PRESSURE-FLUCTUATIONS DURING COHERENT MOTIONS AND THEIR EFFECTS ON THE BUDGETS OF TURBULENT KINETIC-ENERGY AND MOMENTUM FLUX WITHIN A FOREST CANOPY

Pressure fluctuations associated with coherent motions within a forest canopy at Camp Borden, Canada, are retrieved from tower measurements of velocities and temperatures using the governing equations. The retr ieved pressure fluctuations consist largely of components resulting fr om strong mean wind shear near the top of the canopy and have consiste nt phase relationships with velocities within a coherent structure. Pr essure transport and pressure gradient interaction terms in the budget s of turbulent kinetic energy and momentum flux, estimated using the r etrieved pressure fluctuations, are shown to play a large role in tran sporting turbulent kinetic energy and momentum flux within a forest.