Geometric Aspects Evaluation of GNSS Control Network for Deformation Monitoring in the Jatigede Dam Region

Abstract

Many factors led to dam construction failure so that deformation monitoring activities is needed in the area of the dam. Deformation monitoring is performed in order to detect a displacement at the control points of the dam. Jatigede Dam deformation monitoring system has been installed and started to operate, but there has been no evaluation of the geometry quality of control networks treated with IGS points for GNSS networks processing. Therefore, this study aims to evaluate the geometric quality of GNSS control networks on deformation monitoring of Jatigede Dam area. This research data includes the GNSS measurements of five CORS Jatigede Dam stations (R01, GG01, GCP04, GCP06, and GCP08) at doy 233 with network configuration scenarios of 12 IGS points on two quadrants (jat1), three quadrants (jat2), and four quadrants (jat3 and jat4). GNSS networks processing was done by GAMIT to obtain baseline vectors, followed by network processing usingparameter method of least squares adjustment. Networks processing with least squares adjustment aims to determine the most optimal by precision and reliability criterion. Results of this study indicate that network configuration with 12 IGS stations in the two quadrants provides the most accurate coordinates of CORS dam stations. Standard deviations value of CORS station given by jat1 configuration are in the range of 2.7 up to 4.1 cm in X-Z components, whereas standard deviations in the Y component are in the range 5.8 up to 6.9 cm. An optimization assessment based on network strength, precision, and reliability factors shows optimum configuration by jat1.

GNSS-Based Dam Monitoring: The Application of a Statistical Approach for Time Series Analysis to a Case Study

“…As happened with remote sensing techniques [15][16][17][18], the application of methods based on Global Navigation Satellite Systems (GNSS) is now consolidated, where GNSS networks of points are measured with reference to proximal CORS (Continuously Operating Reference Station) or other stations established on purpose in nearby stable areas [19][20][21][22]. More recently, automatic systems based on GNSS positioning have been developed to be integrated into early-warning systems for dam safety management [23,24].…”

Validation of the accuracy of geodetic automated measurement system based on GNSS platform for continuous monitoring of surface movements in post-mining areas

“…Among other works which address the problem of optimisation of observation networks for the acquisition of high observation accuracy of surface deformation, the works of Stepniak et al (2013), Blachowski et al (2010) and Sokoła-Szewioła and Siejka ( 2009) can be referenced. The problem of quality assessment involving the geometry of the GNSS observation network for monitoring surface deformation, in this case in the area of a dam, was discussed in detail by Sanjaya et al (2019), where the authors defined the most optimal solutions, taking into account the criteria of precision and reliability of measurements.…”