| dc.description.abstract | The cases considered by the COMPILE 2014 workshop in Hamburg defined a pile (length 25 m), a shallow-water environment (depth 10 m), the pile’s vertical position in it, and a force waveform on the pile head. It also defined both close-range and far-range receiver positions, at which acoustic Sound Exposure Levels (SEL) and Peak of the Sound Pressure Level (P-SPL) were to be calculated. The organisers published a comparison of results from six participants’ pile vibration and far-range propagation models during 2016. Five were Finite-Element Models and one was a Finite-Difference Model; there was no analytical model. For far-ranges, the workshop nominated ranges of 0.75, 1.5, 10, 20 and 50 km. The writer’s in-house analytical model FAMPRADOP [“Far-range Analytical Model for Pressure Radiated from a Driven Offshore Pile”] has recently been applied to the far-range COMPILE workshop cases. At 0.75 and 1.5 km, the six participants’ results and FAMPRADOP agreed closely amongst each other. At the greater ranges, some participants’ results differed from the others, by up to 15 dB at 50 km. The FAMPRADOP results generally lie close to the minimum of the spread in the participants’ results, for reasons that will be discussed. | en_US |
