Abstract
When the sensible heat flux is uniform and directed upwards across a field then the air near the ground is warmer in the quiet zone and cooler in the wake zone when compared with conditions in the open. Other scalars show similar behaviour. In conditions of dry air advection, when evaporation in the open exceeds the equilibrium rate, evaporations is reduced in the quiet zone and is expected to be enhanced in the wake zone. Recent work on the aerodynamics of shelter has shown that there exists a quiet zone of reduced turbulence and smaller eddy size immediately behind windbreaks of all porosites. Beyond that, further downwind, lies an extended wake region of increased turbulence with eddy sizes returning to upwind scale. There is evidence to show that turbulent transport of heat, vapour and carbon dioxide is reduced in the quiet zone and enhanced in the wake.
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