Environmental Engineering Reference
In-Depth Information
Reference
Projected
r
2
station
Slope
Intercept
LT speed
A
1.24
2.15
0.90
6.39
B
0.88
0.45
0.89
6.56
C
0.90
0.54
0.89
6.59
D
1.36
2.04
0.89
6.25
E
1.30
1.44
0.88
6.31
F
1.30
0.82
0.83
6.24
G
1.26
1.39
0.76
6.36
H
1.19
1.89
0.62
6.37
I
0.38
2.49
0.61
6.35
J
1.06
2.85
0.47
6.68
station B's reference periods. Then outline the steps and necessary equations to
determine the long-term hub-height speed at your on-site mast.
9. Refer to the trend plot presented below. Suppose all five stations have a good
correlation with your site. For each station labeled A - E, comment on its suit-
ability for long-term climate adjustments and whether or not you would consider
using it.
6
5
4
3
2
AB
C
1
DE
0
1997
1998 1998 2000 2001 2002 2003
Year
2004 2005 2006 2007 2008 2009
10. Discuss the advantages and disadvantages of at least three out of the following
five methods of relating target and reference data sets: (i) ratio of mean speeds;
(ii) linear regression constrained through the origin; (iii) unconstrained linear
regression; (iv) matrix method with binning by direction and speed; and (v)
artificial neural network.
11. Why is it important to avoid reducing the variability of wind speeds when
creating a time series of target data reflecting long-term historical conditions?
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