Supervisor: Mark Kelly, DTU Wind Energy
Co-supervisor: Neil Davis, DTU Wind Energy
Examiner: Lars Landberg, DNV GL
The defence is a part of the Online Wind Energy Master
About the Online Wind Energy Master
The part-time master programme is scheduled to take two to four years, making it possible for participants to study while working. The participants come from all over the world and in August, the first participants graduate.
On Friday August 30, 2019, there will be a reception in B118 for the eight graduates.
Abstract: Sensitivity of Wind Resources to Roughness Changes: Application to Real-World Sites
The present thesis studies the sensitivity of wind resource to roughness changes, in terms of speed-up calculated by WAsP in a Monte-Carlo set-up, applied to two near-coastal sites in South Africa. A downloaded online raster roughness map, a hand-drawn map made by a wind engineer and a combination of the online raster map and a hand-drawn coastline were used in the study in three different calculation scenarios.
A brief introduction to the IBL model used by WAsP, Sempreviva’s IBL model with modification, is made, together with an introduction to its sensitivity to the input parameters. It was observed that the increased number of roughness change lines in the online raster map might be influencing the results by introducing ‘noise’ into de the simulation. When compared to the hand-drawn roughness map, much smaller values for speed-up were encountered in the last, suggesting some roughness change lines might be overwhelmed.
The coastline roughness results in the most important roughness change, due to the water’s low roughness value. It could be observed the rougher the background roughness, the most will the flow be affected (slowed down). An analysis of the independent effect of the closest roughness change line was also performed.