Dick Bowdler
Acoustic Consultant
01383 882 644
077 8535 2534
dick@dickbowdler.co.uk
To:
Sandy Millar
Copies:
Date:
Job:
Our Ref:
Pages:
27th January 2015
Linfairn Wind Farm
W319
25 incl Attachments
Sandy,
BACKGROUND NOISE LEVELS
As requested I have looked at the background noise levels measured in 2014 used by the
applicant as a baseline for the noise limits at properties surrounding the proposed wind farm
and in particular at your home, Knockskae. No baseline measurements were made at your
home in 2014.
My first reaction to the measurements is that they are very high compared with similar
measurements in that part of Scotland. I have attached various graphs from other wind farm
applications to this memo to illustrate the point. The first set of graphs is from Assel. It can
be seen that, even in the quiet day periods, the great majority of valid readings at low wind
speeds are below 30dB. Looking at Keirs Hill next (red data are day time and blue are night)
we can see that the levels are not quite as low as Assel but the majority of readings at low
wind speeds is below 30dB. Turning now to Glenmount, with the exception of H1 and H2 the
graphs are similar to Assel and Keirs Hill. As regards H1 and H2, these graphs are similar to
all four sets of graphs at Linfairn – which are also attached for convenience. Noise levels are
flat, similar day and night and between 30 and 40dB – with the Linfairn figures being slightly
higher than Glenmount. The most likely reason for this is that both Glenmount H1 and H2
and all the Linfairn measurements are affected by water noise.
If that is the case that raises a number of questions that are crucial to the assessment
because if it is based on the curves in the application residents near the Linfairn development
could be subject to significantly higher noise levels than those residents near to other wind
farms in the area.
Are the graphs representative of the noise levels at properties at all times of the year?
Are the graphs representative of amenity areas that might be exposed to turbine noise
but not water noise?
Are the graphs representative of other properties in the area that might not have the
same water noise?
As regards the first bullet point the original measurements were made in late August and
early September 2012 and the recent ones in late October and early November 2014. In the
2012 measurements there were many periods when the level was lower than 25dB – mostly
at night but sometimes during the evening. For example on 1st September 2012 the noise
The Haven, Low Causeway, Culross, Fife. KY12 8HN.
Dick Bowdler
Page 2
level at Linfairn between 0230 and 0630 varied between 24.4 and 25.9 with an average of
24.9dBA. On 29th October 2014 it averaged 34.9dB – exactly 10dB higher. I have chosen
these nights because there was very little wind.
Typically, on a night where there is little wind, there is an almost flat continuous noise level
at each of the monitoring locations – as exemplified by this graph.
Background Noise dBA
50
40
30
20
10
0
02:30:03
03:30:03
04:30:03
05:30:03
Time of Day
If we look at some of the nights in the 2014 measurements when there is little wind we find
that the average level between 0230 and 0630 was gradually reducing during the period of
the 2014 measurements. This happened at all locations for example at Tairlaw it reduced
from 37dB to 31dB – 6dB.
So we know that the basic noise level can change by up to 6dB over a period of a few weeks
and we also know that the noise level can be 10dB less than that made in October 2014. The
answer to the first bullet point therefore is clearly therefore NO. The levels in the graphs are
not representative of those at all times.
As regards the second and third bullet points I cannot judge this without seeing and hearing
the sites in detail again.
It is my opinion that the reliability of the baseline measurements is seriously in question and
that the applicant should address this in detail before any decision is made.
Kind regards,
Dick Bowdler
1. Assel
ASSEL VALLEY WIND FARM
SUPPLEMENTARY ENVIRONMENTAL INFORMATION - NOISE
APPENDIX A BACKGROUND NOISE AND NOISE LIMITS
Minuntion - Day-time Periods
(Some Data Excluded)
70
65
60
Noise Level L90 dB(A)
55
50
45
40
35
30
25
20
15
y = -1.5917E-03x3 + 1.6218E-01x2 - 8.1270E-01x + 2.8080E+01
10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Wind Speed at 10 m (m/s)
Figure A1
Chart of background noise levels against wind speeds (open grey circles), the best-fit curve (thin black line)
to these data, the derived noise limit curve (thick black line) for Minuntion during quiet day-time periods.
