Water balance

We estimate the water balance by measuring incoming (precipitation) and outgoing water fluxes (stream flow). We might also estimate water loss from evapo-transpiration, which will combine weather station climate (AWS) data with chamber-based carbon flux data (LiCor), which also provide water fluxes from soil and during light measurements over vegetation. Moreover, we have water table depth loggers placed across the landscape to determine accuracy of model predictions and to relate water levels to runoff and evaporation rates.

AWS measuring incoming rainfall

Input versus outflow per catchment (as %loss of rainfall)

Example for 2012: Basically, at the start of the monitoring period (very dry) most of the water stayed within the system (raising the water table), whereas after saturation more than 80% are lost as runoff

Outgoing stream flow weir

Flow rates (Q) measured at catchment outflow weirs

Example for 2012: All three sites with control (C) and treatment (T) are shown. The three sites show remarkably similar flow rate peaks and are similar between the control and treatment areas

A monitoring plot with the water table depth meter (TruTrack)

Plot-scale water table monitoring

Water table depth in 2012 (means of four plots)

Example for 2012: Controls given with STDEV; DN denotes "do nothing" treatment
Note: Whitendale contains one very low WTD control replicate
Andreas Heinemeyer,
May 8, 2020, 6:23 AM