Continuous microgravity monitoring of the Þeistareykir geothermal field (North Iceland)

In my doctoral thesis, I examine continuous gravity measurements for monitoring of the geothermal site at Þeistareykir in North Iceland. With the help of high-precision superconducting gravity meters (iGravs), I investigate underground mass changes that are caused by operation of the geothermal powe...

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Bibliographic Details
Main Author: Forster, F.
Format: Doctoral or Postdoctoral Thesis
Language:unknown
Published: Universität Potsdam 2022
Subjects:
Online Access:https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015331
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spelling ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5015331 2023-05-15T16:46:58+02:00 Continuous microgravity monitoring of the Þeistareykir geothermal field (North Iceland) Kontinuierliche Schweremessungen zum Monitoring des Geothermalfeldes Þeistareykir (Nordisland) Forster, F. 2022 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015331 unknown Universität Potsdam info:eu-repo/semantics/altIdentifier/doi/10.25932/publishup-54851 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015331 info:eu-repo/semantics/doctoralThesis 2022 ftgfzpotsdam https://doi.org/10.25932/publishup-54851 2023-02-13T00:33:47Z In my doctoral thesis, I examine continuous gravity measurements for monitoring of the geothermal site at Þeistareykir in North Iceland. With the help of high-precision superconducting gravity meters (iGravs), I investigate underground mass changes that are caused by operation of the geothermal power plant (i.e. by extraction of hot water and reinjection of cold water). The overall goal of this research project is to make a statement about the sustainable use of the geothermal reservoir, from which also the Icelandic energy supplier and power plant operator Landsvirkjun should benefit. As a first step, for investigating the performance and measurement stability of the gravity meters, in summer 2017, I performed comparative measurements at the gravimetric observatory J9 in Strasbourg. From the three-month gravity time series, I examined calibration, noise and drift behaviour of the iGravs in comparison to stable long-term time series of the observatory superconducting gravity meters. After preparatory work in Iceland (setup of gravity stations, additional measuring equipment and infrastructure, discussions with Landsvirkjun and meetings with the Icelandic partner institute ISOR), gravity monitoring at Þeistareykir was started in December 2017. With the help of the iGrav records of the initial 18 months after start of measurements, I carried out the same investigations (on calibration, noise and drift behaviour) as in J9 to understand how the transport of the superconducting gravity meters to Iceland may influence instrumental parameters. In the further course of this work, I focus on modelling and reduction of local gravity contributions at Þeistareykir. These comprise additional mass changes due to rain, snowfall and vertical surface displacements that superimpose onto the geothermal signal of the gravity measurements. For this purpose, I used data sets from additional monitoring sensors that are installed at each gravity station and adapted scripts for hydro-gravitational modelling. The third part of my thesis ... Doctoral or Postdoctoral Thesis Iceland GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Þeistareykir ENVELOPE(-16.951,-16.951,65.880,65.880)
institution Open Polar
collection GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
op_collection_id ftgfzpotsdam
language unknown
description In my doctoral thesis, I examine continuous gravity measurements for monitoring of the geothermal site at Þeistareykir in North Iceland. With the help of high-precision superconducting gravity meters (iGravs), I investigate underground mass changes that are caused by operation of the geothermal power plant (i.e. by extraction of hot water and reinjection of cold water). The overall goal of this research project is to make a statement about the sustainable use of the geothermal reservoir, from which also the Icelandic energy supplier and power plant operator Landsvirkjun should benefit. As a first step, for investigating the performance and measurement stability of the gravity meters, in summer 2017, I performed comparative measurements at the gravimetric observatory J9 in Strasbourg. From the three-month gravity time series, I examined calibration, noise and drift behaviour of the iGravs in comparison to stable long-term time series of the observatory superconducting gravity meters. After preparatory work in Iceland (setup of gravity stations, additional measuring equipment and infrastructure, discussions with Landsvirkjun and meetings with the Icelandic partner institute ISOR), gravity monitoring at Þeistareykir was started in December 2017. With the help of the iGrav records of the initial 18 months after start of measurements, I carried out the same investigations (on calibration, noise and drift behaviour) as in J9 to understand how the transport of the superconducting gravity meters to Iceland may influence instrumental parameters. In the further course of this work, I focus on modelling and reduction of local gravity contributions at Þeistareykir. These comprise additional mass changes due to rain, snowfall and vertical surface displacements that superimpose onto the geothermal signal of the gravity measurements. For this purpose, I used data sets from additional monitoring sensors that are installed at each gravity station and adapted scripts for hydro-gravitational modelling. The third part of my thesis ...
format Doctoral or Postdoctoral Thesis
author Forster, F.
spellingShingle Forster, F.
Continuous microgravity monitoring of the Þeistareykir geothermal field (North Iceland)
author_facet Forster, F.
author_sort Forster, F.
title Continuous microgravity monitoring of the Þeistareykir geothermal field (North Iceland)
title_short Continuous microgravity monitoring of the Þeistareykir geothermal field (North Iceland)
title_full Continuous microgravity monitoring of the Þeistareykir geothermal field (North Iceland)
title_fullStr Continuous microgravity monitoring of the Þeistareykir geothermal field (North Iceland)
title_full_unstemmed Continuous microgravity monitoring of the Þeistareykir geothermal field (North Iceland)
title_sort continuous microgravity monitoring of the þeistareykir geothermal field (north iceland)
publisher Universität Potsdam
publishDate 2022
url https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015331
long_lat ENVELOPE(-16.951,-16.951,65.880,65.880)
geographic Þeistareykir
geographic_facet Þeistareykir
genre Iceland
genre_facet Iceland
op_relation info:eu-repo/semantics/altIdentifier/doi/10.25932/publishup-54851
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015331
op_doi https://doi.org/10.25932/publishup-54851
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