scholarly journals Analysis of Ambient Noise Spectrum Level Correlation Characteristics in the China Sea

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 7217-7226
Author(s):  
Jianbo Zhou
Keyword(s):  
Ambient Noise ◽  
Noise Spectrum ◽  
Spectrum Level ◽  
China Sea

Vector Ocean Ambient Noise Spectrum Simulation Based on Parabolic Equation Model in Shallow Water

2017 ◽  
Vol 25 (02) ◽  
pp. 1750034
Author(s):  
Liufang Fu ◽  
Peng Li ◽  
Xinhua Zhang ◽  
Shuqing Ma ◽  
Chengzhi Gao
Keyword(s):  
Parabolic Equation ◽  
South China Sea ◽  
Particle Velocity ◽  
South China ◽  
Ambient Noise ◽  
Sound Pressure ◽  
Noise Spectrum ◽  
China Sea ◽  
Simulation Results ◽  
Horizontal Particle

Ocean ambient noise spectrum is one of the most important characteristics of ambient noise. An ocean vector ambient noise field model was built up based on parabolic equation in this paper. Then the spectra of sound pressure, horizontal particle velocity and vertical particle velocity were calculated applying the model considering noise sources well distributed on the surface with typical summer sound speed profile in South China Sea. The simulation results showed that spectra of sound pressure, horizontal particle velocity and vertical particle velocity were obviously not varied with depth. Then, the simulated results were compared with the experiment results at the receiving depth of a trail in South China Sea in July 2012. Compared with the experimental results, the simulation results are consistent well with the experimental one of sound pressure and horizontal particle velocity in the trend. But the simulation values at low frequency band below 500[Formula: see text]Hz, are not consistent with the experimental one very well, in the band the simulation results are lower than the experimental by about 3–5[Formula: see text]dB. But the simulation result of vertical particle velocity was not consistent with the experimental one, illustrating that the precision of the model might not be enough in the vertical direction.

ANALYSIS OF FLUCTUATIONS IN WIND DEPENDENT SHALLOW WATER AMBIENT NOISE SPECTRUM

2007 ◽  
Vol 07 (03) ◽  
pp. L313-L319 ◽  
Author(s):  
S. RAMJI ◽  
G. LATHA ◽  
S. RAMAKRISHANAN
Keyword(s):  
Shallow Water ◽  
Frequency Band ◽  
Noise Level ◽  
Ambient Noise ◽  
Low Frequency ◽  
Noise Spectrum ◽  
Sea State ◽  
Spectrum Level ◽  
Frequency Bands ◽  
Lower Frequency Band

In this work, the fluctuations in the spectrum level of shallow water ambient noise is analyzed for 3 different sea states. The shallow water ambient noise data were collected of Bay of Bengal using an omni directional hydrophone and a portable data acquisition system.100 sets of data were collected and organized according to the three different sea states using Beaufort scale. Fluctuations in noise spectrum level at different sea states were studied by dividing the spectral bandwidth of 12 kHz into low, mid and high frequency bands. Mean noise spectrum level for each sea state was calculated and the result shows the noise spectrum level increases with the sea state. Further it was found that the noise level was higher in lower frequency band and decreases in the higher frequency band. Also the correlation between the noise level and sea state was higher in the low frequency band and tend to decrease in the mid frequency band and there was no correlation in the higher frequency bands. The higher noise levels were associated with lower frequencies of the bandwidth whereas it is less in higher frequencies. The fluctuations were found to be higher in the lower frequency band than the mid and higher frequency band. In this paper the data collection, data processing and noise spectrum analysis are presented in detail. As the fluctuations in power spectrum level of the ambient noise is one of the primary factor which decides the signal to noise ratio of most of the acoustic instruments, these results seems to be significant.

Spatial variation of ocean ambient noise spectrum in offshore China

2016 ◽  
Vol 140 (4) ◽  
pp. 3351-3351
Author(s):  
Guoli Song ◽  
Xinyi Guo ◽  
Li Ma ◽  
Qianchu Zhang
Keyword(s):  
Spatial Variation ◽  
Ambient Noise ◽  
Noise Spectrum

The ambient noise fluctuation and directionality study in South China Sea

2005 ◽  
Author(s):  
Ruey-Chang Wei ◽  
J.F. Lynch ◽  
A.E. Newhall ◽  
Hsiang-Chih Chan ◽  
Chih-Sheng Liu ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Ambient Noise ◽  
China Sea

Low frequency ambient noise modeling and comparison with field measurements in the South China Sea

2019 ◽  
Vol 148 ◽  
pp. 34-39 ◽  
Author(s):  
JianBo Zhou ◽  
Minhui Zhang ◽  
ShengChun Piao ◽  
Kashif Iqbal ◽  
Ke Qu ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Ambient Noise ◽  
Low Frequency ◽  
Field Measurements ◽  
The South China Sea ◽  
The South ◽  
Noise Modeling ◽  
China Sea
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