In recent years, more artificial noise and vibration underwater is being generated by extensive work in fields such as marine development, harbor development and offshore wind farms, as well as by expanded maritime transportation. The impacts on the underwater sound environment and marine wildlife are thus of great concern, with special attention paid to underwater environmental surveys, just as with our atmosphere. With a wide range of practical experience with underwater noise and submarine vibration, INC provides the optimal plan for an accurate survey. Our experience includes:

Underwater noise surveys are conducted by selecting suitable spots, method and equipment according to the characteristics of the target sound source and local conditions

The sound pressure levels for natural background noises differ from those caused by underwater construction, commercial vessels and other artificial noises. Typical examples are given in the following figure. (Levels will vary naturally with meteorological conditions, hydrographic conditions, distance and other factors.)

• ※The standard value of 0 dB is 1 μPa for underwater sound pressure level. Care must be taken when comparing underwater sound pressure levels to air sound pressure levels, where 0 dB is 20 μPa.
• ※Reference: “Sound Environment and Control Technology, Vol, II: Application Technology”

We use appropriate analytical methods accounting for the objectives of survey, characteristics of the target noise and other factors in order to obtain accurate results.