Major Assumptions
- Measurements at a point can represent an upwind area
- Measurements are done inside the boundary layer of interest
- Fetch/flux footprint is adequate – fluxes are measured only at area of interest
- Flux is fully turbulent – most of the net vertical transfer is done by eddies
- Terrain is horizontal and uniformed: average of fluctuations is zero; density fluctuations negligible; flow convergence & divergence negligible
- Instruments can detect very small changes at high frequency, ranging from minimum of 5 Hz and to 40 Hz for tower-based measurements
Read more about this topic: Eddy Covariance
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