Department of Mechanical Engineering, University of Maine, 219 Boardman Hall, Orono, Maine 04469, USA.
J Acoust Soc Am. 2012 Sep;132(3):EL229-35. doi: 10.1121/1.4739251.
To understand mysticete acoustic-based detection of ships, radiated noise from high-speed craft, cruise ships, catamarans and fishing vessels was recorded June-September 2009. Calibrated acoustic data (<2500 Hz) from a vertical hydrophone array was combined with ship passage information. A cruise ship had the highest broadband source level, while a fishing vessel had the lowest. Ship noise radiated asymmetrically and varied with depth. Bow null-effect acoustic shadow zones were observed for all ship classes and were correlated with ship-length-to-draft-ratios. These shadow zones may reduce ship detection by near-surface mysticetes.
为了理解须鲸类动物基于声学的船舶探测，我们于 2009 年 6 月至 9 月期间记录了高速船、游轮、双体船和渔船的辐射噪声。我们将垂直水听器阵的校准声数据（<2500 Hz）与船舶通过信息相结合。一艘游轮的宽带声源级最高，而一艘渔船的最低。船舶噪声辐射不对称，并随深度变化而变化。我们观察到所有船舶类型都存在船首零效应声影区，且与船长与吃水比相关。这些声影区可能会降低近海面须鲸类动物对船舶的探测能力。
