MAREE has conducted acoustic measurements to minimize blasting effects during a gas terminal construction. The aim of the project was to provide the local propagation decreasing law versus range featuring the use of a buried blast, and to make recommendations to protect fauna and flora.
Measurements were designed to provide:
- Quantitative measures of water shock wave by means of hydrophones located at three ranges (compressional wave analysis),
- Quantitative measures of soil shock wave by means of a buried 3-axis geophone
Figure 1 : Left, Blast recording with a short range hydrophone (typically 25m of the blast). Right, Blast recording with a medium range geophone with its three components of vibration (typically 200m of the source).
Simulations were done to:
- Analyse and understand the nature of received signals (by means of CW models and eventually computing synthetic temporal signals),
- Establish a hierarchy among the physical processes involved with that problem,
- Provide safety ranges for fauna and flora,
- Propose mitigation measures to reduce blasting effects