Forthbank Wind Energy Development - Partnerships for Renewables

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Forthbank Wind Energy Development Table 8.7a Projected Traffic Flows Road Without the proposed wind energy development Annual Average Daily Traffic Flow % Heavy Goods Vehicles With the proposed wind energy development (maximum during construction phase) Annual Average Daily Traffic Flow % Heavy Goods Vehicles A907 (Clackmannan Road) 18236 11 18286 11 Forth Crescent 679 16 729 21 A907 (Gartarry Roundabout) 15007 11 15057 11 Table 8.7b CRTN Predicted Increase In Day-Time Average Traffic Noise Levels (L A10,18hour ) Road Maximum Change in Traffic Noise Level, dB(A) A907 (Clackmannan Road)
Forthbank Wind Energy Development Table 8.8 Nordex N90/2500HS Wind Turbine Sound Power Levels for a 80m hub height WIND SPEED AT 10m HEIGHT (m/s ) SOUND POWER LEVEL (dB L AEQ ) 3 95.0 4 99.0 5 102.5 6 105.5 7 106.5 8 107.0 9 107.0 10 107.0 11 107.0 12 107.0 Table 8.9 Octave Band Sound Power Spectrum (dB L Aeq ) for the Nordex N90/2500HS Operating in Reference Wind Speed Conditions (v10 = 8 m/s) OCTAVE BAND CENTRE FREQUENCY, Hz A-WEIGHTED SOUND POWER LEVEL, dB(A) 63 92.2 125 96.3 250 100.7 500 101.1 1000 99.6 2000 98.5 4000 94.5 8000 87.2 Choice of Wind Farm Operational Noise Propagation Model 8.5.12 Whilst there are several noise propagation models available, here the ISO 9613-2 model 12 has been used to calculate the noise immission levels at the selected nearest residential neighbours. This model has been identified as most appropriate for use in predicting far-field noise radiation from wind turbines in such rural sites. 8.5.13 The model accounts for the attenuation due to geometric spreading, corresponding to the increasing spreading of sound as it propagates away from the source, atmospheric absorption, and ground effects. The model offers the ability to account for barrier effects however, this has not been included for in this assessment due to the relatively flat ground. All attenuation calculations have been made on an octave band basis and therefore account for the sound frequency characteristics of the turbines. The ISO 9613-2 algorithm has been chosen as being the most robust prediction method based on the findings of a joint European Commission research project into wind farm noise propagation over large distances. The title of the research project was ‘Development of a Wind Farm Noise Propagation Prediction Model’ 13 . 8.5.14 Whilst it is impossible to specify exact error bands on noise predictions, the ISO 9613-2 model was found to be the best available both in flat and complex terrain. This model, like all the others, tends to over-estimate the noise at nearby dwellings rather than under-estimate it. The only exception to this finding was the general tendency for the ISO 9613-2 model to over predict the excess attenuation due to screening by ground features. With this limitation applied to the ISO 9613-2 model the over-riding conclusion of the work undertaken as part of the EC research study was that the ISO 9613-2 model tended to predict noise levels which would generally occur under downwind propagation conditions. The probability of non-exceedence of the levels predicted by the ISO 9613-2 model was around 85%. The other important outcome of the research was to clearly demonstrate that under upwind propagation conditions between a given receiver and the wind farm the noise immission level at that receiver will be as much as 10 dB(A) to 1 dB(A) lower than the level predicted using the ISO 9613-2 model. November 2010 Chapter 8 Page 15 Copyright Partnerships for Renewables Development Co. Ltd 2010 ©
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