Weather-dependent characterisation of noise immission in the vicinity of wind turbines in topographically structured terrain
LIPS
The locations of wind turbines (WTG) are mostly viewed under simplifying and idealized conditions such as flat terrain without obstacles in the vicinity of the WTG.
However, these situations are rather rare in on-shore reality. Hilly terrain and forests in different forms modify the conditions for the operation. They influence the wind field, i.e. the wind supply, as well as the sound expansion. The daily course of the planetary boundary layer also plays a role. These influences were systematically analyzes in the LIPS project.
Specifically, LIPS dealt with the calculation of the expansion and immission of the sound emitted by wind turbines (WEA) in different atmospheric boundary layer currents over topo-graphically and orographically structured terrain. The core tasks were
- the quantification of the three-dimensional unsteady upstream and downstream flow of wind turbines depending on meteorological and topographical factors,
- the influence of these currents on the sound expansion and sound immission in the neighborhood of wind turbines and
- the validation of the model based on measurement data.
The analyzed topography consisted of forest and forest edges, the orography of two and three-dimensional hills of different heights and widths.
The analyze methods used includes the numerical simulation of the regional and local flow using the WRF model and the flow in the pre and post-run of a wind turbine by means of large-eddy simulation (LES), the simulation of the expansion of the sound emitted by the wind turbine using Euler and Lagrange approaches as well as field measurements of the up-stream and downstream flow with lidar, the measurement of the thermal stability of the boundary layer with a microwave radiometer and sound immission measurements with microphones.
Project type
Research project, third-party funded project
