Understanding the impact of vegetation on surface roughness length for enhancing wind resource characterization in Iowa

Authors: Andrei Kushkin*, Texas State University
Topics: Energy
Keywords: wind power, alternative energy, surface roughness, vegetation, hub height wind speed, wind resource characterization
Session Type: Paper
Day: 4/6/2019
Start / End Time: 1:10 PM / 2:50 PM
Room: Jackson, Marriott, Mezzanine Level
Presentation File: No File Uploaded


Wind is one of the most promising sources of alternative energy. For efficient use of wind resource potential accurate wind resource assessments are required. Aerodynamic roughness (Z0) is a parameter of surface, widely used for hub height wind speed and thus, available wind resources estimation. This study identifies Z0 coefficients for corn and soybeans and looks at the effect of seasonal crops change on Z0. Wind speed and direction data over a 35-day period above a corn and soybeans fields is used. We calculated hub height wind speed using predefined and observation-based values of Z0. Comparing of the obtained values using independent sample t-test showed significant difference. A growing trend in seasonal surface roughness change was identified. The results highlight the importance of improving aerodynamic roughness parameterization of vegetation. Research suggests that the use of enhanced Z0 coefficients could improve wind resource characterization and would be beneficial for use in wind farm site suitability models.

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