Research on the Topology of Earth Dam by using GNSS Technology

Monitoring and assessment of the operational safety of hydrotechnical constructions made of earth and local materials requires geodetic measurements at specified intervals. Among these hydrotechnical constructions are the earth dams which have many negative events. A high percent of accidents in Romania occur at small earth dams. Monitoring the topology of earth dams is done by classical geodetic methods. But, in recent times, new technologies have emerged to track the topology of earth dams, of which GNSS technology stands out. Research conducted with GNSS technology, to monitor the geometric parameters of a dam in the Moldova area, has highlighted the reliability of the method by the accuracy of the results and reduced working time. Fild research conducted at the Podisu Dam in Iasi county, in conjunction with documentary studies on the evolution over time of the topology of the earth dam showed important changes with an influence on the stability of the construction. Interpretation of the data obtained by measurements showed a change in the geometric shape in the horizontal plane and in cross sections. The method of measurements performed using two GNSS receivers was used in the research.