A New Method of Estimating Groundwater Evapotranspiration at Sub-Daily Scale Using Water Table Fluctuations

Riparian ecosystems fundamentally depend on groundwater, and accurate estimations of groundwater evapotranspiration (ETG) are important for understanding ecosystem functionality managing regional water resources. Over the past several decades, various methods have been proposed to estimate based table fluctuations. However, majority cannot resolve sub-daily variations in ETG. In this study, we a new hydraulic theory-based ETG estimation method at time scale. To evaluate its performance, employed variety measurements (i.e., levels, latent heat flux soil contents) riparian forest (T. ramosissima) Northwest China from 25 July 10 October 2017. The results indicated that can successfully both (R2 = 0.75) daily 0.88) scales, but specific yield under different conditions should be carefully taken into account. addition, investigated seasonal uptake source plant, found it had strong plasticity usage during study period. That is, consumed approximately equal amounts when moisture was available, tended consume more survival as depleted. verify patterns forest, systematic isotope-based studies needed future study.