Environmental factors affecting the occurrence of periglacial landforms in Finnish Lapland : a numerical approach

Determination of the environmental factors controlling earth surface processes and landform patterns is one of the central themes in physical geography. However, the identification of the main drivers of the geomorphological phenomena is often challenging. Novel spatial analysis and modelling method...

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Main Author: Hjort, Jan
Other Authors: Murton, Julian, University of Helsinki, Faculty of Science, Department of Geography, Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, maantieteen laitos, Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, geografiska institutionen, Seppälä, Matti, Luoto, Miska
Format: Doctoral or Postdoctoral Thesis
Language:English
Published: Helsingin yliopisto 2010
Subjects:
Online Access:http://hdl.handle.net/10138/21195
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spelling ftunivhelsihelda:oai:helda.helsinki.fi:10138/21195 2023-08-20T04:10:03+02:00 Environmental factors affecting the occurrence of periglacial landforms in Finnish Lapland : a numerical approach Hjort, Jan Murton, Julian University of Helsinki, Faculty of Science, Department of Geography Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, maantieteen laitos Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, geografiska institutionen Seppälä, Matti Luoto, Miska 2010-11-25T12:06:35Z application/pdf http://hdl.handle.net/10138/21195 eng eng Helsingin yliopisto University of Helsinki Helsingfors universitet Aachen: Shaker Verlag, 2006, Berichte aus der Geowissenschaft. 0945-0777 URN:ISBN:3-8322-5008-5 http://hdl.handle.net/10138/21195 URN:ISBN:952-10-3080-1 Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. maantiede Text Doctoral dissertation (monograph) Monografiaväitöskirja Monografiavhandling doctoralThesis 2010 ftunivhelsihelda 2023-07-28T06:26:46Z Determination of the environmental factors controlling earth surface processes and landform patterns is one of the central themes in physical geography. However, the identification of the main drivers of the geomorphological phenomena is often challenging. Novel spatial analysis and modelling methods could provide new insights into the process-environment relationships. The objective of this research was to map and quantitatively analyse the occurrence of cryogenic phenomena in subarctic Finland. More precisely, utilising a grid-based approach the distribution and abundance of periglacial landforms were modelled to identify important landscape scale environmental factors. The study was performed using a comprehensive empirical data set of periglacial landforms from an area of 600 km2 at a 25-ha resolution. The utilised statistical methods were generalized linear modelling (GLM) and hierarchical partitioning (HP). GLMs were used to produce distribution and abundance models and HP to reveal independently the most likely causal variables. The GLM models were assessed utilising statistical evaluation measures, prediction maps, field observations and the results of HP analyses. A total of 40 different landform types and subtypes were identified. Topographical, soil property and vegetation variables were the primary correlates for the occurrence and cover of active periglacial landforms on the landscape scale. In the model evaluation, most of the GLMs were shown to be robust although the explanation power, prediction ability as well as the selected explanatory variables varied between the models. The great potential of the combination of a spatial grid system, terrain data and novel statistical techniques to map the occurrence of periglacial landforms was demonstrated in this study. GLM proved to be a useful modelling framework for testing the shapes of the response functions and significances of the environmental variables and the HP method helped to make better deductions of the important factors of earth surface ... Doctoral or Postdoctoral Thesis Subarctic Lapland Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto
institution Open Polar
collection Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto
op_collection_id ftunivhelsihelda
language English
topic maantiede
spellingShingle maantiede
Hjort, Jan
Environmental factors affecting the occurrence of periglacial landforms in Finnish Lapland : a numerical approach
topic_facet maantiede
description Determination of the environmental factors controlling earth surface processes and landform patterns is one of the central themes in physical geography. However, the identification of the main drivers of the geomorphological phenomena is often challenging. Novel spatial analysis and modelling methods could provide new insights into the process-environment relationships. The objective of this research was to map and quantitatively analyse the occurrence of cryogenic phenomena in subarctic Finland. More precisely, utilising a grid-based approach the distribution and abundance of periglacial landforms were modelled to identify important landscape scale environmental factors. The study was performed using a comprehensive empirical data set of periglacial landforms from an area of 600 km2 at a 25-ha resolution. The utilised statistical methods were generalized linear modelling (GLM) and hierarchical partitioning (HP). GLMs were used to produce distribution and abundance models and HP to reveal independently the most likely causal variables. The GLM models were assessed utilising statistical evaluation measures, prediction maps, field observations and the results of HP analyses. A total of 40 different landform types and subtypes were identified. Topographical, soil property and vegetation variables were the primary correlates for the occurrence and cover of active periglacial landforms on the landscape scale. In the model evaluation, most of the GLMs were shown to be robust although the explanation power, prediction ability as well as the selected explanatory variables varied between the models. The great potential of the combination of a spatial grid system, terrain data and novel statistical techniques to map the occurrence of periglacial landforms was demonstrated in this study. GLM proved to be a useful modelling framework for testing the shapes of the response functions and significances of the environmental variables and the HP method helped to make better deductions of the important factors of earth surface ...
author2 Murton, Julian
University of Helsinki, Faculty of Science, Department of Geography
Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, maantieteen laitos
Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, geografiska institutionen
Seppälä, Matti
Luoto, Miska
format Doctoral or Postdoctoral Thesis
author Hjort, Jan
author_facet Hjort, Jan
author_sort Hjort, Jan
title Environmental factors affecting the occurrence of periglacial landforms in Finnish Lapland : a numerical approach
title_short Environmental factors affecting the occurrence of periglacial landforms in Finnish Lapland : a numerical approach
title_full Environmental factors affecting the occurrence of periglacial landforms in Finnish Lapland : a numerical approach
title_fullStr Environmental factors affecting the occurrence of periglacial landforms in Finnish Lapland : a numerical approach
title_full_unstemmed Environmental factors affecting the occurrence of periglacial landforms in Finnish Lapland : a numerical approach
title_sort environmental factors affecting the occurrence of periglacial landforms in finnish lapland : a numerical approach
publisher Helsingin yliopisto
publishDate 2010
url http://hdl.handle.net/10138/21195
genre Subarctic
Lapland
genre_facet Subarctic
Lapland
op_relation Aachen: Shaker Verlag, 2006, Berichte aus der Geowissenschaft. 0945-0777
URN:ISBN:3-8322-5008-5
http://hdl.handle.net/10138/21195
URN:ISBN:952-10-3080-1
op_rights Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty.
This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.
Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden.
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