uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Thermally driven wind modification in coastal areas and its influence on sound propagation with application to wind power
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Air and Water Science. (meteorologi)
2006 (English)Licentiate thesis, monograph (Other scientific)
Abstract [en]

The objective of the current study is to investigate the wind modifications in coastal areas and also to see the impact of atmospheric conditions on long-range sound propagation over sea. This is important when planning where to place wind turbines. Atmospheric measurements (wind, temperature, humidity) were performed in the Baltic Sea area, and a numerical meso-γ-scale atmospheric model (the MIUU-model) was used. The study was performed in early summer when it is common for thermally driven flows e.g. sea breezes and low level jets to evolve, resulting in supergeostrophic winds. The most important parameters for these winds were found to be temperature and roughness differences between land and sea. Even though the wind climatologically increases over sea, a case where the wind decreases when advected out over a cold sea is investigated.

This happens if the stable boundary layer (SBL) over sea is deep enough. Parameters that have a great positive influence on the increase in depth of the SBL are strong thermal winds in combination with large temperature differences between land and sea. With a shallower SBL the wind increases over sea. During one week, the sound level from a siren, placed on a lighthouse in the Baltic Sea, was measured 9.5 km away from the source. This was performed simultaneously with the atmospheric measurements. The influence of atmospheric changes on the sound propagation is studied in details. Higher sound levels are found when low level jets occur and the sound level also seems to be dependent on the height to the jet.

Place, publisher, year, edition, pages
Uppsala: Geotryckeriet , 2006.
Keyword [en]
Wind power, sound propagation, thermally driven, coastal areas, temperature gradient, low level jet
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-86480OAI: oai:DiVA.org:uu-86480DiVA: diva2:117290
Available from: 2007-01-08 Created: 2007-01-08 Last updated: 2010-07-13

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Törnblom, Karin
By organisation
Air and Water Science
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 252 hits
ReferencesLink to record
Permanent link

Direct link