The LIDAR system had collected a large amount of data but was affected by two elements which had to be compensated for:
- The wind speeds up over the island, so the wind speed above the LIDAR is not the same as that over the open sea
- The flow above the LIDAR is non-uniform, which introduces some bias into the measurements.
We were asked to quantify both elements and assess the sensitivity of the conclusions to atmospheric stability. We used computational fluid dynamics (CFD) to simulate the wind over the island, including meshing around the steep cliffs and incorporating atmospheric stability variations into the model. We then assessed the operational performance of the LIDAR unit by calculating the radial velocities that the LIDAR would measure and the way in which it would interpret them, to infer the horizontal wind speed.