Environmental Engineering Reference
In-Depth Information
6. Explain the differences between range tests, relational tests, and trend tests. List
a few examples of each.
7. Explain the difference between QC and validation of meteorological data. Why
are they both important?
8. Define the distance constant for an anemometer. How can the distance constant
impact wind speed measurements?
9. Suppose you plot the ratio of wind speeds by direction recorded by two
anemometers from the same level, and the resulting angles where tower shadow
is apparent do not match expectations from the site information. What could be
the problem? What are some methods to determine the source of the problem?
10. Describe in physical terms how atmospheric turbulence can impact the observed
mean wind speed. Why do some anemometers measure greater wind speeds in
high turbulence environments and lower wind speeds in low turbulence envi-
ronments than an IEC Class I sensor? How about prop-vane anemometers?
11. Why is data averaging generally preferred over data substitution? Describe a
scenario where data substitution would be required.
REFERENCES
1. Hale E. Memorandum: NRG #40 transfer function validation and recommendation, AWS
Truewind, 8 Jan 2010.
2. Young M, Babij N. Field measurements comparing the Riso P2546A anemometer to the
NRG #40 anemometer. Global Energy Concepts 2007.
3. IEC 61400-12-1. ed. 1.0. Geneva, Switzerland: IEC. Copyright © 2005.
4. Filippelli MV, et al. Adjustment of anemometer readings for energy production estimates.
In: Proceedings of Windpower 2008, Houston, Texas, USA, June 2008.
5. Tangler J, et al. Measured and predicted rotor performance for the SERI advanced wind
turbine blades. In: Proceedings of Windpower 1991, Palm Springs, California, USA, Feb
1992.
6. Papadopoulos KH, et al. Effects of turbulence and flow inclination on the performance of
cup anemometers in the field. Boundary-Layer Meteorol 2001;101(1):77-107.
SUGGESTIONS FOR FURTHER READING
DeGaetano A. A quality control routine for hourly wind observations. J Atmos Oceanic Technol
1997;14:308-317.
Fiebrich C, Morgan C, McCombs A. Quality assurance procedures for mesoscale meteorological
data. J Atmos Oceanic Technol 2010;27:1565-1582.
Makkonen L, Lehtonen P, Helle L. Anemometry in icing conditions. J Atmos Oceanic Technol
2001;18:1457-1469.
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