Effects of islands and downslope seafloors on underwater noise in the northern South China Sea during a typhoon

Hongtao Wen; Ning Wang; Yanming Yang; Hailin Ruan; Dewei Xu

doi:10.1007/s13131-020-1566-4

Volume 39 Issue 5

May 2020

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Article Navigation > Acta Oceanologica Sinica > 2020 > 39(5): 87-95

Hongtao Wen, Ning Wang, Yanming Yang, Hailin Ruan, Dewei Xu. Effects of islands and downslope seafloors on underwater noise in the northern South China Sea during a typhoon[J]. Acta Oceanologica Sinica, 2020, 39(5): 87-95. doi: 10.1007/s13131-020-1566-4

Citation:

Hongtao Wen, Ning Wang, Yanming Yang, Hailin Ruan, Dewei Xu. Effects of islands and downslope seafloors on underwater noise in the northern South China Sea during a typhoon[J]. Acta Oceanologica Sinica, 2020, 39(5): 87-95. doi: 10.1007/s13131-020-1566-4

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Effects of islands and downslope seafloors on underwater noise in the northern South China Sea during a typhoon

doi: 10.1007/s13131-020-1566-4

1.
College of Information Science and Technology, Ocean University of China, Qingdao 266100, China
2.
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China

Funds: The National Natural Science Foundation of China under contract No. 41606116; the Natural Science Foundation of Fujian Province of China under contract No. 2016J01019; the National Key R&D Program of China under contract No. 2018YFC1405903.

More Information

Corresponding author: E-mail: yangyanming@tio.org.cn
Received Date: 2019-03-28
Accepted Date: 2019-09-23

Available Online: 2020-12-28

Publish Date: 2020-05-25

Abstract

Abstract

The correlation of ambient noise with wind speed, and the depth dependence of ambient noise are both investigated, where the ocean noise data were recorded by a vertical line array in the northern South China Sea. It is shown that the correlation coefficients increase with increasing hydrophone depth during typhoon periods when the frequency ≥ 250 Hz, which opposes the generally accepted knowledge that the correlation coefficients of noise level and wind speed decrease with increasing depth during non-typhoon periods. Particularly at frequencies of 250 Hz, 315 Hz and 400 Hz, the correlation coefficients increase by more than 0.05 at depths ranging from 155 m to 875 m. At the three frequencies, the average noise levels also increase with increasing depth during typhoon periods. It is suggested that these differences are attributed to the wind-generated noise in shallow waters and the effect of “downslope enhancement” to sound propagation. During typhoon periods, the surf breaking and surf beat upon the shores and reefs are strengthened, and the source levels are increased. The wind-generated noise in shallow waters interacts with the downslope sea floor, with the noise-depth distribution changed by a “downslope enhancement” effect promoting noise propagation.
- underwater noise,
- typhoon,
- downslope enhancement,
- the northern South China Sea

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References(31)

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