Acceptable noise levels
According to the above graph the acceptable noise levels must between those of residential outdoors (which is the lowest) and the industrial outdoors (which is the highest).
According to the above graph the acceptable noise levels must between those of residential outdoors (which is the lowest) and the industrial outdoors (which is the highest).
The following maps can confirm the high levels of noise in the Battersea area because of the existance of the rail tracks. Noise levels during the day are higher, and the specific plot chosen the maximum noise levels are around 55-59 dB. A site with recordings from different noises from the area was also found (http://www.soundsurvey.org.uk/index.php/survey/soundmaps/more/109/35/). It is very interesting because as we can hear, despite the fact that the are seems to be quite quiet (in the acceptable levels of noise), by the time the train passes the noise can be distrubtive.
Does the Power Station provide a barrier to the noise? - General notes about sound barriers
- Inverse square low: the more distance from the source a wave travels the wider the area it is spread (it proportional to the sqaure of the distance.
- However, a doulbing of distance is equivalent to a reduction of 6dB in loudness. (SPL at distance 2r = SPL at distance r - 6)
- A barrier in order to be effective has to be close to the source or close to the listener. If it placed in the middle it will be less effective.
- Attenuation that can result from a barrier can be found using the formula: 10log[2(A+B-d)/w] + 13. Alternatively the following table can be used:
REFERENCES
1] defra, 2006, Noise Mappin England [online] Available at: http://services.defra.gov.uk, [Accessed: 23 November 2013]
2] soundsurvey, 2012, London Sound Survey [online] Available at: http://www.soundsurvey.org.uk/index.php/survey/soundmaps/more/109/35/, [Accessed: 23 November 2013]
3] Alexander D., 2011, Site and Envrironment: Sound [pdf] Cardiff: University of Cardif
4] Alexander D., 2011, Site and Envrironment: Comfort [pdf] Cardiff: University of Cardif
1] defra, 2006, Noise Mappin England [online] Available at: http://services.defra.gov.uk, [Accessed: 23 November 2013]
2] soundsurvey, 2012, London Sound Survey [online] Available at: http://www.soundsurvey.org.uk/index.php/survey/soundmaps/more/109/35/, [Accessed: 23 November 2013]
3] Alexander D., 2011, Site and Envrironment: Sound [pdf] Cardiff: University of Cardif
4] Alexander D., 2011, Site and Envrironment: Comfort [pdf] Cardiff: University of Cardif