Predicted immission noise levels are also shown from Breaker Hill (dashed red line), Hadyard Hill (dashed
purple line), the Proposed Development (dashed green line) and the cumulative total (dashed blue line).
Excluded data also shown (open pink circles).
Minuntion - Night-time Periods
(Some Data Excluded)
70
65
60
Noise Level L90 dB(A)
55
50
45
40
35
30
25
20
15
4
3
2
y = -7.6265E-04x + 1.5759E-02x + 9.6020E-02x - 9.8999E-01x + 2.6151E+01
10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Wind Speed at 10 m (m/s)
Figure A2
Chart of background noise levels against wind speeds (open grey circles), the best-fit curve (thin black line)
to these data, the derived noise limit curve (thick black line) for Minuntion during night-time periods.
Predicted immission noise levels are also shown from Breaker Hill (dashed red line), Hadyard Hill (dashed
purple line), the Proposed Development (dashed green line) and the cumulative total (dashed blue line).
Excluded data also shown (open pink circles).
Page 10 of 25
ASSEL VALLEY WIND FARM
SUPPLEMENTARY ENVIRONMENTAL INFORMATION - NOISE
APPENDIX A BACKGROUND NOISE AND NOISE LIMITS
Daldowie - Day-time Periods
(Some Data Excluded)
70
65
60
Noise Level L90 dB(A)
55
50
45
40
35
30
25
20
15
4
3
2
y = -1.7119E-03x + 4.9525E-02x - 3.3761E-01x + 8.7848E-01x + 2.6446E+01
10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Wind Speed at 10 m (m/s)
Figure A3
Chart of background noise levels against wind speeds (open grey circles), the best-fit curve (thin black line)
to these data, the derived noise limit curve (thick black line) for Daldowie during quiet day-time periods.
Predicted immission noise levels are also shown from Breaker Hill (dashed red line), Hadyard Hill (dashed
purple line), the Proposed Development (dashed green line) and the cumulative total (dashed blue line).
Excluded data also shown (open pink circles).
Daldowie - Night-time Periods
(Some Data Excluded)
70
65
60
Noise Level L90 dB(A)
55
50
45
40
35
30
25
20
15
4
3
2
y = -2.6360E-03x + 6.4114E-02x - 2.7090E-01x - 3.8006E-02x + 2.4964E+01
10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Wind Speed at 10 m (m/s)
Figure A4
Chart of background noise levels against wind speeds (open grey circles), the best-fit curve (thin black line)
to these data, the derived noise limit curve (thick black line) for Daldowie during night-time periods.
Predicted immission noise levels are also shown from Breaker Hill (dashed red line), Hadyard Hill (dashed
purple line), the Proposed Development (dashed green line) and the cumulative total (dashed blue line).
Excluded data also shown (open pink circles).
Page 11 of 25
ASSEL VALLEY WIND FARM
SUPPLEMENTARY ENVIRONMENTAL INFORMATION - NOISE
APPENDIX A BACKGROUND NOISE AND NOISE LIMITS
Dalfask - Day-time Periods
(Some Data Excluded)
70
65
60
Noise Level L90 dB(A)
55
50
45
40
35
30
25
20
15
2
y = 1.7155E-01x - 8.3883E-01x + 2.7418E+01
10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Wind Speed at 10 m (m/s)
Figure A5
Chart of background noise levels against wind speeds (open grey circles), the best-fit curve (thin black line)
to these data, the derived noise limit curve (thick black line) for Dalfask during quiet day-time periods.
Predicted immission noise levels are also shown from Breaker Hill (dashed red line), Hadyard Hill (dashed
purple line), the Proposed Development (dashed green line) and the cumulative total (dashed blue line).
Excluded data also shown (open pink circles).
Dalfask - Night-time Periods
(Some Data Excluded)
70
65
60
Noise Level L90 dB(A)
55
50
45
40
35
30
25
20
15
4
3
2
y = -4.2312E-03x + 8.9091E-02x - 3.2895E-01x - 6.1320E-01x + 2.6776E+01
10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Wind Speed at 10 m (m/s)
Figure A6
Chart of background noise levels against wind speeds (open grey circles), the best-fit curve (thin black line)
to these data, the derived noise limit curve (thick black line) for Dalfask during night-time periods. Predicted
immission noise levels are also shown from Breaker Hill (dashed red line), Hadyard Hill (dashed purple
line), the Proposed Development (dashed green line) and the cumulative total (dashed blue line). Excluded
data also shown (open pink circles).
