Behaviour of the static pressure around a tussock grassland–forest interface

Abstract

A field experiment was executed to measure static pressure differences around a forest edge. So-called ‘Quad-Disks’ were used to measure static pressure unaffected by the dynamic pressure induced by the probe itself. Flow obliquity appeared to have little influence on the results. For a smooth to rough transition, the results showed a maximum pressure difference within the forest at x=0.6 h relative to the probe at x=−4 h, where the height of the forest h=25 m. For a rough to smooth transition the normalised pressure differences were only weak. A maximum pressure difference was found just outside the forest at x=0.6 h relative to the probe at x=4 h probably related to a reattachment point. A negative pressure was present at the probe at x=−4 h.