
title_sort |
modelling the thermal dynamics of polygonal soil structures in the permafrost of the lena delta, northern siberia |
publishDate |
2013 |
url |
https://archiv.ub.uni-heidelberg.de/volltextserver/15966/ https://archiv.ub.uni-heidelberg.de/volltextserver/15966/1/MA_Max_Heikenfeld.pdf https://doi.org/10.11588/heidok.00015966 https://nbn-resolving.org/urn:nbn:de:bsz:16-heidok-159662 |
genre |
Arctic lena delta permafrost Tundra Siberia |
genre_facet |
Arctic lena delta permafrost Tundra Siberia |
op_relation |
https://archiv.ub.uni-heidelberg.de/volltextserver/15966/1/MA_Max_Heikenfeld.pdf doi:10.11588/heidok.00015966 urn:nbn:de:bsz:16-heidok-159662 Heikenfeld, Max (2013) Modelling the Thermal Dynamics of Polygonal Soil Structures in the Permafrost of the Lena Delta, Northern Siberia. [Master's thesis] |
op_rights |
info:eu-repo/semantics/openAccess http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html |
op_doi |
https://doi.org/10.11588/heidok.00015966 |
_version_ |
1781695231075287040 |