measuring inclinations in cabril dam with an ...€¦ · measuring inclinations in cabril dam with...
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MEASURING INCLINATIONS IN CABRIL DAM WITH AN OPTOELECTRONIC SENSOR
Maria João Henriques
José Nuno Lima(Applied Geodetic Divison, Concrete Dams Department)
Sérgio Oliveira(Numerical and Physical Modelling Division, Concrete Dams Department)
>The Cabril dam
>Optoelectronic Sensor
>Sensors placed at Cabril dam
>Results
>Conclusions
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10 Highest Dams in Portugal
1951 1960 1970 1976
1980 1990 2000
100m
100m
2
132m
Dam problems
crest: thicker
centralcantilever
Cracking at downstream dam face in 1996
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Design Changed During Construction
Design Change During Construction
Pedrogão Pequeno(325 m)
Pedrogão Grande(419 m)
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(2008) Test to analyse the response of geodeticmethods to continuous monitoring
Inclination Measurements
Leica Nivel 210drift free dual axis inclinometerrange[ ‐310”, 310” ] accuracy:1”
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Optoelectronic sensor
1 – Detail of the prism:line pattern
3 – CCD array2 ‐ Tank (silicone oil)
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Optoelectronic sensor
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Cabril dam: Sensors
Leica Nivel 2101Hz
Comet D4130digital thermo‐hydro‐barometer
10 min
Sensors positions
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Inclinations variations
Inclinations variations+temperature
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Inclinations: standard deviations
vibration of the structure induced by the operation of the electricity generator group
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Modelling the variations
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i ‐ inclination componenth ‐ the reservoir level t ‐ the time of day
Periods, of 12 and 24 hours, identified as relevant through a Fourier analysis
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Modelling the variations (radial component)temperature variation – inclination variation: time lag ≈ 4 h 40min
variations of inclination are mainly influenced by the variations of daily temperature (correlation coefficient equal to ‐0.94)
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Modelling the variations (tangential component)
( ) ct
bt
bt
bt
bhathd +++++=12
2sin
12
2cos
24
2sin
24
2cos, 4321
ππππtangential component has a more obvious correlation with the variation of water level than with the outside temperature (correlation coefficient
equal to -0.70 and -0.50, respectively)
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Conclusions
>Inclinómetro Leica Nivel 210 was able: to detect the influence of temperature and reservoir level in dam Cabrilbehaviour.
to record the vibration of the structure induced by the operation of the electricity generator group.
> What would be desirable: to install this equipment during a longer period of time, if possible during several years, in order to detect the influence of other quantities in the behaviour, including annual variations in temperature, significant variations of reservoir level and possible long term effect.
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Thank you for your attention