Page 12 of 25
ASSEL VALLEY WIND FARM
SUPPLEMENTARY ENVIRONMENTAL INFORMATION - NOISE
APPENDIX A BACKGROUND NOISE AND NOISE LIMITS
Tormitchell Farm - Day-time Periods
(Some Data Excluded)
70
65
60
Noise Level L90 dB(A)
55
50
45
40
35
30
25
20
15
y = -2.0084E-02x3 + 3.6525E-01x2 + 5.8656E-03x + 2.4298E+01
10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Wind Speed at 10 m (m/s)
Figure A7
Chart of background noise levels against wind speeds (open grey circles), the best-fit curve (thin black line)
to these data, the derived noise limit curve (thick black line) for Tormitchell Farm during quiet day-time
periods. Predicted immission noise levels are also shown from Breaker Hill (dashed red line), Hadyard Hill
(dashed purple line), the Proposed Development (dashed green line) and the cumulative total (dashed blue
line). Excluded data also shown (open pink circles).
Tormitchell Farm - Night-time Periods
(Some Data Excluded)
70
65
60
Noise Level L90 dB(A)
55
50
45
40
35
30
25
20
15
y = -3.0557E-02x3 + 7.1671E-01x2 - 2.7031E+00x + 2.5924E+01
10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Wind Speed at 10 m (m/s)
Figure A8
Chart of background noise levels against wind speeds (open grey circles), the best-fit curve (thin black line)
to these data, the derived noise limit curve (thick black line) for Tormitchell Farm during night-time periods.
Predicted immission noise levels are also shown from Breaker Hill (dashed red line), Hadyard Hill (dashed
purple line), the Proposed Development (dashed green line) and the cumulative total (dashed blue line).
Excluded data also shown (open pink circles).
Page 13 of 25
ASSEL VALLEY WIND FARM
SUPPLEMENTARY ENVIRONMENTAL INFORMATION - NOISE
APPENDIX A BACKGROUND NOISE AND NOISE LIMITS
High Troweir - Day-time Periods
(Some Data Excluded)
70
65
60
Noise Level L90 dB(A)
55
50
45
40
35
30
25
20
15
y = -1.3633E-02x3 + 3.3091E-01x2 - 1.7757E-02x + 2.4322E+01
10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Wind Speed at 10 m (m/s)
Figure A9
Chart of background noise levels against wind speeds (open grey circles), the best-fit curve (thin black line)
to these data, the derived noise limit curve (thick black line) for High Troweir during quiet day-time periods.
Predicted immission noise levels are also shown from Breaker Hill (dashed red line), Hadyard Hill (dashed
purple line), the Proposed Development (dashed green line) and the cumulative total (dashed blue line).
Excluded data also shown (open pink circles).
High Troweir - Night-time Periods
(Some Data Excluded)
70
65
60
Noise Level L90 dB(A)
55
50
45
40
35
30
25
20
15
3
2
y = -1.1491E-02x + 3.4009E-01x - 4.0961E-01x + 2.2410E+01
10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Wind Speed at 10 m (m/s)
Figure A10
Chart of background noise levels against wind speeds (open grey circles), the best-fit curve (thin black line)
to these data, the derived noise limit curve (thick black line) for High Troweir during night-time periods.
Predicted immission noise levels are also shown from Breaker Hill (dashed red line), Hadyard Hill (dashed
purple line), the Proposed Development (dashed green line) and the cumulative total (dashed blue line).
Excluded data also shown (open pink circles).
Page 14 of 25
ASSEL VALLEY WIND FARM
SUPPLEMENTARY ENVIRONMENTAL INFORMATION - NOISE
APPENDIX A BACKGROUND NOISE AND NOISE LIMITS
Tralodden Cottage - Day-time Periods
(Some Data Excluded)
70
65
60
Noise Level L90 dB(A)
55
50
45
40
35
30
25
20
15
3
2
y = -1.4896E-02x + 4.0542E-01x - 1.3265E+00x + 2.6684E+01
10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Wind Speed at 10 m (m/s)
Figure A11
Chart of background noise levels against wind speeds (open grey circles), the best-fit curve (thin black line)
to these data, the derived noise limit curve (thick black line) for Tralodden Cottage during quiet day-time
periods. Predicted immission noise levels are also shown from Breaker Hill (dashed red line), Hadyard Hill
(dashed purple line), the Proposed Development (dashed green line) and the cumulative total (dashed blue
line). Excluded data also shown (open pink circles).
