Print Email Facebook Twitter Estimation of horizontal deformation rates based on tachymetric measurements Title Estimation of horizontal deformation rates based on tachymetric measurements: Processing measurements collected yearly in the geothermal area Bjarnarflag in North-East Iceland from 2015 to 2018 Author Tollenaar, Veronica (TU Delft Civil Engineering & Geosciences) Contributor van Leijen, F.J. (mentor) Verhagen, S. (mentor) Smal, I.V. (mentor) Degree granting institution Delft University of Technology Programme Geoscience and Remote Sensing Project Additional Thesis Date 2019-07-16 Abstract Measurements of a tachymetric network in the geothermal area of Bjarnarflag in North-East Iceland are performed during four consecutive years (2015-2018). For the yearly adjustment of the measurements an alternative iteration scheme to Baarda’s ’B-method of testing’ is proposed, because the level of significance of the F-test performed in the detection step is too large due to the large redundancy of the measurements. The proposed alternative method detects outliers and verifies the stochastic model simultaneously, resulting in 3to 4% rejected measurements per year. From the yearly solutions absolute and relative horizontal velocities are estimated. The relative velocities are significant, but have large uncertainties. Adding three years of data reduces the mean standard deviation of the estimated velocities from 2.4 mm in east-direction to 0.9 mm and 1.8 mm in north-direction to 0.8 mm. The improvement of precision can be accelerated by reevaluating the stochastic input parameters, adding more GNSS measurements and reconsidering the network design.Improved horizontal relative velocities can be used to understand the horizontal deformation patterns in the area of study due to extraction of water or steam by the geothermal powerplant, due to the instability of the benchmaks or due to natural processes. Subject TachymetryGeothermal powerplantBjarnarflagHorizontal deformationDeformation ratesTotal stationFieldwork To reference this document use: http://resolver.tudelft.nl/uuid:bf331eab-40c8-401e-98db-06521891a78d Part of collection Student theses Document type student report Rights © 2019 Veronica Tollenaar Files PDF AdditionalThesis_Veronica ... aar_v3.pdf 9.25 MB Close viewer /islandora/object/uuid:bf331eab-40c8-401e-98db-06521891a78d/datastream/OBJ/view