Abstract
AbstractObservations of neutral flow around an isolated island are presented. the island has a fairly smooth shape with slopes of about 30° and a horizontal section which is roughly elliptical with axis ratio 1.5. the flow field 4 m above the surface shows a speed‐up around the sides and over the summit, with reverse flow on the lee slope. Measurements with an instrumented aircraft, of the mean flow in the wake of the island reveal a single very powerful trailing vortex, with axis close to the upstream wind direction. There are indications that the single vortex was a consequence of the asymmetry caused by the island's elliptical shape. Measurements of fluctuating quantities with a tethered balloon system show marked changes in the components of the turbulence energy in the flow around the side of the hill.
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