Modelling time variation of gravity gradients due to water level fluctuations

• Autorzy: Tóth G. , Völgyesi L. , Cerovský I.
• Konferencja: Geodetic and Geodynamic Programmes of the CEI (11 Symposium; 25-30.04.2004; Nice, France)
• Języki publikacji: EN

Abstrakty

EN

The water level fluctuations of the Danube River in Budapest during the great flood in 2002 were recorded. The 3D model of the river bed allowed us to build an accurate polyhedral model of the time variation of mass changes of the flood. This mass density variation model made it possible to compute and compare time variations of various gravitational field functionals. Gravity and full gravitational gradient tensor changes were computed on a regular grid for the model area and these changes were compared with accuracies attainable for gravity measurements. This way we were able to evaluate which kind of gravitational field parameter is more suitable for detecting gravitational field variations due to near-site mass changes. Gravity changes were also compared with actual gravitational field measurements made during the flood with two LCR gravimeters. We studied also the possibility of predicting gravity changes from certain combinations of measured gravity gradients where no mass variation model is available. This latter technique may be relevant in the future to support absolute gravity measurements by detecting the effect of local gravitational field changes through repeated gravity gradient measurements.

Słowa kluczowe

EN

gravitational tensors; water level fluactions; gravity gradients

PL

tensory grawitacyjne; pomiary

• Wydawca: Wydział Geodezji i Kartografii Politechniki Warszawskiej
• Czasopismo: Reports on Geodesy
• Rocznik: 2004
• Tom: nr 2/69
• Strony: 309--314
• Opis fizyczny: Bibliogr. 5 poz., rys., wykr.

Twórcy

autor

Tóth G.

• Budapest University of Technology and Economics, Department of Geodesy, H-1521 Budapest, Műegyetem rkp. 3, Research Group of Physical Geodesy and Geodynamics of the BUTE-HAS

autor

Völgyesi L.

• Budapest University of Technology and Economics, Department of Geodesy, H-1521 Budapest, Műegyetem rkp. 3, Research Group of Physical Geodesy and Geodynamics of the BUTE-HAS

autor

Cerovský I.

• Eberhard Karls Universität Tübingen, Institut für Geowissenschaften. Sigwartstr. 10, D-72076 Tübingen, Germany

Bibliografia

• 1. Benedek J. (2002): The application of polyhedron volume element in the calculation of gravity related quantities. Geomatika Közlemények V, MTA FKK Geodéziai és Geofizikai Kutatóintézet, Sopron, pp. 191-206. (In Hungarian)
• 2. Cerovský I., Meurers B., Pohánka V., Frisch W., Goga B. (20.04): Gravity and magnetic 3D modeling software - Mod3D, in Meurers, B. and Pail, R. (eds): Proc. 1st Workshop on Int. Gravity Field Research, Österr. Beitr. Met. Geoph., 163-168, in press.
• 3. Csapó G., Szabó Z., Völgyesi L. (2003): Changes of gravity influenced by water-level fluctuations based on measurements, and model computations. Reports on Geodesy, Warsaw University of Technology, Vol. 64, Nr 1, pp. 143-153.
• 4. Tóth Gy. (2003): The Eötvös spherical horizontal gradiometric boundary value problem - gravity anomalies from gravity gradients of the torsion balance. Gravity and Geoid 2002, I.N. Tziavos (Ed.), Editions Ziti, pp. 102-107.
• 5. Vassiliou, A.A. (1986): Numerical Techniques for Processing Airborne Gradiometer Data. PhD thesis, Department of Civil Engineering, University of Calgary, Calgary, Alberta. UCSE Report No. 20027.