SWIM – Recovery and measurement survey

The seas and oceans provide resources for a range of industrial and recreational activities, from commercial shipping to recreational boating, and from resource exploration to wind energy. All these rapidly expanding activities generate sounds, often very loud, that travel long distances through water. The growth of the ocean economy means that human-generated noise is becoming dominant in marine soundscapes worldwide. It has been observed that this can be very harmful to marine life, but the extent of the damage has not been quantified. Scientific knowledge of underwater noise pollution is growing rapidly but remains limited; further research is needed to provide policymakers with essential guidelines for the sustainable exploitation of marine resources. Future noise pollution models will need to include precise information on specific noise sources, the propagation of elastic waves in marine environments, and the impact of noise on individual marine species. SWIM helps us understand how new wind farms could affect toothed whales, depending on their characteristics (such as fixed or floating turbines) and their location.

The plan for the Recovery and Measurement Survey was to deploy two bottom recorders near the wind turbine blades, specifically at wind turbine number 2 and wind turbine number 6. For wind turbine number 2, the bottom recorder was positioned one metre from the turbine, while for wind turbine number 6, the sensor was placed five metres away. The purpose of measuring at different distances was to empirically detect the dispersion of noise following its propagation.