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Results of initial research – Phase 0

Results of initial research – Phase 0. Eskdalemuir Working Group 16 th Aug 2013. Dr Mark-Paul Buckingham. Introduction. Identification of quietest site at Craig Wind Farm Representative seismic spectra

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Results of initial research – Phase 0

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  1. Results of initial research – Phase 0 Eskdalemuir Working Group 16th Aug 2013 Dr Mark-Paul Buckingham

  2. Introduction • Identification of quietest site at Craig Wind Farm • Representative seismic spectra • Application of Frequency-dependant weighting (FDW) to representative spectra and comparison to 2005 Budget prediction • Factor of over-estimate by 2005 Budget with respect to distance from EKA • Prospect of headroom in the Budget

  3. Sensor selection • Modelled background noise by examining narrow bands between blade-pass frequencies • The quietest sites were: • 6351 / AEG-5 • 6099 / AEG -2b • This correlates with the analysis of Dr Bowers

  4. Representative spectra • Take the spectral interquartile mean of all data with wind speed in the11-12 ms-1 range • Result correlates well with that of Dr Bowers • 6099 / AEG-2b

  5. Representative spectra • Take the spectral interquartile mean of all data with wind speed in the11-12 ms-1 range • Result correlates well with that of Dr Bowers • 6351 / AEG-5

  6. Over-estimate factor • The frequency dependent weighting function (FDW) to representative spectra • FDW contains a distance term, so the over-estimate is distance dependent

  7. Prospect for head-room – 0.336 nm threshold

  8. Conclusions • Results support finding of Dr Bowers, high correlation in results • The 2005 Budget over-estimates the amplitude of seismic ground vibration produced by wind turbines • The over-estimate is depends on the distance from EKA. It varies between: • Over-estimate by a factor of 10 for turbines 10 km from EKA • Over-estimate by a factor of 1.2 for turbines 50 km from EKA • If the turbines at Craig Wind Farm are representative of other turbine in the consultation zone then is a likelihood of significant prospective head room that would allow the building of further wind turbine without breaching the 0.336 nm threshold.

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