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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/hess-2020-316
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-2020-316
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  07 Jul 2020

07 Jul 2020

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A revised version of this preprint is currently under review for the journal HESS.

Hydrological Signals in Tilt and Gravity Residuals at Conrad Observatory (Austria)

Bruno Meurers1, Gábor Papp2, Hannu Ruotsalainen3, Judit Benedek2, and Roman Leonhardt4 Bruno Meurers et al.
  • 1University of Vienna, Department of Meteorology and Geophysics, 1090 Wien, Austria
  • 2Geodetic and Geophysical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, 9400 Sopron, Hungary
  • 3Finnish Geospatial Research Institute, FGI, National Land Survey of Finland, 02430 Masala, Finland
  • 4Zentralanstalt für Meteorologie und Geodynamik (ZAMG), 1190 Wien, Austria

Abstract. The Superconducting Gravimeter GWR C025 monitors the vertical component of the gravity vector at the Conrad Observatory (Austria) since autumn 2007. Two tilt meters operate continuously since spring 2016: a 5.5 m long interferometric water level tilt meter and a Lippmann-type 2D pendulum tilt sensor. The co-located and co-oriented set up enables a wide range of investigations because tilts are sensitive both to geometrical solid Earth deformations and to gravity potential changes. The tide free residuals of the SG and both tilt meters clearly reflect the gravity/deformation effects associated with short- and long-term environmental processes and reveal a complex water transport process at the observatory site. Water accumulation on the terrain surface causes short-term (a few hours) effects which are clearly imaged by the SG gravity and N-S tilt residuals. Long-term (> a few days/weeks) tilt and gravity variations occur frequently after long-lasting rain, heavy rain or rapid snowmelt. Gravity and tilt residuals are associated to the same hydrological process but have different physical causes. SG gravity residuals reveal the gravitational effect of water mass transport, while modelling results exclude a purely gravitational source of the observed tilts. Tilt residuals show the response on surface loading instead. N-S tilt signals are much stronger than those of the E-W component most probably due to the well-known cavity effect of the 150 m long tunnel oriented in E-W direction.

Bruno Meurers et al.

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  • RC1: 'Review', Anonymous Referee #1, 13 Jul 2020 Printer-friendly Version
    • AC1: 'AC1', Bruno Meurers, 07 Oct 2020 Printer-friendly Version
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    • AC2: 'AC2', Bruno Meurers, 07 Oct 2020 Printer-friendly Version
  • EC1: 'HESS-2020-316', Marnik Vanclooster, 09 Sep 2020 Printer-friendly Version

Bruno Meurers et al.

Bruno Meurers et al.

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Short summary
Gravity and tilt time series acquired at Conrad Observatory (Austria) reflect gravity and deformation effects associated with short- and long-term environmental processes and reveal a complex water transport process after heavy rain and rapid snowmelt. Gravity residuals are sensitive to the Newtonian effect of water mass transport. Tilt residual anomalies capture strain-tilt coupling effects due to surface or subsurface deformation caused by precipitation or by pore pressure change.
Gravity and tilt time series acquired at Conrad Observatory (Austria) reflect gravity and...
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