Academic Journal
Long-term statistics and wind dependence of near-bottom and deep-sea ambient noise in the northwest South China Sea
| العنوان: | Long-term statistics and wind dependence of near-bottom and deep-sea ambient noise in the northwest South China Sea |
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| المؤلفون: | Wei Guo, Juan Liu, Guojun Xu, Guangming Li, Pan Xu |
| المصدر: | Frontiers in Marine Science, Vol 10 (2024) |
| بيانات النشر: | Frontiers Media S.A., 2024. |
| سنة النشر: | 2024 |
| المجموعة: | LCC:Science LCC:General. Including nature conservation, geographical distribution |
| مصطلحات موضوعية: | Northwest South China Sea, near-bottom and deep-sea ambient noise observation, long-term statistics, monthly variations, wind dependence, Science, General. Including nature conservation, geographical distribution, QH1-199.5 |
| الوصف: | Research on ocean ambient noise is highly important for environment monitoring, marine mammal protection, underwater communication and navigation. In this paper, we present the long-term statistics and wind dependence of near-bottom and deep-sea ambient noise in the northwest South China Sea, at a depth of 1240 m. The data were collected from 11th July 2022 to 31st December 2022 together with local wind speeds ranging from 1 to 58 knots (two typhoons involved), and the processing frequency band is between 20 and 2000 Hz. The long-term mean noise level is calculated along with its skewness, kurtosis and percentile distributions. Diurnal and monthly average of noise levels are analyzed, and the large fluctuations in lower (≤100 Hz) and higher (≥400 Hz) frequencies are respectively caused by the variation of the number of nearby and distant ships and the diverse distributions of the windspeeds in individual months. We find that the noise level in winter (Dec.) is 10~11 dB higher than that in summer (Jul.) at higher frequencies. The probability densities of noise levels in the situation of a fixed wind speed are likely to obey the Burr distributions in low frequencies (50 and 100 Hz) and the Weibull distributions in high frequencies (400 and 1000 Hz). In addition, the mean noise levels for different Beaufort scales match well with the 5-dB-addtion Wenz curves, and a mathematic relationship is acquired between the noise level and wind speed in the experimental site. The results are of great representativeness, and are significant to data-driven noise modelling, evaluation and improvement of sonar performance in the region of South China Sea with an incomplete deep-water sound channel. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2296-7745 |
| Relation: | https://www.frontiersin.org/articles/10.3389/fmars.2023.1341198/full; https://doaj.org/toc/2296-7745 |
| DOI: | 10.3389/fmars.2023.1341198 |
| URL الوصول: | https://doaj.org/article/d5aa5f7bba2c42be95675d749d42aa61 |
| رقم الانضمام: | edsdoj.5aa5f7bba2c42be95675d749d42aa61 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 22967745 |
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| DOI: | 10.3389/fmars.2023.1341198 |