Concept
Underwater noise changes
| URI | http://vocab.nerc.ac.uk/collection/M14/current/O3/1/ | ||
|---|---|---|---|
| Within Vocab | OSPAR list of defined pressures on the marine environment | ||
| Alternative Labels | |||
| Definition | Increases over and above background noise levels (consisting of environmental noise (ambient) and incidental manmade/anthropogenic noise (apparent)) at a particular location. Species known to be affected are marine mammals and fish. The theoretical zones of noise influence are temporary or permanent hearing loss, discomfort and injury; response; masking and detection. In extreme cases noise pressures may lead to death. The physical or behavioural effects are dependant on a number of variables, including the sound pressure, loudness, sound exposure level and frequency. High amplitude low and mid-frequency impulsive sounds and low frequency continuous sound are of greatest concern for effects on marine mammals and fish. Some species may be responsive to the associated particle motion rather than the usual concept of noise. Noise propagation can be over large distances (tens of kilometres) but transmission losses can be attributable to factors such as water depth and sea bed topography. Noise levels associated with construction activities, such as pile-driving, are typically significantly greater than operational phases (i.e. shipping, operation of a wind farm). | ||
| Date | 2015-09-11T13:08:17 | ||
| Identifier | SDN:M14::O3 | ||
| Note | accepted | ||
| Is Version Of | O3 | ||
| version | 1 | ||
| Broader | M15:O |
Other physical pressures | |
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