Fig. 1. (a) Topography of the study area using the ETOPO1,[14] and (b) schematic diagram for mooring the SM3M.
Fig. 3. Power spectrogram of noise: (a) ship noise, (b) underwater noise when the ship is not around the hydrophone (the unit of color bar is dB re 1 μPa2/Hz).
Fig. 4. Weather data measured using the weather buoy: (a) wind speed, and (b) wind direction. Here, black dot: wind speed > 2 m/s, red dot: wind speed ≤ 2 m/s.
Fig. 5. Sound speed according to water depth provided by KODC (Korea Oceanographic Data Center).
Fig. 6. Transmission loss for the region (water depth: 3 m) within 100 km from the location where the hydrophone is deployed (water depth: 70 m). Here, the unit of the color bar is dB.
Fig. 7. Comparison between the modeled wind noise level (blue solid line) and the measured wind noise level (red dot) at: (a) 500 Hz, (b) 630 Hz, (c) 800 Hz, and (d) 1 kHz.
Fig. 8. Standard deviation of the measured wind noise level according to the wind speed.
Fig. 2. Underwater noise measured using the hydrophone: (a) power spectrogram (the unit of color bar is dB re 1 μPa2/Hz), and (b) power spectral density at 500 Hz.
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