Tralodden Cottage - Night-time Periods
(Some Data Excluded)
70
65
60
Noise Level L90 dB(A)
55
50
45
40
35
30
25
20
15
3
2
y = -1.1885E-02x + 3.5949E-01x - 1.0746E+00x + 2.4521E+01
10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Wind Speed at 10 m (m/s)
Figure A12
Chart of background noise levels against wind speeds (open grey circles), the best-fit curve (thin black line)
to these data, the derived noise limit curve (thick black line) for Tralodden Cottage during night-time
periods. Predicted immission noise levels are also shown from Breaker Hill (dashed red line), Hadyard Hill
(dashed purple line), the Proposed Development (dashed green line) and the cumulative total (dashed blue
line). Excluded data also shown (open pink circles).
Page 15 of 25
2. Keirs Hill
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3. Glenmount
ETSU-R-97 QUIET DAYTIME - Knockdon(H1)
Wind Conditions Quiet
Daytime
10 Minute Windspeed (m/s) Standardised to 10m
12
10
8
6
4
2
0
0
90
North
East
180
South
270
360
West
North
Regression Analysis
Quiet Daytime
10 Minute LA90 Sound Pressure Level (dB)
Wind direction (Degrees)
70
70
60
60
50
50
40
40
30
30
20
20
10
10
y = 34.845 -1.812x +0.408 x2-0.014 x3; R^2 error = 0.792
0
0
0
1
2
3
4
5
6
7
8
9
10 Minute Windspeed (m/s) Standardised to 10m
10
11
12
13
Wind Speed (m/s)
2
3
4
5
6
7
8
9
10
11
971 total data points
22
62
97
150
143
144
129
128
59
16
21
32.7
32.7
33.2
34.2
35.6
37.2
39.1
41.1
43.1
45.1
46.9
Line of best fit (LA90 dB)
12
ETSU-R-97 NIGHT-TIME - Knockdon(H1)
10 Minute Windspeed (m/s) Standardised to 10m
12
10
Wind Conditions
Night-Time
8
6
4
2
0
0
90
180
270
South
East
North
360
North
West
Wind direction (Degrees)
Regression Analysis
Night-Time
10 Minute LA90 Sound Pressure Level (dB)
70
60
50
40
30
20
10
y = 31.897 -0.307x +0.154 x2-0.004 x3; R^2 error = 0.681
0
0
1
2
3
4
5
6
7
8
9
10 Minute Windspeed (m/s) Standardised to 10m
10
11
12
13
Wind Speed (m/s)
2
3
4
5
6
7
8
9
10
11
1002 total data points
57
79
78
139
166
170
119
77
63
32
22
Line of best fit (dB(A))
31.9
32.2
32.9
33.7
34.7
35.8
37.1
38.4
39.9
41.3
42.8
Project
Glenmount Wind Farm
Original Polynomial
Client
RWE Npower Renewables Ltd
Line of best fit(flat lined at low wind speeds for QD)
Title
Wind Conditions&Regression Analysis
Figure Number
5.2
Scale
NTS
Drawn
MC
Checked
NS
Date
18/10/2013
Document Reference
7916-04-N-006
Legend:
12
LA90 10 Minute Measurement Point
Excluded Data-Manual exclusion
Excluded Data-Rain
TNEI Services Limited
Newcastle upon Tyne
Telephone 01912111400
Website
www.tnei.co.uk
ETSU-R-97 QUIET DAYTIME - Waterhead(H2)
Regression Analysis
Quiet Daytime
10 Minute LA90 Sound Pressure Level (dB)
Wind Conditions Quiet
Daytime
10 Minute Windspeed (m/s) Standardised to 10m
12
10
8
6
4
2
0
0
90
North
East
180
270
360
South
West
North
Wind direction (Degrees)
70
70
60
60
50
50
40
40
30
30
20
20
10
10
y = 34.845 -1.812x +0.408 x2-0.014 x3; R^2 error = 0.792
0
