The underwater noise from impact pile driving is studied using a finite element model for the sound generation and parabolic equation model for propagation. Results are compared with measurements using a vertical line array deployed at a marine construction site in Puget Sound. It is shown that the dominant underwater noise from impact driving is from the Machwave associated with the radial expansion of the pile that propagates down the pile after impact at supersonic speed. The predictions of vertical arrival angle associated with the Mach cone, peak pressure level as function of depth, and dominant features of the pressure timeseries compare well with corresponding field observations.
Underwater Mach Wave Radiation from Impact Pile Driving: Theory and Observation
Title: Underwater Mach Wave Radiation from Impact Pile Driving: Theory and Observation
September 01, 2011
Journal: Journal of the Acoustical Society of America
Publisher: Acoustical Society of America
Reinhall, P.; Dahl, P. (2011). Underwater Mach Wave Radiation from Impact Pile Driving: Theory and Observation. Journal of the Acoustical Society of America, 130(3), 1209-1216.