Análise dos efeitos da refração no monitoramento de barragens Estudo de Caso UHE Governador Jayme Canet Junior
Refractive Index Analysis in Dam Monitoring: Case Study Hydro eletric power plant Governor Jayme Canet Junior
DOI:
https://doi.org/10.21680/2447-3359.2025v11n1ID35730Abstract
The influence of atmospheric refraction on dam monitoring is a topic that requires study and discussion, due to variations in atmospheric conditions caused by the region's specific characteristics. The study site is the dam of the Governador Jayme Canet Junior Hydroelectric Plant, located between the municipalities of Ortigueira and Telêmaco Borba, in the state of Paraná. Due to the construction of the dam, the region has a large flooded area and downstream a large roller-compacted concrete (CCR) structure that absorbs solar radiation throughout the day, generating an important temperature gradient. The research evaluated variations in temperature, pressure and humidity throughout the day in determining the coordinates of monitoring points, using topographic irradiation with a total station, together with an automatic search system for the point to be monitored. To this end, a survey of these points was carried out using three different geodetic landmarks, two upstream and one downstream, with the purpose of calculating the coordinates of two geodetic landmarks located on the crest of the dam called CG01 and CG02. The results show that, even after correcting the distances depending on meteorological conditions, the calculated coordinates showed discrepancies and this variation suggests that possible errors may be due to the effects of refraction in the measurements of horizontal directions and vertical angles, as we observed a behavior where the average coordinates are more influenced by the point occupied in the survey than by the time of day. Analyzing the error ellipses, it is possible to verify that the biggest variations were in the morning, which suggests that solar incidence can cause a change in the refractive index in the region and consequently in the coordinates.
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