MIGUEL RODRIGUES, SERGIO OLIVEIRA, JOSE NUNO LIMA & JORGE PROENCA


Figure 11 presents the GNSS radial displacement results of nearly three years worth of measurements. Its agreement with global dam behaviour in general, and in particular with the geodetic marks located near its location and the FEM calibrated results at the GNSS antenna location, show its usefulness in the dam’s observation. Presented in Figure 12 is a simpler separation of effects of the triangulation observations


at the geodetic mark at the top of the central section, for direct comparison with the GNSS results. Considering the objective in question, only the HP and temperature effects are taken into account, and the analyzed period is similar to the one available from the GNSS.


Figure 7. HSCT separation of effects results for the radial displacements measured by the plumbline method at coordinometer base FDE1 (elevation 294.6m)


From the analysis of Figure 7 to Figure 11, it is possible to observe that there is good adjustment between the HSCT curve and the observation values from each instrument (grey dots). Furthermore, this fact is supported by the high coefficients of determination obtained, i.e. greater than 96%.


160 DAM ENGINEERING


Vol XXXI Issue 3


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