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Browsing by Author "Wing, Cornelia"

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    Evaluating Greenery in Urban Typologies - A Study with a Mixed Method Approach in Gothenburg , Sweden
    (2021-06-14) Wing, Cornelia; University of Gothenburg/Department of Earth Sciences; Göteborgs universitet/Institutionen för geovetenskaper
    A growing number of cities are experiencing challenges with adapting to stresses originating from a changing climate, such as an increase in air temperature and extreme weather events, where urban greenery has shown mitigating qualities. Apart from offering a strategy for climate mitigation and adaptation, added greenery in cities can also contribute to a large variety of ecosystem services, where qualities for human wellbeing are enhanced. To understand the spatial distribution of greenery in cities, a few studies have connected urban greenery with urban structure, but detailed data of greenery on a neighborhood scale is still limited, where more research is needed to better understand the interurban differences in qualities of greenery. This study uses a mixed method approach of spatial analysis, detailed mapping of greenery and interviews with urban planners to scrutinize the composition of greenery in urban typologies in Gothenburg, Sweden and the strengths and challenges related to these compositions. The chosen typologies were based on how Swedish planning ideals have been implemented in Gothenburg and consisted of the typologies; Mixed City, Million program, Nordic functionalism and Traditional neighborhood city. The results showed that the Million program and the Nordic functionalism typology consisted of a large share of vegetation which is a strength in relation to heat stress mitigation, since vegetation can provide shade and a cooling effect. The Mixed city and the Traditional neighborhood city were instead composed of highly designed dense environments with less vegetation, where space and good growing conditions for vegetation was limited. This variety in compositions of greenery creates different starting points for the typologies in offering heat stress mitigation, as well as other services, where the knowledge of this distribution can contribute to a more effective implementation of greenery.
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    Kartläggning av palsars inre struktur med hjälp av georadarteknik, i Vissátvuopmi, Sverige
    (2019-10-30) Cederbrant, Julia; Wing, Cornelia; University of Gothenburg/Department of Earth Sciences; Göteborgs universitet/Institutionen för geovetenskaper
    Palsas are unique features limited to the boundaries of the Arctic, where a frozen core through ice segregation and buoyancy forces an uplift in peat mires. The area of palsas in the world is decreasing and the EU has named palsa mires one of the most threatened environments. To fully understand the connection between degradation of palsas and climate change, more documentation of the inner structure is needed. The aim of this project is to investigate the inner structure of palsas and their degradation in Vissátvuopmi through ground penetrating radar (GPR). Antennas with different MHz frequencies are used to evaluate how layers in two selected palsas appear and with which frequency they are distinguishable. Previous research has been using only one antenna which have led to limitations in the interpretation of the materials. Radargrams along several profiles on the palsas were created through the GPR investigation and interpreted in two steps. Reflectors were marked on the radargram and an interpretation was made based upon previous research and knowledge about the area. Layers of snow, peat, silty glaciolacustrine sediments, ice lenses, morain, ground frost and permafrost were visible in the radargrams depending on the resolution of the antenna. The antenna with 800 MHz showed snow and peat in a good way but to clearly see the inner structure of a palsa a combination of 500 MHz and 250 MHz is favorable. The GPR survey combined with degradational patterns showed that the two palsas are in a mature stage where they have begun to collapse. The two palsas have been degraded at a faster pace than other palsas in Vissátvuopmi where the palsa plateau have been slightly more degraded and in a faster pace than the palsa dome. In a disadvantageous climate for palsa formation, palsas are at risk of disappearing in the future.

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