Investigating the macro-physical properties,characteristics and morphological classifications of palsas on Vaisjeaggi palsa mire in the periglacial environment of northernmost Finland.

Dolby, Emma (2006) Investigating the macro-physical properties,characteristics and morphological classifications of palsas on Vaisjeaggi palsa mire in the periglacial environment of northernmost Finland. BSc dissertation, University of Portsmouth.

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    Abstract

    In July 2005 a detailed investigation of palsas (peat mounds with a perennially frozen core) was carried out in northernmost Finnish Lapland, in an area of 20664 Sqm on Vaisjeaaggi mire, in the vicinity of the Kevo Subartic research Station. All palsa forms were electronically surveyed with a total station to give the actual positions (x, y, and z or northing, easting and elevation) of surveyed points in absolute terms. Palsas of varying geometry and thus and different developmental stages were shown to exist together. The distribution of palsa was represented using a digital terrain modelling program, Surfer8. Performing nearest neighbour analysis showed that palsas were randomly distributed across the mire, with an NNI of 1.066. A descriptive morphological classification system for palsa on Vaisjeaaggi mire and regional palsa mires was presented; the palsas can be divided into one of five classifications: Pounu-form palsa, String-form, Dome-form, Ring-form and Palsa Complex. Spatial analysis concluded palsa classifications exhibited a positive auto correlation illustrating palsas of similar attributes tend to be near each other and palsas of dissimilar attributes tend to be further away. Adhering to Walto Tobler's first law of geography, 'everything is related to everything else but nearer things are more closely related'.The investigation found that the vegetation cover of a palsa is related to the palsa height, specifically that; as palsa height increases there is an increased amount of un-vegetated bare peat areas. Soil moisture, proximity to water, vegetation cover and local topography were concluded to be the deciding factors in palsa development.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Science > Department of Geography
    Depositing User: Jane Polwin
    Date Deposited: 20 Jan 2011 12:47
    Last Modified: 28 Jan 2015 11:13
    URI: http://eprints.port.ac.uk/id/eprint/184

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