Small explosions were used as sound sources in the Seabed Characterization Experiment conducted in spring 2017 in the New England Mud Patch, a shallow-water region with a depth of approximately 75 m. The sources were U.S. Navy Signal Underwater Sound (SUS) Mk 64 charges, which contained 31.18 g of the explosive 2,4,6-Trinitrophenylmethylnitramine, commonly referred to as Tetryl. Source recordings were obtained by two hydrophones deployed from the same ship that deployed the SUS. The recordings were analyzed for bubble period, energy spectral density, and the variability of these parameters, and compared to previous results from the literature, including the prediction of a historic spectral model, and a new semiempirical time-domain model assembled using measured data from the literature. The new model describes the source level measurements in the 25–275-Hz band and in the 400-Hz octave band to within 0.5 dB, and agrees with similar measurements from the literature to within 0.6 dB. The standard deviation of the band-limited source levels was found to be about 1 dB, some of which is ascribed to uncertainty and variation in the source-to-receiver distance. The observed source level variation is similar to previously reported values.

中文翻译：

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用于海底表征的浅水中爆炸声的短程特征

2017 年春季在新英格兰泥滩（一个深度约为 75 m 的浅水区）进行的海底特征实验中，小爆炸被用作声源。来源是美国海军信号水下声波 (SUS) Mk 64 炸药，其中包含 31.18 克爆炸性 2,4,6-三硝基苯甲基硝胺，通常称为 Tetryl。源录音是由部署 SUS 的同一艘船上部署的两个水听器获得的。对记录的气泡周期、能量谱密度和这些参数的可变性进行了分析，并与文献中的先前结果进行了比较，包括对历史谱模型的预测，以及使用来自文献。新模型描述了 25–275-Hz 频带和 400-Hz 倍频程频带中的源电平测量值在 0.5 dB 以内，并且与文献中的类似测量值在 0.6 dB 以内一致。发现带限源电平的标准偏差约为 1 dB，其中一些归因于源到接收器距离的不确定性和变化。观察到的源水平变化与先前报告的值相似。