Hundreds of Kinemetrics monitoring instruments have been installed in dams throughout the world, from Los Angeles County and Pacoima, California, to Hoover Dam, Nevada, to Tarbella Dam, Pakistan, Vidraru Dam, Romania, El Toro Dam, Costa Rica and many others. Kinemetrics instruments measure ground and structural responses both before and after the dams are filled as well as for long-term monitoring. Finite element analysis, in 2D or 3D requires synchronized real data to verify the validity of the mathematical dynamic model. Kinemetrics’ instruments provide these data with high accuracy, while the Kinemetrics OASIS software offers remote real time alerting with on-screen imaging and audible alarms.
A few of the characteristics of the Kinemetrics instruments that customers prefer are the high dynamic range, frequency bandwidths, anti-alias filters, and the fact that Kinemetrics’ Altus family of stand-alone recorders can be synchronized with GPS to within 500 micro-second precision.
Kinemetrics instrumentation is being used in two current projects: the St. Marguerite project in Quebec, Canada and the Katse dam in South Africa.
Katse Dam, South Africa
The Katse Dam, at 185m high, is part of the Lesotho Highlands water project in South Africa, one of the world’s largest civil engineering projects currently in progress. The project will redirect a portion of the water to South Africa as well as provide water and power for the country of Lesotho. On March 10, 1998, the reservoir was fully impounded and for the first time, water issued over the spillway. A UK company, Soil Instruments is the subcontractor for the project for the supply and installation of measuring devices. A total of seven Kinemetrics strong motion accelerographs have been installed at the site near the left bank, mid point and right bank at the foundation and crest levels of the dam. A single unit is installed in the center of the dam body. The seismic control computer receives data from the remote accelerographs and is used to trigger a change in the recording frequency of the data stored by the software on the main computer. The data files are then produced by the main computer for analysis by the engineer.
St. Marguerite Project, Canada
Construction of the Hydro-Quebec project, the Sainte Marguerite, began in 1994 with preliminary construction works. The first phase of the project was awarded in 1966 with the 144m high dam contract going to the joint venture of Enterprise du Bonseil and Spi Batignoles of Quebec. As of May 1998, the dam had been completed to a height of about 120m, with the underground powerhouse and the 8.3 km of tunnels progressing according to schedule. The actual filling of the reservoir will take about three years, with the commissioning to take place in 2001. Hydro-Quebec is using a 12-Channel Altus K2 with FBAs to measure the structural responses of the St. Marguerite.