Technical report: Shell dam horizontal displacement monitoring – comparative study using geodetic measurement, optical plumb and GPS technologies
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Quintiliano Mascarenhas Guedes
Abstract
This paper presents a comparative study of the displacement of the Brazilian Funil Shell Dam centre arch crown as derived from two measurement campaigns using three independent procedures: GPS satellite positioning, terrestrial geodetic techniques and coupled optical plumb measurements with an inverted pendulum. For the GPS measurement, four dual frequency GX1220 GPS receivers from Leica Geosystems were installed in the crest of the dam and in three concrete pillars used as control points. For geodetic measurement, a DI2002 Electronic Distancemeter fitted on the telescope of a T2 theodolite was used. The optical plumb measurement was made using a Nadiral Optical Plumb manufactured by Wild Heerbrugg and calibrated by Furnas Metrology Laboratory. Results showed that GPS technology can be used successfully for horizontal displacement monitoring in areas with high level of multi-path such as water dam surrounding area. The GPS accuracy was also estimated based on the Gauss-Markov homoscedastic model using the historical nadiral optical plumb observations as standard observation.
© de Gruyter 2009
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Articles in the same Issue
- Global investigations of the satellite-based Fugro OmniSTAR HP service
- VirtuaLites: concepts and numerical testing results
- Prediction of zenith tropospheric delay by multi-layer perceptron
- Deformation analysis of the unified lunar control networks
- Uncertainty of NURBS surface fit by Monte Carlo simulations
- Technical report: Shell dam horizontal displacement monitoring – comparative study using geodetic measurement, optical plumb and GPS technologies
- News Section
