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Thursday, 12 March 2015
11:45 - 13:15 Underwater noise mitigation strategies - practical experiences, innovations and dynamic noise limits

Planning & environmental impacts  

Room: A10

Session description

Underwater noise is recognized as one of the main pressures in the marine environment, and noise emission from pile driving during installation of offshore wind turbine foundations is becoming an increasing concern and challenge for the industry. In this session delegates will learn about how leading offshore wind developers managed to install foundations in compliance with regulatory noise limits using bubble curtain type noise mitigation systems. The session also explores alternative noise mitigation systems and discusses advantages and disadvantages of each method. Finally, a new approach will be presented on defining underwater noise limits based on a risk assessment approach. This is envisaged to be implemented for the Danish 400 MW Horns Rev 3 offshore wind farm located in the North Sea.

Learning Objectives
  1. Discuss latest experiences and knowledge obtained from two offshore wind projects including cost and risk aspects
  2. Identify pros/cons of different underwater noise mitigation systems
  3. Assess the value of combined full scale measurements and modelling of underwater noise propagation
  4. Evaluate how a risk based approach on setting underwater noise limits in Danish waters can help reducing construction cost

This session will be chaired by:
Henrik Kofoed-Hansen, Head of Department, DHI, Denmark
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Frank Thomsen, Senior Marine Scientist, DHI, Denmark
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