London Manston Airport Consultative Committee
Average Noise Level Report
November 2002
|
|
Arrival/Departure |
Avg. Lmax dB(A) |
|
|
January 2002 |
A |
94.7 |
|
|
January 2002 |
D |
90.4 |
|
|
February 2002 |
A |
91.9 |
|
|
February 2002 |
D |
91.4 |
|
|
March 2002 |
A |
91.0 |
|
|
March 2002 |
D |
90.1 |
|
|
April 2002 |
A |
90.7 |
|
|
April 2002 |
D |
90.0 |
|
|
May 2002 |
A |
89.7 |
|
|
May 2002 |
D |
89.8 |
|
|
June 2002 |
A |
90.4 |
|
|
June 2002 |
D |
93.2 |
|
|
July 2002 |
A |
91.2 |
|
|
July 2002 |
D |
91.0 |
|
|
August 2002 |
A |
91.6 |
|
|
August 2002 |
D |
92.6 |
|
|
September 2002 |
A |
91.4 |
|
|
September 2002 |
D |
90.4 |
|
|
October 2002 |
A |
90.9 |
|
|
October 2002 |
D |
90.6 |
|
|
November 2002 |
A |
90.2 |
|
|
November 2002 |
D |
90.1 |
|
Background
Since the range of intensity of sound which the human ear can detect is so large, the scale which is used to measure intensity is a scale based on multiples of 10. This type of scale is often referred to as a logarithmic scale. The scale for measuring intensity is the decibel scale. Not all sound pressures are equally loud. This is because the human ear does not respond equally to all frequencies: we are much more sensitive to sounds in the mid frequency than to very low or high frequency sounds. For this reason, noise monitors are usually fitted with a filter whose response to frequency is intended to mimic that of the human ear. If the "A weighting filter" is used – as is the case with the equipment being installed around London Manston Airport - the sound pressure level is given in units of dB(A). Sound pressure level on the dB(A) scale is easy to measure and is therefore widely used. As is common industry practice, the locations of the two noise monitoring sites have been chosen to correspond with the ‘flyover’ reference noise measurement point – approximately 6.5 km from start of take of roll – as described in Annex 16 to the Convention on International Civil Aviation. The noise monitors themselves are configured to identify aircraft related noise ‘events’ by virtue of the characteristics of the flyover eg. duration, rate of rise and fall etc. These events are then correlated to flight movement data. It should be noted that data within this report has been gathered solely at the easterly noise monitor (No. 2) which is sited at Clarendon House Grammar School, Ramsgate. |
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|
Background Since the range of intensity of sound which the human ear can detect is so large, the scale which is used to measure intensity is a scale based on multiples of 10. This type of scale is often referred to as a logarithmic scale. The scale for measuring intensity is the decibel scale. Not all sound pressures are equally loud. This is because the human ear does not respond equally to all frequencies: we are much more sensitive to sounds in the mid frequency than to very low or high frequency sounds. For this reason, noise monitors are usually fitted with a filter whose response to frequency is intended to mimic that of the human ear. If the "A weighting filter" is used – as is the case with the equipment being installed around London Manston Airport - the sound pressure level is given in units of dB(A). Sound pressure level on the dB(A) scale is easy to measure and is therefore widely used. As is common industry practice, the locations of the two noise monitoring sites have been chosen to correspond with the ‘flyover’ reference noise measurement point – approximately 6.5 km from start of take of roll – as described in Annex 16 to the Convention on International Civil Aviation. The noise monitors themselves are configured to identify aircraft related noise ‘events’ by virtue of the characteristics of the flyover eg. duration, rate of rise and fall etc. These events are then correlated to flight movement data. It should be noted that data within this report has been gathered solely at the easterly noise monitor (No. 2) which is sited at Clarendon House Grammar School, Ramsgate. |
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