Monitoring of mining induced subsidence through measurement of ground strains with Fiber Bragg Grating sensors
In this paper the application of Fiber Bragg Grating based sensors for the monitoring of mining induced subsidence phenomena is illustrated. A high number of sensors were installed in the pavement of a major highway thanks to the use of Bragg Grating arrays encapsulated in composite rods. The sensors and the associated demodulation equipment provide continuous measurements and allow the immediate implementation of safety measures by the authorities responsible for the highway.
Mining subsidence land survey by SAR interferometry
The overall philosophy of this collaborative project, between Doncaster College. RJB Mining (UK), GEC Marconi Research Centre and Matra Marconi Space (UK), is to improve the accuracy of subsidence prediction models implemented in the mining industry. These models help mine management, in terms of productivity, conformity with regulatory consent, and minimised environmental and economical impacts. However, the models currently produce actual to predicted subsidence results in the range 43%-773%, which then have to be adjusted using local knowledge. The project aims to provide accurate data on elevation change due to mining activity, via the application of radar interferometry with ERS synthetic aperture radar (SAR) data. These elevation change data can then be fed into subsidence models to improve predictions about subsidence. Initial interferometry results are presented showing evidence of subsidence. Validation is underway and preliminary interpretations are offered and discussed.
Mangone's concise marine almanac
Measurements of marine forms physical-political marine features naval forces merchant marines and ports fisheries marine and seabed minerals pollution of the marine environment.