| Autor: |
Thomsen, F., Borsani, F., Clarke, D., Jong, C.A.F. de, Witt, P. de, Holtkamp, M., Goethals, F., San Martin, E., Spadaro, P., Raalte, G. van, Jensen, A. |
| Jazyk: |
angličtina |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
3rd International Conference on the Effects of Noise on Aquatic Life, Budapest, Hungary, 11-16 August, 2013 |
| Popis: |
The World Organisation of Dredging Associations (WODA) has identified underwater sound as an environmental issue that needs further consideration. A WODA Expert Group on Underwater Sound (WEGUS) was established to provide a guidance paper on dredging sound, impact on aquatic biota and advice on underwater sound monitoring procedures. The paper recommends following a risk based process as this would result in a more systematic approach to sound impact studies. A critical need is standardization of acoustic terminology and methods and the paper provides suggestions. It is further noted that underwater acoustic models, in combination with measurements provide a pragmatic approach for the assessment of sound distribution. Dredging sounds can be associated with dredging excavation, dredging vessels during transport, and dredged material placement. One or more of four types of dredgers are used: Cutter Suction Dredger, Trailing Suction Hopper Dredger, Grab Dredger, and Backhoe Dredger. Existing data indicate that source levels associated with most dredging processes are generally comparable with those of merchant ships, with the exception of elevated levels of noise generated by gravel extraction. Some cetaceans have been observed avoiding areas of dredging activity on a temporal basis. No information exists about effects of dredging-induced sound on seals or fish. While it is clear that dredging sound has the potential to affect the behavior of aquatic life in some cases, there appears to be minimal risk of injury. Yet, information on impacts are necessary to further identify risks and support informed decisions about the necessity of sound mitigation measures. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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