| Dam safety
Above: In 2017, Kinemetrics supplied and installed seismic instrumentation for the Ruskin Dam in British Columbia, Canada
Left: Kinemetrics has designed a seismic monitoring system across seven EGAT dams in Thailand
Ruskin Dam, British Columbia, Canada Ruskin Dam is a concrete gravity dam on the State
River in Ruskin, British Columbia, Canada. It was completed in 1930 for the primary purpose of hydroelectric power generation. In 2017, Kinemetrics supplied and installed seismic instrumentation for this dam, including Obsidian recorders, world- standard Episensor ES-T and SBEPI (Shallow Borehole Episensor). There were four Obsidian 4-ch recorders, which were connected to the Episensors, as well as an Obsidian 8-ch recorder, which was interfaced to one ES-T and one SBEPI. They were installed in five different locations, which included the dam gallery, left abutment, right abutment and two control rooms. Upon installation, the dam staff were fully trained by Kinemetrics to successfully operate and maintain the system.
Multi dam implementation in Thailand The Electricity Generating Authority of Thailand
(EGAT) is Thailand’s leading state-owned power utility under the Ministry of Energy and responsible for electric power generation and transmission for the whole country. It owns and operates different power plants at 45 sites across the country, and this includes 24 hydropower plants. EGAT also owns and operates a high voltage transmission network which covers all parts of the country. Kinemetrics, through its operator representative
AES, has designed a seismic monitoring system across seven EGAT dams. Each dam has instrumentation of four short-period stations for induced seismicity and three or four accelerographs (Basalt) at the crest, toe, abutment, and about 2km downstream. The local data acquisition is performed with Rockhound platform and the central data acquisition with the Antelope platform installed on 2 Dell servers running RHEL. The Aspen System at the headquarters of EGAT in Bang Kruai District, north of Bangkok, acquires all data in real-time. The system is tuned to carry out automatic location of small local events near each dam and regional events. The system automatically calculates the peak ground acceleration (PGA). In addition, a new event triggers a custom process that creates event files for each station including PGA calculation. Antelope distributes an e-mail that contains all event information including PGA, PGV, PGD plus the links to the event files. Real time response spectra are calculated and if any of the three curves crosses the top lines, an alarm will be issued. ●
Author information Edelvays Spassov is the Head of Dam Seismic Monitoring Programme at Kinemetrics, 222 Vista Avenue, Pasadena, CA 91107, US.
www.waterpowermagazine.com | August 2022 | 23
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