0
0
1
2
3
4
5
6
7
8
9
10 Minute Windspeed (m/s) Standardised to 10m
10
11
12
13
Wind Speed (m/s)
2
3
4
5
6
7
8
9
10
11
971 total data points
22
62
97
150
143
144
129
128
59
16
21
32.7
32.7
33.2
34.2
35.6
37.2
39.1
41.1
43.1
45.1
46.9
Line of best fit (LA90 dB)
12
ETSU-R-97 NIGHT-TIME - Waterhead(H2)
10 Minute Windspeed (m/s) Standardised to 10m
12
10
Wind Conditions
Night-Time
8
6
4
2
0
0
90
180
270
South
East
North
360
North
West
Wind direction (Degrees)
Regression Analysis
Night-Time
10 Minute LA90 Sound Pressure Level (dB)
70
60
50
40
30
20
10
y = 31.897 -0.307x +0.154 x2-0.004 x3; R^2 error = 0.681
0
0
1
2
3
4
5
6
7
8
9
10 Minute Windspeed (m/s) Standardised to 10m
10
11
12
13
Wind Speed (m/s)
2
3
4
5
6
7
8
9
10
11
1002 total data points
57
79
78
139
166
170
119
77
63
32
22
Line of best fit (dB(A))
31.9
32.2
32.9
33.7
34.7
35.8
37.1
38.4
39.9
41.3
42.8
Project
Glenmount Wind Farm
Original Polynomial
Client
RWE Npower Renewables Ltd
Line of best fit(flat lined at low wind speeds for QD)
Title
Wind Conditions&Regression Analysis
Figure Number
5.3
Scale
NTS
Drawn
MC
Checked
NS
Date
18/10/2013
Document Reference
7916-04-N-007
Legend:
12
LA90 10 Minute Measurement Point
Excluded Data-Manual exclusion
Excluded Data-Rain
TNEI Services Limited
Newcastle upon Tyne
Telephone 01912111400
Website
www.tnei.co.uk
ETSU-R-97 QUIET DAYTIME - Fishing Lodge(H3)
Regression Analysis
Quiet Daytime
10 Minute LA90 Sound Pressure Level (dB)
Wind Conditions Quiet
Daytime
10 Minute Windspeed (m/s) Standardised to 10m
12
10
8
6
4
2
0
0
90
North
East
180
270
360
South
West
North
Wind direction (Degrees)
70
70
60
60
50
50
40
40
30
30
20
20
10
10
y = 22.414 -1.693x +0.692 x2-0.032 x3; R^2 error = 0.713
0
0
0
1
Wind Speed (m/s)
2
3
4
5
6
7
8
9
10 Minute Windspeed (m/s) Standardised to 10m
10
11
12
13
2
3
4
5
6
7
8
9
10
11
12
949 total data points
113
150
199
138
113
97
79
34
21
5
0
Line of best fit (LA90 dB)
21.5
22.7
24.7
27.3
30.4
33.7
37
40.3
43.2
45.6
-
ETSU-R-97 NIGHT-TIME - Fishing Lodge(H3)
10 Minute Windspeed (m/s) Standardised to 10m
12
10
Wind Conditions
Night-Time
8
6
4
2
0
0
90
180
270
South
East
North
360
North
West
Wind direction (Degrees)
Regression Analysis
Night-Time
10 Minute LA90 Sound Pressure Level (dB)
70
60
50
40
30
20
10
y = 23.702 -3.806x +1.123 x2-0.058 x3; R^2 error = 0.702
0
0
1
Wind Speed (m/s)
2
3
4
5
6
7
8
9
10 Minute Windspeed (m/s) Standardised to 10m
10
11
12
13
2
3
4
5
6
7
8
9
10
11
1032 total data points
181
171
169
174
98
79
62
43
40
10
5
Line of best fit (dB(A))
20.1
20.8
22.8
25.6
28.9
32.3
35.6
38.4
40.3
41
40.2
Project
Glenmount Wind Farm
Original Polynomial
Client
RWE Npower Renewables Ltd
Line of best fit(flat lined at low wind speeds for QD&NT)
Title
Wind Conditions&Regression Analysis
Figure Number
5.4
Scale
NTS
Drawn
MC
Checked
NS
Date
18/10/2013
Document Reference
7916-04-N-008
Legend:
12
LA90 10 Minute Measurement Point
Excluded Data-Manual exclusion
