title: Underwater Mach wave radiation from impact pile driving: theory and observation.
abstract: 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 Mach wave 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 time series compare well with corresponding field observations.
authors: Department of Mechanical Engineering, University of Washington, Seattle, Washington 98105-6698, USA.
authors: Per G
authors: PG
authors: Reinhall
authors: Peter H
authors: PH
authors: Dahl
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D003198:Computer Simulation; D020342:Finite Element Analysis; D019015:Geologic Sediments; D008962:Models, Theoretical; D009038:Motion; D009622:Noise; D009716:Numerical Analysis, Computer-Assisted; D009792:Oceans and Seas; D011312:Pressure; D012815:Signal Processing, Computer-Assisted; D013018:Sound Spectrography; D013997:Time Factors; D014160:Transducers, Pressure; D014867:Water
chemical_list: D014867:Water