The noise associated to ship operations within large commercial harbours is an issue because often these infrastructures affect strongly the overall acoustic levels of close residential areas. The dimensions and complexity of the ship noise sources and of the transmission path to the receiver make the sound pressure field particularly complex. In this situation, even an assessment of the acoustic impact of harbours may be particularly difficult to achieve, if based on a purely experimental approach. This situation calls for the use of prediction models that, with a proper calibration, allow exploring with continuity the acoustic field in the areas around the source. Moreover, models become essential when studying corrective actions and comparing their effectiveness. Within this general context, the present work illustrates the preliminary experimental activities carried out in a part of the Naples commercial harbour for the calibration of a numerical model of the noise field associated to the operation of a specific ship. The model, based on a Ray Tracing approach, includes both the main noise sources on board the ship and the surrounding physical structures (buildings and infrastructures characterizing the area). The paper describes the main characteristics of the model and presents the procedure envisaged for its development and calibration. Results of the on-field experimental campaign in a portion of the port of Naples are presented and discussed in view of the identification and characterisation of the ship sources detected and surveyed and of the first part of the propagation path around the ship.
|Titolo:||On field experimental characterisation of the ship sources of acoustic pollution within a commercial harbour|
|Data di pubblicazione:||2017|
|Appare nelle tipologie:||04.01 - Contributo in atti di convegno|
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|2017 ICSV24 On field experimental characterisation of the ship sources MVis-TCop-FQua-ERiz.pdf||Documento in Post-print||Open Access Visualizza/Apri|