Posters
Come meet the poster presenters to ask them questions and discuss their work
We would like to invite you to come and see the posters at our upcoming conference. The posters will showcase a diverse range of research topics, and will give delegates an opportunity to engage with the authors and learn more about their work. Whether you are a seasoned researcher or simply curious about the latest developments in your field, we believe that the posters will offer something of interest to everyone. So please join us at the conference and take advantage of this opportunity to learn and engage with your peers in industry and the academic community.
PO033: Predicting Underwater Noise from Vibratory Pile Driving
Timo Molenkamp, Acoustic Specialist, Delft Cymatics
Abstract
Vibratory pile driving is increasingly applied in offshore wind construction as a potentially quieter and more efficient alternative to impact piling. Yet, uncertainties persist in predicting the resulting underwater noise, which is essential for environmental risk assessment and compliance with regulatory limits. This study advances the predictability of sound emission from vibratory pile driving by introducing a dedicated in-house numerical model. The model couples a wave equation formulation in the surrounding fluid–soil domain with shell dynamics for the pile. A key innovation lies in the relaxation of conventional soil–pile interface conditions, which enables a more realistic representation of pile vibrations and energy transfer, thereby significantly improving the noise predictions. Predictions were validated against full-scale measurements of vibratory pile driving noise. The results demonstrate that the model accurately reproduces overall sound levels and frequency spectra, showing good agreement. Notably, the simulations indicate that higher harmonics in the hammer excitation play a dominant role in shaping the radiated noise field. These harmonics can elevate sound pressure levels in frequency bands of ecological concern, underlining the importance of accurately characterising hammer dynamics. However, hammer specifications remain a significant source of uncertainty, leading to uncertainty in noise emissions predictions. The study demonstrates the potential of advanced modelling to deliver site-specific underwater noise forecasts and to identify high-risk scenarios for elevated sound emissions. Its unique treatment of the pile–soil interface marks a significant step forward in predicting vibratory pile driving noise with greater confidence. At the same time, improved hammer source characterisation remains essential to further reduce uncertainties.
No recording available for this poster.
