相关实验视频
Updated: Jun 12, 2025

07:36
Studying Cavitation Enhanced Therapy
Published on: April 9, 2021
5.2K
量化船舶噪音和海洋音景中的声学息地丧失
B Hendricks1, M K Pine2, G Baer3
1SoundSpace Analytics, 2845 Penrith Ave, Cumberland V0R 1S0, British Columbia, Canada.
Marine pollution bulletin
|June 10, 2025
概括
一个新的框架准确地量化了水下船舶噪音和海洋生态系统中的声学息地丧失. 该工具有助于评估噪音对海洋声景的影响,解决有效管理的关键知识缺口.
科学领域:
- 海洋声学 海洋声学
- 生物声学是一种生物声学.
- 环境声学环境声学
背景情况:
- 由于小型,没有跟踪的船只,量化水下船舶噪音是很困难的,这导致了海洋管理的知识差距.
- 现有的方法难以考虑船舶交通的全部范围,这影响了对海洋声景的准确评估.
研究的目的:
- 开发和验证一个计算效率高的框架,用于检测水声录音中的所有船舶噪声.
- 量化水下船舶活动造成的过度噪音水平和声学息地丧失.
- 提供一个具有成本效益和可复制的工具,用于评估船舶噪声对海洋声景的影响.
主要方法:
- 开发了一个新的框架来检测水声录音中的船舶噪声.
- 该框架应用于加拿大不列颠哥伦比亚省五个地点一年的声学数据.
- 评估了准确性,对变化的交通和天气的稳定性,以及对噪音影响的量化.
主要成果:
- 船舶噪声探测器达到96.4%的准确性,并在不同条件下证明了其稳定性.
- 每年船舶噪声存在率在24%至85%之间,噪声水平增加了1.0dB至6.4dB.
- 杀手 (0.5-15 kHz) 的声学息地损失范围从6.6%到46.9%,在白天和夏天的影响更大.
结论:
- 开发的框架提供了一种可靠和有效的方法来量化水下船舶噪音及其生态影响.
- 船舶噪声对海洋声景产生重大影响,其影响因城市中心附近和季节而异.
- 这项研究提供了第一个全面的实证评估船舶噪音影响在一个地区的不列颠哥伦比亚省生态系统.
相关概念视频
Habitat Fragmentation
17.4K
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
17.4K
Echo
493
The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
493
Sound Intensity Level
4.1K
Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...
4.1K
Sound Intensity
4.0K
The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the...
4.0K
Deriving the Speed of Sound in a Liquid
482
As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave...
The speed of sound in fluids can be derived by considering a mechanical wave...
482
Sound Waves: Interference
3.7K
Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
3.7K

