Finnish Naval Research Institute, PO Box 116, FIN-02631 Espoo, Finland.
J Acoust Soc Am. 2011 Apr;129(4):EL128-34. doi: 10.1121/1.3555767.
Ambient noise spectra in a shallow brackish water environment were found to be steeper than expected at frequencies above 10 kHz. The high-frequency behavior of the spectra was resolved by modeling dispersion and noise in bubbly water. Bubble size distributions fitted to the brackish water spectra exhibit a distinctive maximum in the radius range 0.1-0.3 mm, and a substantial drop in bubble density below a radius of 0.1 mm. The brackish water distributions were tied to an oceanic spectrum with a spectral slope of 5.7 dB/octave obtained with a -3 / 2 power law dependence of bubble size density on radius.
在浅咸水环境中，环境噪声谱在高于 10 kHz 的频率下比预期的更陡峭。通过对气泡水中的频散和噪声进行建模，解析了谱的高频行为。拟合咸水谱的气泡尺寸分布在半径 0.1-0.3 毫米范围内表现出明显的最大值，并且在半径小于 0.1 毫米时气泡密度显著下降。咸水分布与海洋谱相关联，海洋谱的斜率为 5.7 dB/倍频程，气泡尺寸密度与半径的-3/2 幂律关系。
