Measurements of Sound from Wind Turbines
2011 (English)In: Fourth International Meeting on Wind Turbine Noise: Rome Italy 12-14 April 2011, 2011Conference paper (Refereed)
An extensive measurement program, with economical support from the Swedish Energy Agency, have been started up to measure the long-time meteorological effects on sound propagation from wind turbines at three sites in Sweden. The measurements will be performed continuously during 1-2 years. Sound propagation is studied in a 1) forest area, 2) over a water bay and 3) over heterogeneous terrain. The sites are representative for typical Swedish conditions, which are quite common on other geographical locations around the world. The first two of them are located in the southern part of Sweden and the third is located in the northern part of Sweden. The meteorological conditions change over the day and the year and vary a lot depending of the terrain conditions. Variations of the order of 20-25 dBA at the imission point for different weather conditions have been found in earlier investigations. Greatest variations of the immission levels have earlier been found between day and night for sources close to the ground. Variations of the same order have earlier been found during different parts of the year for sound propagation over sea.
The aim of the project is to improve the knowledge about sound propagation from wind turbines and especially over varying terrain and different weather conditions. The hub height of the studied wind turbines varies from 80-138 m and the effect of the source heights on the sound propagation will be investigated. The result shall be improved sound propagation models, updated measuring requirements, validation of modelled sound levels and methods for deriving meteorological input data for a sound propagation model. These measurements will validate the sound propagation model, Nord2000, for varying terrain and weather conditions. The sound propagation model will then be improved according to the long-term measurements. A numerical boundary layer model, MIUU-model, which has been used for mapping the wind energy resources over Sweden, will be used to produce meteorological input data in the sound propagation model. Statistical distribution of the sound level can be calculated for different terrain and weather conditions.
Place, publisher, year, edition, pages
sound, noise, refraction, wind turbine
Engineering and Technology
Research subject Meteorology
IdentifiersURN: urn:nbn:se:uu:diva-165285ISBN: 978-88-88942-33-9OAI: oai:DiVA.org:uu-165285DiVA: diva2:472811
Fourth International Meeting on Wind Turbine Noise, Rome Italy 12-14 April 2011
ProjectsLjud från vindkraftverk, modell-validering-mätning