Dam MonitoringPosted on December 5th, 2016 by vapro
The system is designed to monitor the effects of reservoir and dam loads on the dams and their foundations, ensuring that any adverse conditions that develop during initial filling and operation are detected as soon as possible. When the facility is located in a seismically active area, the dam deformation monitoring program could be supplemented by an on-site GPS area monitoring network that is connected to the continuously operating (GPS) with known reference stations.
In addition to routine visual inspection, the system consists of:
- Geotechnical monitoring instrumentation consisting of strong motion accelerographs, piezometers, load cells, weirs, inclinometers, crack meters, and extensometers, supported by the Automated Dam Monitoring System (ADMS) Hydrometeorological sensors
- A real-time GPS monitoring system
- An automated terrestrial geodetic monitoring system consisting of eight permanently installed robotic total stations and an array of 228 prisms mounted on the faces of the monitored structures.
- If the facility is located in a seismic area, a local seismic network of at least five seismic stations is recommended.
The automation of data gathering and the use of the state-of-the-art technologies allow:
- Real time monitoring of the behavior of the dam.
- To optimize the measurements, with high degree of reliability and repetitiveness.
- To compare the measurements with the design values and to correlate between them.
- To define the safe levels of operation.
- To identify the occurrence of events that could affect the integrity of the dam.
Advantages of an automated monitoring system
- Data gathering, diagnosis, calibration and remote programming.
- 10 to 100 times higher precision, avoiding human errors.
- The readings are automatically taken and more frequently, reducing the instrumental error.
- Graphic display and on time processing.
- Digital data is more reliable, robust, and easy to process and plot.
- Minimize the cost of specialized labor.
- The information is always accessible when it is needed.
- It is possible to have an early warning and alarm system.
Relative disadvantages of an automated dam monitoring system
- Large data volumes.
- High initial installation costs, but the reduction of specialized labor cost will overcome this cost in a few months.
- The technical staff is less concerned with the field observation.
- The system requires a permanent power supply.
- Lightning could affect the system.
- It requires experienced IT personnel.
- Maintenance costs.
Typical dams’ instrumentation