Excluded Data-Rain
TNEI Services Limited
Newcastle upon Tyne
Telephone 01912111400
Website
www.tnei.co.uk
ETSU-R-97 QUIET DAYTIME - Beoch Sheepfold(H4)
Regression Analysis
Quiet Daytime
10 Minute LA90 Sound Pressure Level (dB)
Wind Conditions Quiet
Daytime
10 Minute Windspeed (m/s) Standardised to 10m
12
10
8
6
4
2
0
0
90
North
East
180
270
360
South
West
North
Wind direction (Degrees)
70
70
60
60
50
50
40
40
30
30
20
20
10
10
y = 21.13 +0.731x +0.211 x2-0.008 x3; R^2 error = 0.688
0
0
0
1
2
3
4
5
6
7
8
9
10 Minute Windspeed (m/s) Standardised to 10m
10
11
12
13
Wind Speed (m/s)
2
3
4
5
6
7
8
9
10
11
971 total data points
22
62
97
150
143
144
129
128
59
16
21
23.4
25
26.9
29
31.3
33.7
36.1
38.6
41
43.4
45.6
Line of best fit (LA90 dB)
12
ETSU-R-97 NIGHT-TIME - Beoch Sheepfold(H4)
10 Minute Windspeed (m/s) Standardised to 10m
12
10
Wind Conditions
Night-Time
8
6
4
2
0
0
90
180
270
South
East
North
360
North
West
Wind direction (Degrees)
Regression Analysis
Night-Time
10 Minute LA90 Sound Pressure Level (dB)
70
60
50
40
30
20
10
y = 20.659 +0.362x +0.2 x2-0.007 x3; R^2 error = 0.644
0
0
1
2
3
4
5
6
7
8
9
10 Minute Windspeed (m/s) Standardised to 10m
10
11
12
13
Wind Speed (m/s)
2
3
4
5
6
7
8
9
10
11
1034 total data points
52
73
95
161
170
170
119
77
63
32
22
Line of best fit (dB(A))
22.1
23.4
24.9
26.7
28.6
30.8
33
35.4
37.8
40.2
42.6
Project
Glenmount Wind Farm
Original Polynomial
Client
RWE Npower Renewables Ltd
Line of best fit
Title
Wind Conditions&Regression Analysis
Figure Number
5.5
Scale
NTS
Drawn
MC
Checked
NS
Date
18/10/2013
Document Reference
7916-04-N-009
Legend:
12
LA90 10 Minute Measurement Point
Excluded Data-Manual exclusion
Excluded Data-Rain
TNEI Services Limited
Newcastle upon Tyne
Telephone 01912111400
Website
www.tnei.co.uk
ETSU-R-97 QUIET DAYTIME - Loch Doon Caravan Park(H5)
Regression Analysis
Quiet Daytime
10 Minute LA90 Sound Pressure Level (dB)
Wind Conditions Quiet
Daytime
10 Minute Windspeed (m/s) Standardised to 10m
12
10
8
6
4
2
0
0
90
North
East
180
270
360
South
West
North
Wind direction (Degrees)
70
70
60
60
50
50
40
40
30
30
20
20
10
10
y = 29.161 -1.151x +0.422 x2-0.015 x3; R^2 error = 0.773
0
0
0
1
2
3
4
5
6
7
8
9
10 Minute Windspeed (m/s) Standardised to 10m
10
11
12
13
Wind Speed (m/s)
2
3
4
5
6
7
8
9
10
11
919 total data points
22
58
84
139
127
137
128
128
59
16
21
28.4
29.1
30.4
32.1
34.2
36.7
39.4
42.2
45
47.8
50.5
Line of best fit (LA90 dB)
12
ETSU-R-97 NIGHT-TIME - Loch Doon Caravan Park(H5)
10 Minute Windspeed (m/s) Standardised to 10m
12
10
Wind Conditions
Night-Time
8
6
4
2
0
0
90
180
270
South
East
North
360
North
West
Wind direction (Degrees)
Regression Analysis
Night-Time
10 Minute LA90 Sound Pressure Level (dB)
70
60
50
40
30
20
10
y = 26.101 +0.706x +0.124 x2-0.003 x3; R^2 error = 0.716
0
0
1
2
3
4
5
6
7
8
9
10 Minute Windspeed (m/s) Standardised to 10m
10
11
12
13
Wind Speed (m/s)
2
3
4
5
6
7
8
9
10
11
963 total data points
