| Abstract |
One of the ocean noise sources comes from shipping. The noise is produced by ship’s propulsion mechanism and propeller, which is raising the noise energy in the water. In recent years, the new ship weight keeps gaining up, so more powerful engine and propeller produce much higher noise energy, due to the increasing shipping need. The noise pollutions in the ocean become more serious. This research uses Kaohsiung Harbor to analyze for the ship noise of over 500 tons, by using AIS (Automatic Identification System) that provide instant information about the ship’s location, ship length, speed, along with AMSN 1.0 (Acoustic Module for Sea-surface Noise) for sound field simulation. Shipping noise field simulated by AMSN is based on area source level method, but we propose another method of speed source level to compare with. Field measurement in Kaohsiung harbor was compared with numerical estimation by correlative analysis, two methods have both high correlation, but the levels were underestimated totally. Therefore, source levels in the simulation were compensated by measurement data, so the noise level estimation of Kaohsiung harbor could get better accuracy. |
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