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  4. Understanding soil transmission paths of offshore pile driving noise - Seismic waves and their implications
 
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Understanding soil transmission paths of offshore pile driving noise - Seismic waves and their implications

Publikationstyp
Conference Paper
Date Issued
2016-08-21
Sprache
English
Author(s)
Ruhnau, Marcel  
Heitmann, Kristof  
Lippert, Tristan  
Lippert, Stephan  
Estorff, Otto von  
Institut
Modellierung und Berechnung M-16  
TORE-URI
http://hdl.handle.net/11420/5425
Start Page
7145
End Page
7153
Citation
INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: 7145-7153 (2016-08-21)
Pile driving is a common technique to install the foundations of offshore structures, like monopiles for wind turbines or jacket piles for oil and gas platforms. It is accompanied by significant hydroacoustic noise immissions, which have led to an increased awareness of the approving authorities and tightening regulations in some countries over the past years. Depending on the governing law, these include sound monitoring measures, seasonally restricted construction phases as well as limiting values for construction-related sound levels. In many cases, the construction work takes place in shallow water environments, where the soil has a major impact on the resulting wave field. This is mainly due to the occurrence of multiple reflections, the excitation of head waves, and the possibility of energy tunneling sound mitigation systems through the soil. The pile that incrementally penetrates the soil with each hammer blow acts like a very characteristic line source, which excites seismic surface as well as body waves. Measuring these seismic arrivals enables to gain further information about the local soil characteristics. The present work is based on measurement data that have been collected within the frame of three construction-accompanying offshore measurement campaigns and focuses on embedment length-dependent frequency content of hydroacoustic/seismic signals.
Subjects
Pile driving
Soil transmission
Underwater noise modelling
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