61
90
87
126
136
152
117
77
63
32
22
Line of best fit (dB(A))
28
29.3
30.7
32.4
34.2
36.1
38.2
40.4
42.7
45
47.4
Project
Glenmount Wind Farm
Original Polynomial
Client
RWE Npower Renewables Ltd
Line of best fit
Title
Wind Conditions&Regression Analysis
Figure Number
5.6
Scale
NTS
Drawn
MC
Checked
NS
Date
18/10/2013
Document Reference
7916-04-N-010
Legend:
12
LA90 10 Minute Measurement Point
Excluded Data-Manual exclusion
Excluded Data-Rain
TNEI Services Limited
Newcastle upon Tyne
Telephone 01912111400
Website
www.tnei.co.uk
4. Linfairn
SgurrEnergy Ltd
Linfairn Wind Farm Addendum Appendix A11: Noise
Appendix 11.2: Background Noise against Wind Speed (Balbeg Cottage)
y = 0.0119x3 - 0.0855x2 + 0.2901x + 35.873
R² = 0.4696
Quiet daytime
60.0
50.0
LA90 [dB]
40.0
30.0
20.0
10.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
Wind Speed at 10m [m/s]
Night-time
y = -0.0041x3 + 0.2328x2 - 1.5459x + 38.071
R² = 0.5532
60.0
50.0
LA90 [dB]
40.0
30.0
20.0
10.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
Wind Speed at 10m [m/s]
14/7048/001/GLA/O/R/001
Revision B1
Certified to ISO 9001, ISO 14001 and OHSAS 18001
Page 6 of 81
SgurrEnergy Ltd
Linfairn Wind Farm Addendum Appendix A11: Noise
Appendix 11.3: Background Noise against Wind Speed (Genoch Cottage)
y = 0.0082x3 - 0.0909x2 + 0.2806x + 36.888
R² = 0.0958
Quiet daytime
60.0
50.0
LA90 [dB]
40.0
30.0
20.0
10.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
Wind Speed at 10m [m/s]
y = -0.0009x3 + 0.12x2 - 0.921x + 38.176
R² = 0.3465
Night-time
60.0
50.0
LA90 [dB]
40.0
30.0
20.0
10.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
Wind Speed at 10m [m/s]
14/7048/001/GLA/O/R/001
Revision B1
Certified to ISO 9001, ISO 14001 and OHSAS 18001
Page 7 of 81
SgurrEnergy Ltd
Linfairn Wind Farm Addendum Appendix A11: Noise
Appendix 11.4: Background Noise against Wind Speed (Linfairn Farm)
y = 0.0016x3 + 0.1447x2 - 1.0873x + 36.344
R² = 0.5342
Quiet daytime
60.0
50.0
LA90 [dB]
40.0
30.0
20.0
10.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
Wind Speed at 10m [m/s]
Night-time
y = -0.0218x3 + 0.6894x2 - 4.8393x + 42.718
R² = 0.6548
60.0
50.0
LA90 [dB]
40.0
30.0
20.0
10.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
Wind Speed at 10m [m/s]
14/7048/001/GLA/O/R/001
Revision B1
Certified to ISO 9001, ISO 14001 and OHSAS 18001
Page 8 of 81
SgurrEnergy Ltd
Linfairn Wind Farm Addendum Appendix A11: Noise
Appendix 11.5: Background Noise against Wind Speed (Tairlaw Farm)
y = 0.0035x3 - 0.022x2 + 0.5696x + 31.66
R² = 0.3717
Quiet daytime
60.0
50.0
LA90 [dB]
40.0
30.0
20.0
10.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
Wind Speed at 10m [m/s]
Night-time
y = 0.0009x3 + 0.0552x2 + 0.023x + 32.755
R² = 0.482
60.0
50.0
LA90 [dB]
40.0
30.0
20.0
10.0
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
Wind Speed at 10m [m/s]
14/7048/001/GLA/O/R/001
Revision B1
Certified to ISO 9001, ISO 14001 and OHSAS 18001
Page 9 of 81