Factors influencing geodetic monitoring of dams using total station

Abstract

This article analyzes the influence of external agents during the geodetic monitoring of structures, a case study at the dam of the Hydroelectric Power Plant (UHE) in Mauá-PR, combining the satellite positioning method using GNSS with the irradiation method using robotic Total Station for determine eventual movements of monitoring points embedded in the dam parameter downstream and in the crest of the upstream bus. The procedures adopted consist of comparing the results of the monitoring carried out with the spillway gates opened with the results of the same monitoring carried out with the spillway gates closed and, consequently, analyzing whether the opening of the spillway interferes with the geodetic monitoring since, the spillway located in the center of the dam. Parallel to this, with the same equipment, the monitoring of points embedded in the crest of the upstream dam was carried out from two pillars, one on the left bank, another on the right bank of the reservoir and two systems of forced centering on the dam. After processing the data, analyzes were made where it was found that the fact that the dam has an open spillway affects the determination of the coordinates in the body of the dam downstream, presenting values significantly different from the coordinates with the open or closed spillway. It was also observed that depending on the point of the geodetic network used to determine the coordinates of the points on the crest of the dam, right, left margin or on the dam the coordinates also show significant variations.