Experimental Validation Results of a Method for Assessing the LF Acoustic SourceLevels of Ships, Compensating Only for the Lloyd Mirror or Dipole Effect

摘要

This paper describes an experimental method reflecting important ranges of validmeasuring configuration parameters for assessing the low-frequency monopole source levels of sources placed in the vicinity of the water/air interface. The only effect to account for in the calculation is the Lloyd mirror or dipole effect, if bottom reflections are negligible. The validity of this assumption has been investigated by experiments and the results are reported. Also experimental data of bottom reflection contributions to the source level estimate for the cases of shallow water depths (200 m) are given. The validation of the method has important bearings on the conduct of experimental/operational situations at sea when acquiring data for source level estimates of ship noise.