9.10 Annex B – Model Validation with Windfarm Measurement Data
187. As part of the environmental impact assessment for East Anglia ONE, a benchmarking exercise was completed to compare the predicted received level outputs, obtained with the NPL implementation of the Weston energy flux model (see Section 9.4 for details), with those measured for foundation B10 at the Belwind Phase 1 windfarm, for which the measurements were reported in Degraer et al. (2010). This location was modelled using the Weston energy flux model and the results are shown for comparison in Table 9.12 below at the ranges for which measurements were reported for Belwind Phase I. The validation modelling was undertaken assuming a hammer energy of 1000kJ (slightly higher than reported) for ranges less than 14,150m and 710kJ for the measurement reported at a range of 14,150m. Ranges less than 2,580m were not modelled as the necessary level of bathymetric data was not available. The predicted levels are slightly higher than the measured values, which is expected, as they were modelled for the highest astronomical tide conditions conducive to better underwater sound propagation in this instance. It is unknown what the tidal state during the time of measurements was, but it is expected that this may have varied during the course of the measurements. There is also some variation expected as the predicated results obtained through propagation modelling assume a straight easterly transect. The actual measurement transect was initially to the east and then deviated to the southeast further out.
Table 9.12. Benchmarking results of Weston Energy Flux model against measurements for Belwind Phase I reported in Degraer et al. (2010).
Measurement Range
2580 m 4000 m 5500 m 7250 m 14150 m
Measured peak SPL (dB re 1 µPa)
174 168 169 165 160
Modelled peak SPL (dB re 1 µPa)
178 174 172 169 161
188. A further model validation example of the implementation of the Weston energy flux model, used in this assessment, is provided in the Environmental Statement for the Hornsea Project One offshore windfarm, where a benchmarking exercise was carried out against measured data obtained during the installation of the meteorological mast in the Hornsea Zone (Smartwind 2013).
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm Appendix 9.1 Underwater Noise Modelling 91
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